FCC ID: 2ASLJRT500M Scanning Receiver

User Manual RT-500-M RT-500-M Edited by:

RHOTHETA Elektronik GmbH Kemmelpark Dr.-Ingeborg-Haeckel-Str. 2 82418 Murnau Germany Tel.: +49 8841 4879 - 0 Fax: +49 8841 4879 - 15 Internet:

E-Mail:

Copyright RHOTHETA Elektronik GmbH All rights reserved

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- Document-ID: 12-9-1-0002-3-1-64

- Valid for RT-500-M systems with revision [Rev 4.00] or higher www.rhotheta.de email@rhotheta.de Issue: 2019/10/22 [Rev 1.01]

Note The manufacturer reserves the right to make modifications at any time and without previous information of the here described product. RHOTHETA Page 2 of 140 User Manual RT-500-M Content 1 Legend of Signal Words .............................................................................................................. 5 2 Safety ........................................................................................................................................... 5 2.1 General Safety Information ..................................................................................................................... 5 2.2 Basic Safety Instructions ........................................................................................................................ 6 3 Legal Information ........................................................................................................................ 7 3.1 EU Declaration of Conformity ................................................................................................................. 7 3.2 FCC Information (USA)........................................................................................................................... 7 ISED Information (Canada) .................................................................................................................... 7 3.3 4 General Description .................................................................................................................... 8 5 Quick Start ................................................................................................................................... 9 6 Overview .................................................................................................................................... 12 6.1 Front View ............................................................................................................................................. 12 6.2 Rear View ............................................................................................................................................. 14 7 Operation ................................................................................................................................... 16 7.1 Bearing Page ........................................................................................................................................ 17 7.1.1 Bearing Indication .................................................................................................................... 17 7.1.2 Bearing Operation .................................................................................................................... 21 7.1.3 Function Channel 16 ................................................................................................................ 31 7.1.4 Function Repeat ...................................................................................................................... 32 7.1.5 Function Clear.......................................................................................................................... 32 7.1.6 Function Autoset Squelch ........................................................................................................ 33 7.2 Scan Page ............................................................................................................................................ 34 7.2.1 COSPAS-SARSAT Scan ......................................................................................................... 36 7.2.2 Monitoring ................................................................................................................................ 37 7.2.3 Fast Channel Scan .................................................................................................................. 43 7.2.4 Marine Scan ............................................................................................................................. 47 7.2.5 SAR Scan ................................................................................................................................ 51 7.2.6 Scan List .................................................................................................................................. 56 7.3 Decode Page ........................................................................................................................................ 60 7.3.1 Selecting a COSPAS-SARSAT frequency .............................................................................. 62 7.3.2 COSPAS-SARSAT List View ................................................................................................... 62 7.3.3 COSPAS-SARSAT Bearing View ............................................................................................ 63 7.3.4 COSPAS-SARSAT Bearing and List ....................................................................................... 64 7.3.5 Export to Bearing Page ............................................................................................................ 65 7.4 Setup Page ........................................................................................................................................... 66 7.4.1 General .................................................................................................................................... 66 7.4.2 Display ..................................................................................................................................... 74 7.4.3 System ..................................................................................................................................... 82 7.4.4 Interface ................................................................................................................................... 95 7.4.5 Service ................................................................................................................................... 111 7.5 Other Operational Functions .............................................................................................................. 120 7.5.1 Adjusting the Volume ............................................................................................................. 120 7.5.2 Adjusting of the Squelch ........................................................................................................ 121 7.5.3 Dimming ................................................................................................................................. 122 7.5.4 MOB (Man Over Board) Operation ........................................................................................ 124 RHOTHETA Page 3 of 140 User Manual RT-500-M 8 9 Interfaces and Installation ...................................................................................................... 126 8.1 Power & I/O ........................................................................................................................................ 126 8.2 Antenna Unit (Connecting Cable DCU AU ) .................................................................................. 127 8.2.1 Pinning Antenna Unit Connector ........................................................................................... 127 8.2.2 Connecting Cable DCU AU............................................................................................... 127 8.3 NMEA COM-Interfaces ....................................................................................................................... 128 8.4 LAN Interface ...................................................................................................................................... 129 8.5 USB Service Interface ........................................................................................................................ 130 8.6 Ground Connector .............................................................................................................................. 130 8.7 Guideline for Optimal DF Antenna Position ........................................................................................ 131 Technical Data ......................................................................................................................... 132 9.1 Electrical Characteristics .................................................................................................................... 132 9.2 Mechanical Characteristics ................................................................................................................. 134 9.2.1 Mechanical Data .................................................................................................................... 134 9.2.2 DCU Mounting Cutout ............................................................................................................ 135 9.2.3 AU Mast Flange ..................................................................................................................... 135 10 Disposal within the European Union ...................................................................................... 136 11 Disposal outside the European Union ................................................................................... 136 12 Maintenance and Cleaning ..................................................................................................... 137 12.1 Maintenance ....................................................................................................................................... 137 12.2 Cleaning .............................................................................................................................................. 137 13 Appendix .................................................................................................................................. 138 13.1 Error Messages .................................................................................................................................. 138 13.2 Warnings ............................................................................................................................................. 138 13.3 Frequencies of Channels in Marine Band .......................................................................................... 139 13.4 Abbreviations ...................................................................................................................................... 140 14 Notes ........................................................................................................................................ 141 RHOTHETA Page 4 of 140 User Manual RT-500-M 1 Legend of Signal Words Note This symbol designates tips or additional notes that must be paid attention to and make work easier. Caution means that ignoring the instructions may lead to property damage or loss of data. Warning means that ignoring the instructions, there may be a danger to health or life. 2 Safety 2.1 General Safety Information RHOTHETA Elektronik GmbH is constantly trying to keep the safety standard of their products up to date and to offer their customers the highest possible level of safety. RHOTHETA products are designed and tested in accordance with the valid safety regulations. The compliance with these standards is continuously monitored by our quality assurance system. This product is tested and left the factory in perfect technical and safety-relevant condition. To maintain this condition and to ensure safe operation, the user must pay attention to all instructions and warnings given. For any questions regarding these safety instructions, RHOTHETA Elektronik GmbH can be contacted at any time. The observance of the safety instructions will help to prevent personal injury or damage caused by all kinds of dangers. This requires that the following safety instructions must be read carefully and understood before using the product, as well as observed while using the product. Other additional safety instructions, such as for protecting persons, appear in relevant parts of the product documentation and must also be paid attention to. In addition, it is the responsibility of the user to use the product appropriately. The product RT-500-M, a professional VHF direction finder system, shall not be used in any way that results in personal injury or property damage. The use of this product for other than its designated purpose or in disregard of the instructions of the manufacturer is the responsibility of the user. The manufacturer takes no responsibility for the misuse of the product. The manufacturer is not liable beyond the scope of legal rules!

This guide is part of the product RT-500-M and must be kept with the product throughout its lifetime. RHOTHETA Page 5 of 140 User Manual RT-500-M 2.2 Basic Safety Instructions Caution / Warning Read and observe the following instructions, warnings and safety guidelines from the manufacturer!

. At all times, the local or national safety and accident prevention regulations must be observed. When installing or operating with the product, always follow the manufacturer's instructions. Only place the product on appropriate locations. Do not expose the product to environmental conditions (heat, humidity, wind load etc.) that exceed the specified conditions in the manuals. Use only the manufacturers prescribed components and/or use only recommended materials and do not change them. Any other use or unauthorized modifications to the product will void the authorization to operate it. Connect only approved accessories kits or additional equipment. Ensure that the connections with information technology equipment, e.g. industrial computers, comply with the IEC 60950-1/EN 60950-1 standards that applies in each case. This product may only be opened by authorized personnel. The connector must always be disconnected before opening. RHOTHETA Page 6 of 140 User Manual RT-500-M 3 Legal Information 3.1 EU Declaration of Conformity Hereby RHOTHETA Elektronik GmbH declares that the product RT-500-M complies with the essential requirements and other relevant provisions of:

Directive 2014/53/EU relating to radio equipment (relevant for RT-500-M AU) Directive 2014/30/EU relating to electromagnetic compatibility (relevant for RT-500-M DCU) Directive 2014/35/EU relating to the making available on the market of electrical equipment designed for use within certain voltage limits (relevant for RT-500-M DCU) Directive 2011/65/EU on the restriction of the use of certain hazardous substances in electrical and electronic equipment (relevant for RT-500-M AU and RT-500-M DCU) The full text of the Declaration of Conformity can be found at:

https://www.rhotheta.com/products/rt_500_m 3.2 FCC Information (USA) Changes or modifications not expressly approved by the party responsible for compliance

(RHOTHETA) could void the user's authority to operate the equipment. Note This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna. Connect the equipment into an outlet on a circuit different from that to which the receiver is Increase the separation between the equipment and receiver. connected. Consult the dealer or an experienced radio/TV technician for help. 3.3 ISED Information (Canada) This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canadas license-exempt RSS(s). Operation is subject to the following two conditions:

(1) This device may not cause interference.

(2) This device must accept any interference, including interference that may cause undesired operation of the device. A radio license must be obtained prior to possession and use of this scanner receiver. Une licence radio doit tre obtenue avant la possession et lutilisation de ce rcepteur de scanner RHOTHETA Page 7 of 140 User Manual RT-500-M 4 General Description The RT-500-M is a wideband radio direction finder system for professional use in maritime sector. The system operates within a frequency range from 118 to 470 MHz (the whole range can be unlocked to the full extend by using the options F1 F4 listed below). Designed for professional use under extremely rough conditions, the SAR standard version covers the whole VHF marine band and all relevant distress frequencies, such as emergency frequencies 121.5 /

243 MHz, marine channel 16 (156.8 MHz) and all 19 frequencies of the international satellite search and rescue system COSPAS-SARSAT (406 MHz). While locating a COSPAS-SARSAT EPIRB, the direction finder can also decode and display its transmitted information (e.g. Beacon ID and GPS Position). The wide frequency range and frequency steps of 5 kHz allow using the system not only for search and rescue operations but also for detecting illegal vessels operating in a non-standard frequency grid or using PMR (446 MHz) and LPD (433 MHz) radio transmitters. Therefore the system is also widely used by police, coast guards and other maritime law enforcement organisations. The MOB (Man Over Board) surveillance for the crew safety is a standard function of the RT-500-M. The fine frequency steps (5 kHz) allow discovering hidden transmitters in the marine band and in the additional UHF band. RT-500-M Frequency Range Standard Range Optional Extended Range VHF emergency band VHF marine band1 UHF emergency band COSPAS - SARSAT UHF FM band 118.000 124.000 MHz 154.000 163.000 MHz 240.000 246.000 MHz 400.000 406.092 MHz 406.100 410.000 MHz F1: VHF air band F2: extended VHF marine band F3: UHF air band

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F4: additional UHF FM band 118.000 136.992 MHz 137.000 224.995 MHz 225.000 399.975 MHz

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406.100 470.000 MHz Table 1. RT-500-M frequency ranges The DF-system consists of two units: the bearing device AU (antenna unit) and the operating device DCU (display control unit). The antenna unit accommodates all the direction-finding electronics within its housing. Thus, short signal paths with low loss and insensitiveness to external disturbing fields are achieved. The display control unit indicates bearing signals and acts as an instrument for operating and controlling the direction-finding system. External devices can be connected to the DCU, such as an external speaker, a PTT (push-to-talk) switch, etc. It is also possible to input and read data coming from various interfaces, such as external compass data via an NMEA interface. This allows the integration of compass data into the bearing data, which can be indicated on display. 1 Inclusive all maritime channels (ship / coast): channels 00 88 (156,000 162,025 MHz) RHOTHETA Page 8 of 140 User Manual RT-500-M 5 Quick Start 1. Connect the power supply to the DCU. 2. Establish the connection of the AU and the DCU.

(Guideline for Optimal DF Antenna Position can be found under 8.7) Figure 1. General connection schematic 3. Any additional devices like external speaker, compass etc. can be also connected to the DCU. For further information about the installation of the system please refer to chapter 8. 4. Push the ON/OFF button

. 5. When the DCU is turned on, the ON/OFF button lights green and after approximately 20 seconds the bearing page is loaded (s. Figure 2). To turn off the DCU hold the ON/OFF button pressed for about 2-3 seconds. Figure 2. Start page (bearing page) RHOTHETA Page 9 of 140 User Manual RT-500-M 6. Adjust the needed main bearing frequency (the default frequency after first system start is marine channel 16):

o Push the hotkey Freq.Ch. (s. field A, Figure 2). Figure 3. Frequency input dialog o Type the desired frequency into the lower input field New Frequency [MHz] by using the number-keys of the keypad (s. field B, Figure 3) and confirm by pressing OK (s. field C, Figure 3). The system will accept only inputs within the permitted frequency ranges. The adjusted frequency will be shown and monitored on the bearing page once the input is correctly completed. Figure 4. New frequency Input o To input a maritime channel number, push the hotkey Channel (s. field D, Figure 4) and proceed by typing the number and pressing OK. o To select a desired Cospas-Sarsat frequency (channel ABC channel RS) from a drop-down menu press the CP/SS hotkey (s. field E, Figure 4). Confirm the desired frequency with OK. RHOTHETA Page 10 of 140 User Manual RT-500-M 7. Adjust the squelch level:

o Use the arrow keys to increase or decrease the squelch level manually

(the squelch indicator will move up or down in one-percent steps and show the current value). Figure 5. Squelch level adjustment o By pressing the Autoset SQL hotkey the level of the squelch can be automatically adjusted to a suitable value for the current signal level. For more information on the setting of squelch please refer to chapter 7.5.2. After all settings the system operates at the entered frequency. RHOTHETA Page 11 of 140 User Manual RT-500-M 6 Overview 6.1 Front View Front Control Elements Pos. Element Figure 6. DCU front view Function Description Switches the system on/off. When the system is turned on, the key is highlighted in green. In the case of an error the key will blink red. Provides the standby operation to save energy. By pressing this button, the standby is activated, and the button is highlighted in orange. While in standby, the brightness of the displays backlight is driven down to a defined value (configurable in the Setup page, s. 7.4.2.7), but the system continues monitoring the corresponding (emergency) frequency. The display will be turned on again if an event occurs (e.g. signal level rises above squelch level, alarm occurs, scan algorithm finds an active frequency). Pressing the button again will return the system from standby to normal operation mode. The volume adjustment button contains two keys (+ and -). Pressing any of the two keys opens a dialog for adjusting the internal and external speakers (s. 7.5.1). Switches the volume off/on (mute function). The mute-status is indicated by the orange highlight of the button. The volume can be turned on by pressing the same button again. RHOTHETA Page 12 of 140 User Manual RT-500-M

). While the mute function is activated, it is still possible to increase or decrease the volume without producing any sound (using the button for volume adjustment, s. The brightness adjustment button contains two keys (+ and -). Pressing any of the two keys opens the dialog window for brightness adjustment of the TFT-display backlight, LEDs (colored highlighting of buttons legends (s. 7.5.3). The squelch adjustment button contains two keys (+ and -). Pressing any of the two keys opens the dialog window for adjusting of the squelch level. Activates the Man-Over-Board dialog, if GPS data is available (s. 7.5.4). Shows the corresponding data content of the current page or dialog.

) and the white illumination of buttons /

and

, 5 TFT full-color display Sensor of brightness Hotkeys for activating variable functions. The assignment of the keys differs depending on the page or dialog. Measures the ambient brightness to automatically adjust the brightness of the TFT display and the illumination of LEDs and buttons/legends. Returns one step back in a menu or leaves a dialogue or an adjusting field without storing changed parameters. Confirms an input or selection. Leaves a dialogue or an adjusting field and stores changed parameters. By pressing this button, the system returns to the bearing page from any other page or dialog, without storing changed parameters. The arrow keys provide the navigation and selection within the menu or selection field. Furthermore, they allow increasing or decreasing of some values (e.g. squelch level). Numeric keys for direct numeric input. Navigation keys for switching between the pages. Within the Setup page, the navigation keys have different functions due to the large number of possible settings. Table 2. Front control elements RHOTHETA Page 13 of 140 User Manual RT-500-M 6.2 Rear View Interfaces Pos. Element Communication Ports:

COM1 COM2 COM3 AU Screw Cover POWER + IO Figure 7. DCU rear view Function Description NMEA 0183 Bus (RS422 / RS232):

Connection for input of external data, such as compass, GPS, remote control, etc. Connection for output of bearing data, e.g. for map plotter, PC etc. When connecting to input use either RS232 Rx or RS422 Rx (not both)!

For more information s. 8.3. Antenna connector:

Connection between DCU and AU via cable. For more information s. 8.2. Waterproof protection cover for USB connector and replaceable fuses. Opening of the screw cover should be done in a dry room to prevent the ingress of moisture into the interior of the DCU. Source connector:

Connection for power supply Connection for external speaker Connection for self-bearing suppression (SBS / PTT) Connection for audio line out Contacts for alarm relay RHOTHETA Page 14 of 140 User Manual RT-500-M Contacts for squelch out For more information s. 8.1. Ground connector:

Connection of the DCU to the ground of the ship. Thread/screw M5 For more information s. 8.6. LAN connector for network communication For more information s. 8.4. Label with identifying information about the direction finder. LAN Label Speaker Waterproof internal speaker USB

(Only Service) USB 2.0 port:

Used only for service / manufacturing purposes. For more information s. 8.5. Pressure Compensation Element Fuses Equipped with a Gore-Tex membrane, the pressure compensation element prevents over- and underpressure in the DCU. Replaceable fuses:

F1: T3A/127V (Littelfuse 154003.T) F2: T5A/127V (Littelfuse 154005.T) F3: T1A/127V (Littelfuse 154001.T) F4: T0.5A/127V (Littelfuse 154.500T) Note It is recommended to use an additional external fuse: T2A Table 3. Interfaces Warning The voltage supply is not galvanically isolated from the frame. If desired, e.g. in order to prevent current flow to the ground of the vessel, a DC/DC-converter must be adapted. RHOTHETA Page 15 of 140 User Manual RT-500-M Figure 8. Necessity of DC/DC-converter 7 Operation The RT-500-M is operated using the keys placed around the display. In normal bearing mode, the keys call up common functions directly, opening the corresponding dialog window. The basic structure of a DCU Page is as follows:

Figure 9. Basic structure of pages The different pages are listed on the top line of the screen and the active page is highlighted in light blue. Switching between pages is done via the corresponding navigation keys, which are located directly above the page names (s. field A, Figure 9). The top line of the screen is the same for all pages except the Setup page, which contains all the necessary system setup options. The hotkeys differ from page to page to provide page-specific functions or settings. Activate the hotkey function or setting by pressing the corresponding hotkey (s. field B, Figure 9). RHOTHETA Page 16 of 140 User Manual RT-500-M 7.1 Bearing Page The bearing page is the main page of the RT-500-M display unit as it provides the bearing information, settings and status reports at a glance. This page can be opened by pressing the button HOME from any other page or dialog. 7.1.1 Bearing Indication The Bearing page has the following structure (s. Figure 10). Figure 10. Bearing display Indication on Bearing Page Pos. Element Top line Frequency indication Alarms / Errors /

Warnings Meaning / Description Navigation line of the screen, which allows switching between pages

(Bearing, Scan, Decode and Setup). Section for frequency/channel indication during bearing and scanning. The active frequency is displayed in white color. If the scanning function is activated, the currently active frequency (or channel) is displayed in green, and the other frequencies, monitored by the scanning algorithm, are displayed in gray. If the Repeat hotkey (s. also be shown in gray. If there is not enough space to show all frequencies, only a subset of the frequencies around the currently active frequency will be displayed. Section for indicating any faults in the system, alarms and/or warnings

(s. 7.1.2.1).

) is pressed, the old frequency value will RHOTHETA Page 17 of 140 User Manual RT-500-M Frequency /

Channel hotkey Memory hotkey Channel 16 Repeat hotkey Clear hotkey Autoset SQL /

Squelch hotkey Escape button Home button Arrows Up and Down and the OK button Additional data indication Pressing the Feq.Ch. hotkey will activate the frequency/channel input dialog (s. 7.1.2.2). If no input is detected for about 10 seconds, the dialog will be closed automatically. This waiting time can be changed in the System menu of the Setup page (s. 7.4.3.6). Pressing the Memory hotkey will activate the memory dialog (s. 7.1.2.3). The memory dialog provides a list of saved frequencies or channels, which facilitates restoring any frequency from the list to the active bearing mode. Frequencies/channels (max. 8 frequencies) to be scanned in the mode Fast Channel Scan (available only with unlocked option), can be selected in the Memory dialog. Instant access to most common maritime emergency channel (or emergency frequency 121.500 MHz). Calls up last valid bearing, heading and level values. The last bearing clock in the lowermost line of the digital bearing display

(s. Figure 12) shows the time elapsed since the last valid bearing interruption. Mutes the acoustic alarm (if such occurred, s. 7.1.2.1). Clears the last valid bearing. Activates the automatic squelch level adjustment for the active frequency (for further information s. 7.1.6). Pressing this button while a dialog is open, will close the dialog without saving changes. If no dialog is open, pressing this button will go back to the last activated page. The Bearing page is the end-point. Pressing this button on the Bearing page will have no effect when no dialog is open. Monitoring/scanning operation will continue onto the next frequency/channel upon pressing the ESC button, if e.g. currently no data is being received on present frequency. Pressing this button always leads to the Bearing page (home page) from any other page or dialog. If any scan is running, a dialog for leaving the scan will be opened when the Home button is pressed. The squelch level of the main bearing frequency/channel can be adjusted manually by using the arrow buttons (this is only possible if the main frequency is active). If any scan mode is active, pressing one of these buttons will open the squelch dialog (s. 7.5.2). If no dialog is open, the OK- button will not have any effect on the Bearing page. Whereas inside a dialog this button is used to confirm an input and close the dialog. Section for indicating additional data, such as activated or deactivated additional hardware or elapsed time indication for the next awaited Cospas-Sarsat pulse. RHOTHETA Page 18 of 140 User Manual RT-500-M This symbol indicates the time left until the next Cospas-Sarsat pulse. The small bar graph gets filled every second until the next Cospas Sarsat pulse arrives. If after one minute no Cospas-Sarsat pulse arrives, the bar graph will be filled out and show --:-- for the time. This symbol indicates a USB connection. If a USB stick is connected to the DCU, the USB symbol turns green. Otherwise if there is no USB connection available, the symbol stays blue and crossed out. If this symbol is green, then there is valid heading data from an external compass present. If there is no valid heading data available, the symbol stays blue and crossed out. This indicator shows whether there is valid position data from an external GPS available or not. If there is no valid position data available, the symbol stays blue and crossed out. If there is valid position data, the symbol turns green. Current signal level (bar graph):

o Color blue means that the signal level is under the squelch threshold o Color red means that the signal level is above the squelch threshold o The bar graph has a numerical scale, showing the level either in

[%] or in [dBm], which can be selected in the Setup menu. See pictures below. Current squelch level in [%] or [dBm]:

Indication of signal level Indication of squelch level o The squelch level can be set manually. In this case the numerical value is shown inside the indicator. RHOTHETA Page 19 of 140 User Manual RT-500-M o No signal is received (squelch level > signal level). By pressing Autoset SQL (s. above the noise level by a defined value (only once every time this button is pressed). The indicator stays blue with the numerical value inside.

) the squelch level is set o o The signal is received (signal level > squelch level). The option Automatic SQL is selected (no signal received). The option Automatic SQL is selected (signal is received). The squelch level will be held continuously at the best position over the noise. If set to automatic, the indicator turns green and shows an A instead of the numerical value. Digital signal level indication Signal level of active bearing frequency / channel in [%] or [dBm]

(adjustable in the Setup page). Indication of the bearing information:

o Averaged bearing value in degrees as a three-digit number in the middle of the display o Reference of the bearing (True, Magnetic or Relative) o The last bearing clock is shown in the lowermost line of the digital bearing display (s. also Figure 12), if the bearing signal has disappeared. The clock counts the time elapsed since the signal was lost. The indication is in [hh:mm:ss]. o Distance from the current GPS position to the stored GPS Digital bearing display 360 display and compass rose indication Heading pointer position is shown in the uppermost line of the digital bearing display. This information is only indicated, if GPS data is available and at least one GPS arrow is displayed (MOB or Decode mode). If there is more than one GPS arrow, only the distance to the closest coordinates will be shown. The indication is in [km] or [NM], depending on the configuration in the Setup menu or configuration file. If a PTT signal has been detected and PTT is activated for that frequency (Setup page), the letters PTT will be shown instead of the reference direction (e. g. TRUE) and the bearing value

(e. g. 300) will be replaced by ---. o If compass information is available, the graphic display of relative bearing value within the compass rose will be shown. Without compass data the relative bearing will be shown in the 360-

display. If the antenna is mounted correctly, the 0-value corresponds to heading / longitudinal axis of the vessel. Heading direction indicator, which shows a value in [] (here: 30). Heading pointer is fixed in the 12 oclock position and displays the present heading of the ship, if compass information is available. o If the Bearing Reference Direction is set as True bearing (s. Setup page), then the heading direction is shown relatively to the true (geographic) North Pole direction. RHOTHETA Page 20 of 140 User Manual 6755 RT-500-M o o If the Bearing Reference Direction is set as Magnetic bearing, the heading direction is shown relatively to the magnetic North Pole direction. If the Bearing Reference Direction is set as Relative bearing, the heading pointer takes the zero-value (shows in the bow-of-

the-vessel direction, if the antenna is installed correctly). This indication stays constant. The GPS arrow relates to the GPS position. Therefore, this indication is only possible, if GPS data is available. This indication can be activated for two scenarios:

o Pointing to the GPS coordinates that have been stored by pressing the MOB button (red arrow). o Pointing to GPS coordinates that were decoded from Cospas-

Sarsat messages on the Decode page (gray arrow). For more information s. 7.3. The bearing arrow is the graphical indication of the bearing value on the 360 display. The bearing arrow additionally displays the opposite direction on the compass rose. GPS arrow Bearing arrow The bearing value can be indicated (s. also

):

o Relative to the heading of the vessel. This is the case, if no external compass is used. o Relative to the magnetic north pole o Relative to the true (geographical) north pole Spread of bearing Maximum deviation of unaveraged single bearing values. Table 4. Indication on bearing page 7.1.2 Bearing Operation Once the bearing frequency and the squelch level are set, the bearing operation starts. If a signal on the selected operating frequency/channel is received, its level will be indicated digitally in the range of 0% to 99% in the section for signal level indication besides the bar graph, which additionally represents the signal level in a graphical way (s. positions 14 and 16 in Figure 10). The squelch level will then be pictured on the scale of the signal level indication at the manually (or automatically) adjusted value (s. position 15 in Figure 10). The bearing electronics will process data only if the signal level is above the selected squelch level

(= noise suppression). Even without a received signal the DF-system may display a certain signal level (= noise). To avoid distractions from environmental noise signals, the squelch level must be set above the noise level. For the correct setting of the squelch level, please pay attention to chapter 7.5.2. The DF-system detects about 280 bearing values per second. These bearing values might vary significantly, depending on signal quality (signal strength and modulation). This range of spread is indicated as a green arc on the 360 display in front of the bearing arrow (s. position 22 in Figure 10). The smaller the arc, the better the signal quality. If the signal quality deteriorates, the arc becomes larger. The bearing electronics process the detected bearing values over a certain time interval using a sophisticated internal algorithm, which provides a steady and reliable indication of the bearing value

(e.g. the bearing arrow does not react to fast-changing reflections and noise signals). This averaging procedure produces good bearing results, even if there is a wide spread of single bearing values. The bearing arrow represents the relative bearing value. This value is always relative to some fixed point, which could be either heading (the bow-of-the-vessel direction, if the antenna is installed RHOTHETA Page 21 of 140 User Manual RT-500-M correctly) or one of the north pole positions (magnetic or geographic), if compass information is available (via NMEA interface). If using the heading of the ship as the reference direction (no compass data available), the bearing will be shown on top of the 360 display. If using one of the North Pole directions, it will be shown on the 360 display with additional indication of the cardinal points. Distance from the current GPS position to the stored GPS position: 23.45 km (only displayed if GPS data available) Digital indication of bearing value: 300 Figure 11. Digital bearing display

(active signal reception) Reference of the bearing: Magnetic The digital bearing indication is a 3-digit number, rounded to the nearest degree. The reference of bearing is summarized again in the following table (s. Table 5) Bearing reference directions Indication Direction of Reference TRUE True north pole MAGNETIC Magnetic north pole RELATIVE Heading of the vessel Meaning Bearing relative to true (geographic) North. This is the case, if an external compass transmits true heading data (e. g. NMEA sentence xxHDG with valid variation or xxHDT sentence). Bearing relative to magnetic North. This is the case, if an external compass is connected and transmits only magnetic heading (e. g. NMEA sentence xxHDG without valid variation). Bearing relative to the heading of the vessel This is the case, if no external compass is used. Table 5. Bearing reference directions RHOTHETA Page 22 of 140 User Manual RT-500-M If the signal stops being received, the last bearing value will be displayed as a transparent arrow for two seconds (default value). This value is called Bearing Hold Time, and can be changed in Setup

(s. 7.4.2.1). After 2 seconds, the arrow will disappear, and the time elapsed after the last signal reception will be shown inside the digital bearing display as LB (s. Figure 12). Distance from the current GPS position to the stored GPS position

(only displayed, if GPS data available) Digital indication of bearing value and bearing reference of the lost signal Last bearing clock Figure 12. Digital bearing display (signal reception ended 2 seconds ago) It is possible to show the arrow of the last bearing again by pressing the Repeat hotkey (s. position 7 in Figure 10). The arrow will be displayed again for the time period that has been set under Bearing Hold Time in Setup (s. 7.4.2.1). 7.1.2.1 Alarms, Errors, Warnings If during the operation either an emergency signal occurs, or an error is detected, or operating parameters exceed their specified limits, the system will inform the operator by activating an alarm-, error-, or warning-indication. While a signal is being received (signal level > squelch level), it is examined in the background to determine if it is a modulated emergency signal. The emergency signals (ELT = Emergency Locator Transmitter, PLB = Personal Locator Beacon, MOB = Man Over Board) are modulated with a typical repeating and distinct sweeping tone. Once recognized as an emergency signal, the alarm will be activated. In addition to the graphical indication, a special internal warning tone will inform the operator about the reception of the emergency signal. The acoustic alarm will remain activated (even after the signal reception has ended) until confirmed or deactivated (hotkey Clr, s. position 8 in Figure 10). If no emergency signal is received for more than a minute, the alarm will be canceled automatically. Note The alarm relay exit will be activated as well when recognizing an emergency signal. Like the internal warning tone, the relay exit can be deactivated by pressing the hotkey Clr. The alarm relay exit may be used for an external siren, a MOB function, or similar. Alarms/ Errors/ Warnings Indication Example Page Meaning Alarm: An emergency signal has been detected. The source, the counter of the elapsed time since the last alarm, and the related frequency are shown beside the actual alarm indication. The hotkey Clr deactivates the warning signal and the alarm relay output. RHOTHETA Page 23 of 140 User Manual RT-500-M Error: An error message will be displayed if:

o one or more operating parameters are o out of the admitted limits the system has recognized a malfunction

(in this case the system is not working) The hotkey Clr deactivates the acoustic warning. Warning: The system indicates a warning, if:

o external signals are not available o operating parameters are close to the

(anymore) tolerable limits The warning means that the systems basic functions are not affected yet, but it is recommended to check the system in order to prevent damages. Table 6. Alarms, Errors, Warnings 7.1.2.2 Frequency / Channel Input Dialog The frequency input dialog is called up either by pressing the hotkey Freq.Ch. (s. Figure 10, position 4) or using the numeric keys while the Bearing page is active. The frequency input dialog appears in three variants with different input dialogs for:

o Frequencies o Channels o Frequency groups of the Cospas-Sarsat frequencies The confirmed input of the dialog is displayed and stored, so after pressing the Freq.Ch. hotkey again, the dialog opens with the last activated dialog variant (e. g. channel input). If no input is detected for about 10 seconds, the dialog will be closed automatically. This waiting time can be changed in the System menu of the Setup page. Direct input of frequency/channel using the numeric keys works as follows:

o by pressing keys 1, 2, 3 or 4 in the bearing mode (during bearing of any frequency), the frequency input dialog will be opened automatically, taking the pressed number as the first digit of the frequency input. o by pressing number keys 1, 2, 6,7 or 8 in the bearing mode (during bearing of any maritime channel), the channel/ frequency input dialog will be opened automatically, taking the pressed number as the first digit of the channel input. Note The mentioned numbers for the direct input will only work according to the unlocked frequency options of that particular RT-500-M system. List of Elements Element Function Numeric keys for direct input. RHOTHETA Page 24 of 140 User Manual RT-500-M Frequency Channel Ship Coast CP/SS This button deletes all digits in the input dialog for frequencies or channels. In the dialog for selecting Cospas-Sarsat frequencies, the up and down buttons are used to select the desired frequency group. In the dialog for frequency or channel input, these buttons are used to navigate inside the input dialog from one digit to another. Pressing the left arrow will delete the currently marked digit and skip to the next higher digit left of the deleted one. Pressing the right arrow will bring the cursor to the previous position, if the left arrow was pressed. If the input of the frequency (or channel) is complete and valid, pressing this button will adopt the values and close the dialog. In the drop-down menu for selecting Cospas-Sarsat frequencies, pressing this button will select the currently marked frequency group. Pressing this button will close the dialog without adopting values. Pressing this button will close the dialog without adopting the values and open the Bearing Page. Opens the dialog for frequency input inside the frequency input dialog. Opens the dialog for channel input inside the frequency input dialog. This hotkey appears only for duplex channels (s. Figure 14) in the dialog for channel input. It allows selecting the Ship frequency for a duplex channel. This hotkey appears only for duplex channels (s. Figure 14) in the dialog for channel input. It allows the selecting the Coast frequency for a duplex channel. Opens the dialog for selecting Cospas-Sarsat frequency group inside the frequency input dialog. Table 7. Frequency input dialog. List of elements Input of Frequencies The Frequency/channel input dialog is divided into a section for the current frequency and a section for the new frequency. Section Current frequency [MHz] shows the presently activated frequency (s. Figure 13, field 1). Section New Frequency [MHz] allows the input of a new value (s. Figure 13, field 2). RHOTHETA Page 25 of 140 User Manual RT-500-M Figure 13. Input of a new frequency The input of digits is done with the numerical buttons on the front of the device (s. Figure 13, field 9). Note The input of invalid or not licensed frequency values will not be allowed. The currently selected digit is indicated by a green-colored frame. The following actions are possible:

o Pressing the left arrow deletes the currently marked digit and marks the next higher digit left of the deleted one. The right arrow returns to the previous digit position (s. Figure 13, position 7). o The DEL button (s. Figure 13, position 8) deletes the whole input. The input field shows ---.---. o o o Pressing the OK button (s. Figure 13, position 7) adopts the new frequency value and closes the dialog. This is not possible until the input is complete from the first to the last digit. o Pressing the ESC button (s. Figure 13, position 5) closes the dialog without changing the current frequency. If a marine band frequency was entered, and all digits of frequency are valid after the confirmation with OK, the bearing page will automatically show the number of the channel associated with that frequency (besides the indication of the corresponding frequency band). If a Cospas-Sarsat frequency is being entered, the value will be automatically converted to an input in the 8.333 kHz grid. That means, the inputs will be set to the following values:

406.025000 MHz = Channels: A (406.022 MHz), B (406.025 MHz), and C (406.028 MHz) 406.033333 MHz = Channels: D (406.031 MHz), E (406.034 MHz) and F (406.037 MHz) 406.041666 MHz = Channels: G (406.040 MHz) and H (406.043 MHz) 406.050000 MHz = Channels: I (406.046 MHz), J (406.049 MHz) and K (406.052 MHz) 406.058333 MHz = Channels: L (406.055 MHz), M (406.058 MHz) and N (406.061 MHz) 406.066666 MHz = Channels: O (406.064 MHz), P (406.067 MHz) and Q (406.070 MHz) 406.075000 MHz = Channel: R (406.073 MHz) and S (406.076 MHz) RHOTHETA Page 26 of 140 User Manual RT-500-M Input of Channels Generally, channel input works the same way as frequency input: the input dialog is divided into a section for the current channel and a section for the new channel (s. Figure 14, fields 1 and 2). Figure 14. Input of a new channel However, there are two additional hotkeys: Coast and Ship (s. Figure 14, positions 3 and 4), which allow switching between ship- and coast- frequencies in the case of a duplex channel. These hotkeys are only visible if there is a valid input for a duplex channel (e. g. the hotkeys will not be visible for an input 16, as channel 16 is not a duplex channel). For the non-duplex channels, the new channel is entered as a number without any additional input. Switching from channel input dialog to frequency input dialog while entering a channel number will have the following outcomes:

o o If channel input is not completed, the frequency input dialog will show only the current frequency under the Current Frequency [MHz] field (s. Figure 13, field 1). If all digits of channel input are entered and the input is valid, the frequency input dialog will show the new frequency (which belongs to the channel), in the New Frequency [MHz]

Selecting Cospas-Sarsat Frequency Groups The hotkey CP/SS (s. Figure 13, position 4) opens a drop-down menu with selectable Cospas Sarsat frequency groups. The currently active frequency group is highlighted in green, whereas the other groups are gray. By pressing the up and down arrows, a colored frame moves and highlights the frequency group, which can then be selected by pressing OK. Pressing ESC will close the dialog without adopting the new frequency. RHOTHETA Page 27 of 140 User Manual RT-500-M Figure 15. Input of a new COSPAS-SARSAT frequency As a result of the 8.333 kHz grid of the AU, after selecting any channel group, the indication on the Bearing page will be as follows:

o o o o o o o 406.025 MHz for Channel ABC 406.033 MHz for Channel DEF 406.042 MHz for Channel GH 406.050 MHz for Channel IJK 406.058 MHz for Channel LMN 406.067 MHz for Channel OPQ 406.075 MHz for Channel RS 7.1.2.3 Memory Dialog The memory dialog (s. position 5, Figure 10) provides a list of stored frequencies (channels), which facilitates restoring any frequency from memory to the active bearing mode. Selection of the frequencies works by using the up and down arrows. Recalling the marked frequency into the active bearing mode is accomplished by pressing the button OK. Furthermore each frequency can be marked for the function fast channel scan, which means that by activating this function, the marked frequencies will be used for scanning. The fast scanning function itself is limited to a maximum of eight frequencies, so there is also a maximum of eight frequencies which can be marked for scanning in the memory dialog. Inside the memory dialog, the sub-dialogs can be opened, e. g. frequency name editing dialog. RHOTHETA Page 28 of 140 User Manual RT-500-M List of Elements Pos. Element New Freq. Edit Freq. Edit Name Move Up Move Down Scan Yes/No Figure 16. Memory Dialog. Top level Function Creates a new entry at the end of the list. By pressing this hotkey, the Frequency input dialog opens immediately and the new frequency can be entered into the list. Pressing this hotkey opens the Frequency input dialog for changing the currently marked frequency/channel. Pressing this hotkey opens the virtual keyboard, which allows textual input of the name for the currently marked frequency/channel. By pressing this hotkey, the currently marked line will be moved one position upwards in the list. By pressing this hotkey the currently marked line will be moved one position downwards in the list. This hotkey marks the currently selected frequency for the function Fast channel scan. That means, when Fast channel scan is activated, this marked frequency will be scanned as one of the eight possible frequencies for this scan function. If the frequency/channel is already marked for scan and the hotkey Scan Yes/No is pressed once again, the marking for Fast channel scan will be removed. Pressing this button will close the dialog (or frequency / name input) without adopting the new values. RHOTHETA Page 29 of 140 User Manual RT-500-M Pressing this button will close the dialog without adopting the values and open the Bearing page. The up and down arrows are used to select between the stored frequencies in the memory dialog. When editing the name of a frequency, these buttons are used to navigate on the displayed keyboard. The right and left arrows are used to navigate on the displayed keyboard while editing the name of a frequency. Button OK:

o On the top level of the memory dialog pressing OK will activate the currently marked frequency and close the dialog

(previously used frequency on the Bearing page will be deleted). In the sub-dialogs New Freq., Edit Freq. and Edit Name, pressing OK will confirm the edited values (frequency, entered letters or numbers, or the whole input). This button deletes the currently marked frequency from the list. Note Deleting the frequency from the list will follow immediately after pressing the DEL button, without asking for confirmation of the deleting procedure. Pressing the button DEL within the sub-dialogs New Freq., Edit Freq. and Edit Name clears the input field (all digits). The number keys can be used for inputting the frequency name

(s. also

, Edit Name) since the names of frequencies may contain numbers and characters. o Save Pressing the down arrow until the green frame reaches the Save button and confirming with OK will save all previously made modifications within the memory dialog (editing frequencies, names etc.). Once done, the dialog can be closed by pressing ESC, all changes will remain saved. Using the ESC button without previously confirming the changes with Save will close the memory dialog without saving the changes. Table 8. Memory Dialog. List of elements Edit Name Sub-Dialog This dialog is opened from the top level of the Memory dialog by using the corresponding hotkey and allows inputting/editing the name for the marked frequency. This dialog cannot be closed with the button OK because that button is used to confirm each individual character for the text input. The characters are selected by navigating on the virtual keypad using the arrow keys (s. position 3, Figure 17). The dialog is closed by confirming with the button End of User Input on the virtual keyboard. RHOTHETA Page 30 of 140 User Manual RT-500-M Figure 17. Editing the frequency name on the virtual keypad have the same function as shift and caps on a If the frequency name contains numbers, they can be entered using the number keys on the keypad

(s. position 5, Figure 17) since the virtual keyboard itself does not contain number keys. Using the DEL button (s. position 4, Figure 17) the whole input will be deleted. The arrow-keys standard PC keyboard. The up arrow acts as shift (the next input will be interpreted as capital letter, but the following inputs are interpreted as lowercase letters unless this button is pressed again). The down arrow acts as caps (the following inputs will be interpreted as capital letters if the button is not pressed for the second time). The End of User Input is used to confirm the whole text in the input field. By confirming this button with OK, the edit name sub-dialog will be closed, adopting the new name for the frequency which can be seen in the control field above (here: Edit Name of Frequency 121.650 MHz). Pressing the ESC or HOME (s. positions 1 and 2, Figure 17) will close the dialog without adopting the values (and open the bearing page in case of the HOME button). 7.1.3 Function Channel 16 Pressing hotkey Ch. 16 (s. position 6, Figure 10) enables instant access to maritime emergency channel 16. If this function is activated, the hotkey name indication adopts the value of the previously active frequency, so that it can be quickly switched back if needed. Note Please verify correct squelch adjustment. For squelch adjustment see 7.5.2. RHOTHETA Page 31 of 140 User Manual RT-500-M 7.1.4 Function Repeat Pressing the hotkey Repeat (s. position 7, Figure 10) shows the last valid bearing, reference and level values. Numeric bearing indication Bearing reference Last bearing clock Graphical bearing indication Figure 18. Repeat indication The last bearing clock in the lowermost line of the digital bearing display (s. Figure 18) shows the elapsed time since the last valid bearing was interrupted. The last valid bearing data will be shown for 2 seconds (by default) after pressing the Repeat hotkey. This hold time can be changed on the Setup page (Bearing Indication Hold Time, s. 7.4.2.1). If an external compass is activated (true / magnetic bearing), a change in the heading of the ship is automatically considered for the relative bearing. Note If no external compass is activated (relative bearing), the indicated bearing value corresponds to the vessels heading at the time of the bearing. A change of heading in the meantime must be considered. 7.1.5 Function Clear Pressing the hotkey Clr (s. position 8, Figure 10) will clear the last valid bearing together with all the corresponding values. The function Clr clears the internal bearing value averaging memory. The averaging memory improves the bearing accuracy and provides a useful bearing indication even with poorly received signals (e.g. distant transmitter, receiving gaps). The averaging procedure can cause a dragged error, which might affect the bearing value, if the heading changes too fast 1. In this case, the indicated bearing value will slightly lag behind the actual bearing value. Pressing the hotkey Clr after a distinct change of heading will correct the displayed bearing value immediately. If an alarm was activated, this hotkey is used to mute the acoustic alarm (s. 7.1.2.1). 1 Typical case is a quick pass on the transmitter, which is in the near field of the DF-antenna. RHOTHETA Page 32 of 140 User Manual RT-500-M 7.1.6 Function Autoset Squelch In normal bearing mode (no scan active) the hotkey Autoset SQL / Squelch / Automatic / Manual hotkey is designated as Autoset SQL (s. position 9, Figure 10). Pressing this hotkey will automatically set the squelch level above the noise level by 6 dB (this is a default value and can be modified in Setup, s. 7.4.3.11). A manual readjustment might be necessary (s. chapter 7.5.1). When bearing a Cospas-Sarsat frequency this hotkey is designated as Manual/ Automatic, which allows switching between these squelch adjustment possibilities. For further information please refer to chapter 7.5.2. If any scan algorithm is activated, this hotkey is designated with Squelch, or is empty (s. Scan page). Pressing this hotkey will open the squelch dialog to adjust the squelch levels for the different frequencies. RHOTHETA Page 33 of 140 User Manual RT-500-M 7.2 Scan Page The Scan page enables starting scanning modes as simply and quickly as possible. Various scan modes are shown as a list with the currently activated mode highlighted in green. If no scan is currently active, all scan modes in the list are displayed in gray, where the currently marked one is indicated by a green frame. The scan procedures can also be configured on this page. If a scan procedure has been activated, all relevant data of the activated mode will be displayed after switching to the Bearing page. Figure 19 shows the most important elements of the Scan page. Indication on Scan Page Pos. Element Start Scan Stop Scan Excl. On/Off Edit Exclude Figure 19. Scan page. General view Meaning / Description Activates the currently marked scan algorithm. On the Setup page you can set the behavior for when this hotkey is pressed (switching to the Bearing page or remaining on the Scan page, s. 7.4.3.12) Stops the currently activated scanning algorithm, regardless of whether it is marked in the list or not. This hotkey appears only when the Marine Scan or Scan List is marked. By pressing this hotkey, the algorithm of the currently marked scan mode takes the Exclude List into account during the scan. If this setting was already activated for the currently marked scan, pressing this hotkey will deselect this option and the Exclude List will not be regarded during the scan. This hotkey appears only when the Marine Scan or Scan List is marked. RHOTHETA Page 34 of 140 User Manual RT-500-M By pressing this hotkey, the dialog for editing the Exclude List is opened (s. 7.2.4.3). Terminates the currently activated scan algorithm, acquires the frequency which was found during the last scan and switches to the Bearing page. If Scan List is marked, pressing this hotkey opens the corresponding dialog. This hotkey appears only if there is a result for the currently marked scan algorithm. Opens the dialog to edit the currently marked scan algorithm. When there is a dialog opened, pressing this button will close the dialog without adopting new values. When there is no dialog opened, pressing this button will go back to the last activated page. The Bearing Page is the end-point. Pressing this button while on the Scan page will close the Scan page and open the Bearing page (home page). Pressing this button on the Bearing page while any scan procedure is currently active will open a confirmation dialog for ceasing the currently running scan procedure. Confirming with OK terminates the scan operation and the system will change to the normal bearing mode on the previously selected frequency. By pressing the ESC the scan procedure will be continued. If a sub-dialog is opened, pressing this button will close it and lead to the Bearing page, without adopting the changed values. Up and Down arrows are used to select between the general settings (move the green frame). Inside the dialogs (e.g. value editing) they are used to navigate between the characters of the virtual keypad. Right and left arrows have no function on this page. If no scan mode is currently activated, pressing OK will activate the marked scan mode. With the OK button the confirming of values or opening the general settings dialogs is accomplished. If you want to use the frequency determined during the scan as the bearing frequency, press OK. This will quit the scan procedure and start the normal bearing mode on this frequency. If any scan mode is currently activated, by pressing this button the scan mode will be stopped, regardless of whether it is marked in the list or not. Inside the settings dialogs, the DEL button is used to clear the whole input at once Numeric keys are used to enter the numerical characters inside the dialogs. On the top level of the Scan page, they have no function. Go to Result Edit Scan RHOTHETA Page 35 of 140 User Manual RT-500-M Top line Navigation line of the screen, which allows switching between setup menus (General, Display, System, Interface and Service). Table 9. Scan page. List of Elements The last result, which was found during the last scan is displayed with frequency/channel, day and time besides the scan mode (s. Figure 20, field A). This allows the direct opening of a frequency for bearing, which was found in an earlier scan cycle. Figure 20. Cospas-Sarsat scan mode with the last result indication During any scan is active, the field for the day indication shows Running instead of the actual day indication (s. Figure 20, field B). Figure 21. "Exclude List" use indication Further, if the Exclude List is used for a scan algorithm (only for Marine Scan and Scan List available), this will be shown in the table in the second column as Excl (s. Figure 21, field C). 7.2.1 COSPAS-SARSAT Scan In this scan mode, the direction finder keeps scanning the entire COSPAS-SARSAT range of channels

(s. 7.1.2.2, section Input of Frequencies and Selecting Cospas-Sarsat Frequency Groups) until a signal is detected on one of the channel groups (s. Figure 22, field A). Figure 22. Cospas-Sarsat Scan indication on the "Bearing" page After a Cospas-Sarsat frequency has been detected, the scan mode stops automatically and the direction finder changes to the normal bearing mode on this frequency (s. Figure 22, field B). RHOTHETA Page 36 of 140 User Manual RT-500-M o To start the Cospas-Sarsat Scan mode select the corresponding line on the Scan page and press OK or the hotkey Start Scan (s. Figure 23, position 1) Figure 23. "Cospas-Sarsat Scan" mode has been activated o Pressing the hotkey Stop Scan (s. Figure 23, position 2) will terminate the current scan mode and change to the bearing of the frequency, that was set before the scan mode has been activated. Note You can also stop the scan mode by pressing the HOME button on the Bearing page with activated scan. After you have confirmed the special dialog (s. Figure 24), this mode will be terminated. Figure 24. Confirming of leaving the scan mode o Pressing the hotkey Go to Result (s. Figure 23, position 3) during the Cospas-Sarsat scan is currently running, will terminate the scan mode, adopt the frequency which was found in this scan last time and change to the Bearing page. Pressing the hotkey Go to Result if the scan mode is not activated, will lead to the Bearing page with the last result as the activated frequency. This hotkey appears only if there is a result for this scan. 7.2.2 Monitoring The DF-system RT-500-M can receive only one frequency at a given time. For simultaneous surveillance of the emergency frequencies (especially MOB = man over board alert) and any other frequencies/channels, this monitoring function can be used. RHOTHETA Page 37 of 140 User Manual RT-500-M Note The COSPAS-SARSAT frequencies cannot be set as the monitoring frequencies, but they still can be used as the main bearing frequency. Monitoring scan has two different modes of operation that depend on the main bearing frequency:

o Monitoring (normal): the mode of operation with any main frequency that does not belong to the COSPAS-SARSAT band. o Monitoring CP-SS: the mode of operation with a COSPAS-SARSAT frequency as the main frequency. This particular scan mode is convenient for a use case when the expected COSPAS-SARSAT frequency of a particular emergency beacon is not known and should be determined. If the exact COSPAS-SARSAT frequency is known, then using the SAR scan (s. 7.2.5) might be a better choice for simultaneous surveillance of several frequencies. The surveillance of up to five different frequencies (within the specified frequency bands) is possible:

o One main bearing frequency o And four monitoring frequencies:

The emergency frequencies 121.500 MHz and 243.000 MHz are stored permanently in the Monitoring algorithm. Two more frequencies/channels can be set additionally in this scan (s. Figure 25). Designation of the currently active scan mode Main bearing frequency (currently active) Monitoring frequencies Figure 25. Monitoring mode. Indication of frequencies. If the Monitoring (normal) function is activated, the DF system switches alternating from the main bearing frequency to the selected monitoring scanning frequencies (s. 7.2.2.1). The currently monitored frequency is displayed highlighted in green, so you can see, which frequency is active at a given moment (s. Figure 25). A frequency will be monitored for 3 seconds if ELT/PLB is not activated, and 10 seconds if ELT/PLB is activated. If a signal is received during monitoring, the bearing value is indicated on the Bearing page for 30 seconds. o In order to interrupt the current reception, press the ESC button. The system will continue with the next monitoring frequency. Active reception will be interrupted after 30 seconds for a short moment in order to examine the other monitoring frequencies (safety function). This behavior can be changed under Monitoring Settings (s. 7.2.2.4, Edit Scan hotkey-description). If the signal was lost during the monitoring procedure, the scanning process continues with the next frequency/channel after 30 seconds (depending on the settings of the bearing indication time and how many seconds (e.g. of 30 s - period) have already elapsed until the signal was interrupted). RHOTHETA Page 38 of 140 User Manual RT-500-M Monitoring On Active frequency:

Main frequency = Channel 28 Ship Signal has just interrupted Monitoring On Active frequency:

Main frequency = Channel 28 Ship Signal is received Monitoring On Active frequency:

Monitoring frequency = 121.500 MHz Signal is not present Figure 26. Monitoring mode. Example views of the Bearing page o If at some point of scanning procedure the signal on the desired frequency is received, and monitoring of other frequencies is not desired anymore, press the OK button. The frequency, that receives a valid signal at the moment of pressing the OK button, will be adopted as the main frequency, and the system will change to a normal bearing mode. Monitoring On Active frequency:

Main frequency = COSPAS-

SARSAT frequency, which is not known yet. The system performs the COSPAS-SARSAT scan in order to determine the COSPAS-SARSAT sender frequency. Signal is not present. Monitoring On Active frequency:

Monitoring frequency = 121.650 MHz Signal is not present The system recognized a sender on the 406.041 MHz frequency, which is shown in place of the main bearing frequency. Figure 27. Monitoring CP-SS mode. Example views of the Bearing page In the case of COSPAS-SARSAT frequency as the main bearing frequency, the Monitoring CP-SS function is activated automatically, when the Monitoring scan is selected. This operation mode differs from the normal monitoring mode with a non-CP-SS-frequency as the main bearing frequency (s. 7.2.2.2). The CP-SS monitoring procedure will first look for the COSPAS-SARSAT signal and then, if no pulse has been detected for 60 seconds, it will search for other monitoring frequencies one after another

(not alternating with the main frequency as it is in the standard case). RHOTHETA Page 39 of 140 User Manual RT-500-M If a COSPAS-SARSAT signal is detected, the system releases an alarm and decode the pulse, which can then be seen on the Decode page. Note If a valid COSPAS-SARSAT signal is detected during the 60-seconds-period of the monitoring procedure, the correct COSPAS-SARSAT frequency channel of the sender is determined in the first cycle (first 60 seconds period of the CP-SS scan). Only at the second cycle of this scan algorithm the bearing and decoding information of a COSPAS-

SARSAT signal is stored and shown on the corresponding pages. of 7.2.2.1 Timing of Normal Monitoring Operation The main frequency

(here channel 16) is monitored with the highest priority. The duration the monitoring cycles may be extended if signals are received on the monitoring frequencies. Note Receiving on the monitoring frequencies can be triggered by the wrong adjustment of the squelch level!

Please always prove the correctness of the squelch adjustment on the scan frequencies. Figure 28. Example: Timing normal monitoring 7.2.2.2 Timing Monitoring with Selected Cospas-Sarsat Main Frequency If the main frequency is adjusted to a Cospas-Sarsat frequency, the timing cycle will be changed automatically. Additionally, the Cospas-Sarsat-

scanning is activated, in order to catch the short pulse (duration of pulse ca. 400 msec, every 50 seconds). Figure 29. Example: Timing Cospas-Sarsat monitoring 7.2.2.3 Monitoring with Filtering of Emergency Transmitters: ID-Only In order to activate the emergency transmitter filtering function see 7.2.2.4. Signals transmitted by emergency transmitters (PLB/ELT/MOB) are modulated with a typical sweeping tone. In order to exclude false alarms caused by disturbing signals or by not authorized radio-

communication during monitoring mode, the function "emergency transmitter filtering ID-Only" can be activated. Once activated, the alarm for all radio signals without the prescribed sweeping tone for emergency transmitters will be suppressed. Alert will be triggered only if a modulated emergency signal is recognized. Note For very weak signals recognition of modulation may take a certain time. Releasing an alarm can be delayed in this case. RHOTHETA Page 40 of 140 User Manual RT-500-M 7.2.2.4 Monitoring Settings o To start the Monitoring mode select the corresponding line on the Scan page and press OK or the hotkey Start Scan (s. Figure 30, position 1) Figure 30. "Monitoring" has been activated o Pressing the hotkey Stop Scan (s. Figure 30, position 2) will terminate the current scan mode and change to the bearing of the frequency that was set before the scan mode has been activated. o You can also stop the scan mode by pressing the HOME button on the Bearing page with activated scan. After you have confirmed the special dialog (s. Figure 24), this mode will be terminated. Figure 31. Confirming of leaving the scan mode o Pressing the hotkey Go to Result (s. Figure 23, position 3) during the monitoring is currently running, will terminate the scan mode, adopt the frequency which was found in this scan last time and change to the Bearing page. o Pressing the hotkey Go to Result if the scan mode is not activated, will lead to the Bearing page adopting the last result as the bearing frequency. This hotkey appears only if there is a result for this scan. RHOTHETA Page 41 of 140 User Manual RT-500-M o Pressing the hotkey Edit Scan (s. Figure 23, position 4) will open the dialog for changing the monitoring settings (s. Figure 32). Figure 32. Monitoring mode settings o The hotkey Edit Freq. opens the Frequency/Channel input dialog and allows the modification of the currently marked frequency. o Pressing the hotkey Time (def) (s. Figure 32, position 2) will set the hold time (duration of staying in the scanning on this particular frequency) to the default value of 30 seconds. o Pressing the hotkey Edit Time (s. Figure 32, position 3) will open the sub-dialog for changing the hold time to the customized value (s. Figure 33). Use the number keys of the DCU keypad to type the new value in and confirm it with OK. Figure 33. Hold time setting o The hotkey Signal > Sql defines the behavior of the monitoring algorithm to signal level >

squelch level (s. Figure 32, position 4). If this hotkey has been pressed, the scan algorithm will stay on the active frequency until the signal level value becomes higher than the squelch value. o The hotkey Endless (s. Figure 32, position 5) defines the behavior of the monitoring algorithm when an active frequency has been found. If this hotkey is pressed, the monitoring algorithm will stay on an active frequency as long as the user terminates the monitoring mode or skips the actual frequency. o Pressing the hotkey ID only (s. Figure 32, position 6) activates or deactivates the feature ID Only (s. 7.2.2.3):

RHOTHETA Page 42 of 140 User Manual RT-500-M 1. ELT/PLB:

2. :

Alarm is only triggered if an ELT/PLB signature has been detected. Alarm is never triggered, no matter if there is any modulation on it or not. The hotkey ID only is only visible for the following frequencies:

121.500 MHz 243.000 MHz 121.650 MHz 7.2.3 Fast Channel Scan The scan mode fast channel scan is only available with an unlocked option (licensed option F5). Note If the fast channel scan mode is not supported by the connected AU, it cannot be selected in the dialog. 7.2.3.1 Fast Channel Scan Operation In this scan mode, it is possible to scan up to eight freely selectable frequencies/channels across all the specified bands (available frequency bands are visible in the Frequency Information dialog, s. 7.4.1.8). The selection of the 8 frequencies/channels which have to be scanned in the Fast Channel Scan mode, can also be done via Memory dialog, which can be opened by a hotkey on the Bearing page. Note If the fast channel scan is running, the hotkey memory does not react on pressing. Memory dialog is available after the fast channel mode is terminated. The duration of the scan cycle for the maximal number of selectable frequencies is approximately two seconds, whereat all channels are scanned continuously one after another. If less than eight frequencies are selected, the duration of the scanning cycle decreases equivalently to their number

(e.g. if four frequencies/channels are selected, one cycle of the scan procedure takes approximately one second). In fast channel scan mode the auto squelch is set automatically. The behavior of the auto squelch can be slightly influenced by adjusting the SNR value (Signal to Noise Ratio, s. 7.4.3.11). The SNR value indicates the number of level points above the noise level to which the auto squelch is set. For example, if the noise level on a specific channel is at 27% and the SNR value is adjusted to 7, then the auto squelch level is set to 34%. Since the selected frequencies in this mode can have different noise levels and originate from different bands, the SNR value for each frequency/channel can be adjusted separately. After detection of a signal, the bearing is shown for 5 to 7 seconds for frequencies with the activated beep tone detection, additionally, the alarm will be released. For frequencies with deactivated beep tone detection, the active bearing indication time is 30 seconds. After the elapsing of this time, the scan algorithm interrupts the bearing indication and continues with scanning of other selected frequencies. If the signal was lost, one second after the scanning process starts again at the next frequency/channel. RHOTHETA Page 43 of 140 User Manual RT-500-M Fast channel scan = On Active frequency = Ch. 28 Coast Signal is not present. Fast channel scan = On Active frequency = 121.500 MHz Signal is present Figure 34. Fast channel scan indication on the "Bearing" page. In case that an unwanted signal is found, the scanning process can be proceeded immediately by pressing the ESC button. If a signal is found and the direction finder should bear this signal permanently, the scanning process can be ceased either by pressing the button OK (the current frequency will become the new bearing frequency on the Bearing page), or by pressing HOME (in the scan dialog Stop Scan) and then using the Go to result hotkey (s. 7.2.3.3). Note If there are interferences on the frequency band which are above the squelch level, scanning stops as well at these interferences (they are interpreted as signals). This may be avoided by adjusting the squelch level manually adjusting the SNR value. Because of this, it may be possible that weak signals are not received anymore (for correct squelch adjustment read also chapter 7.5.2) 7.2.3.2 Alarm Only Decoding / Beep Tone If the mode fast channel scan is activated, a Beep Tone filter can be activated for each frequency additionally. The alarm is only activated for signals with a distinct (preconfigured) audio frequency and activates an alarm immediately if such a signal was recognized. This can be used to search e.g. NOVATECH radio beacons which transmit a two-second signal with an 800Hz audio tone every six seconds. The parameters of the audio signal (upper and lower audio frequency and the minimum required duration of the signal) can be configured on the Setup page (s. 7.4.3.5). 7.2.3.3 Fast Channel Scan Settings o To start the Fast Channel Scan mode select the corresponding line on the Scan page and press OK or the hotkey Start Scan (s. Figure 35, position 1) RHOTHETA Page 44 of 140 User Manual RT-500-M Figure 35. Activating the Fast Channel Scan o Pressing the hotkey Stop Scan (s. Figure 35, position 2) will terminate the scan mode and change to the bearing of the frequency, that was set before the scan mode has been activated. o You can also stop the scan mode by pressing the HOME button on the Bearing page with activated scan. After you have confirmed the special dialog (s .Figure 36), this mode will be terminated. Figure 36. Confirming of leaving the scan mode o Pressing the button OK during the time of the active reception of the signal, the scanning mode will be deactivated and the current frequency will become the new main frequency. o Pressing the hotkey Go to Result (s. Figure 35, position 3) during the fast channel scan is currently running, will terminate the scan mode, adopt the frequency which was found in this scan last time and change to the Bearing page into normal bearing mode. Pressing the hotkey Go to Result if the scan mode is not activated, will lead to the Bearing page with the last result as the activated frequency. This hotkey appears only if there is a result for this scan. o Pressing the hotkey Edit Scan (s. Figure 35, position 4) will open the dialog for changing the settings of the fast channel scan (s. Figure 37) RHOTHETA Page 45 of 140 User Manual RT-500-M Figure 37. Fast channel scan settings o The hotkey New Freq. opens the Frequency/Channel input dialog for adding the new frequency in the list (maximum 8 frequencies/channels). o The hotkey Edit Freq. opens the Frequency/Channel input dialog and allows the modification of the currently marked frequency. o Pressing the hotkey SNR+ (s. Figure 37, position 3) will increase the SNR value of the o Pressing the hotkey SNR- (s. Figure 37, position 4) will decrease the SNR value of the currently marked frequency by 1%. currently marked frequency by 1%. o Pressing the hotkey Default SNR (s. Figure 37, position 5) will set the SNR value of the currently marked frequency to the default value, which can be defined on the Setup page (s. 7.4.3.11). o Pressing the hotkey ID only (s. Figure 37, position 6) activates or deactivates the feature ID Only with two possible settings:

Beep Tone:

Alarm is only triggered if an audio tone in the valid range (configured via Setup, s. 7.4.3.5) has been detected. Else the bearing is suppressed.

--: Alarm is never triggered no matter if there is any modulation on it or not. Note Beep Tone is only active in Fast Channel Scan. RHOTHETA Page 46 of 140 User Manual RT-500-M 7.2.4 Marine Scan The Marine Scan mode provides a quick scanning of the lower marine band. The frequency range of the Marine Scan is defined from 156.050 MHz (Channel 01) to 157.425 MHz

(Channel 88) and is scanned with 5 kHz frequency steps without gaps. The frequency range cannot be changed. The duration of one scanning cycle is approx. 3 seconds. Designation of the currently active scan mode Scan frequency (changing until a signal is detected) Time of the last signal detection Frequency and the number of the equivalent channel of the last signal detection Figure 38. Marine scan. Indication of frequencies 7.2.4.1 Marine Scan Operation If a signal is found during the scan (signal level above squelch level), the scanning is interrupted and the bearing of the signal is held for 30 seconds (default value, which can be changed in the scan settings, s. 7.2.4.2), then the algorithm continues with scanning of next frequencies . If the button OK is pressed during the time of the active reception of the signal, the scanning mode will be deactivated and the current frequency will become the new main frequency. If the signal was lost during the scan mode, the scanning process continues with the next frequency /

channel after up to 30 seconds (depending on the setting of the bearing indication time, and how many seconds of the indication-time has already elapsed until the signal was interrupted). Marine Scan = On Active frequency = 156.920 MHz Signal is not present. Marine Scan = On Active frequency = 156.500 MHz Signal is present Figure 39. Marine scan indication on the "Bearing" page. RHOTHETA Page 47 of 140 User Manual RT-500-M In case that an unwanted signal is found, the scanning process can be proceeded immediately by pressing the ESC button. Note If there are interferences on the frequency band which are above the squelch level, scanning stops as well at these interferences (they are interpreted as signals). This may be avoided by adjusting the squelch level manually using the Up and Down arrow buttons. Because of this, it might be possible that weak signals are not received anymore (for correct squelch adjustment read also chapter 7.5.2). 7.2.4.2 Marine Scan Settings o To start the Marine Scan mode select the corresponding line on the Scan page and press OK or the hotkey Start Scan (s. Figure 40, position 1). Figure 40. Marine scan is activated. o Pressing the hotkey Stop Scan (s. Figure 40, position 2) will terminate the scan mode and change to the bearing of the frequency, that was set before the scan mode has been activated. o The scanning process can be ceased also by pressing the button HOME. Then the direction finder changes to the bearing of the frequency, which was set before the scan mode was started. o The hotkey Excl. On/Off is only visible, if Marine scan or Scan List is marked (s. Figure 40, position 3). By pressing this hotkey the currently marked scan mode will proceed the Exclude List during the scan. If this setting was already set for the currently marked scan mode, pressing this button will deselect this option and the Exclude List will be ignored during the scan procedure. Edit Exclude is only visible, if Marine scan or Scan List is marked (s. Figure 40, position 4). By pressing this hotkey, the dialog for editing the Exclude List will be opened (s. 7.2.4.3). o o Pressing the hotkey Go to Result (s. Figure 40, position 5) during the marine scan is currently running, will terminate the scan mode, adopt the frequency which was found in this scan last time and change to the Bearing page into normal bearing mode. Pressing the hotkey Go to Result, if the scan mode is not activated, will lead to the Bearing page with the last result as the activated frequency. This hotkey appears only, if there is a result for this scan. o Pressing the hotkey Edit Scan (s. Figure 40, position 6) will open the dialog for changing the settings of the marine scan (s. Figure 41). RHOTHETA Page 48 of 140 User Manual RT-500-M Figure 41. Marine scan settings o Time (def.) hotkey (s. Figure 41, position 1) defines the behavior of the marine scan algorithm if the active frequency (signal level > squelch level) has been found. If this hotkey is pressed, the default time of 30 seconds will be adopted after confirming this setting with OK. Marine scan algorithm will stay for the default time of 30 sec on an active frequency before continuing with scanning of the lower marine band. o Pressing the hotkey Edit Time (s. Figure 41, position 2) will open a dialog for editing the time of staying on the actively received frequency before continuing with the scan procedure. o Pressing the hotkey Signal>Sql. hotkey (s. Figure 41, position 3) defines the time of staying on the actively received frequency before continuing with the scan procedure. If this setting is confirmed, the scanning procedure will stay on the actively received frequency as long as the signal level is higher than the squelch level. If the hotkey Endless (s. Figure 41, position 4) was pressed and confirmed with OK, the marine scan algorithm will stay on the actively received frequency as long as the user terminates the scan or skips the current frequency. o 7.2.4.3 Exclude List (for Marine Scan and Scan List modes) The Exclude List (s. Figure 19, position 4) is a dialog that allows defining single frequencies or frequency ranges that are to be excluded from the scanned frequency ranges for scan modes Scan List and Marine Scan. Due to generating the scan algorithms in the AU (that always run through all the defined frequencies of the mode without the possibility of skipping), in case of signal reception of the Exclude List-

frequency, this frequency will not be completely suppressed but there will be a short bearing indication. After less than one second, the indication interrupts and the marine scan procedure continues immediately with the next frequencies of the defined band. o After pressing the hotkey Edit Exclude on the Scan page (see e.g. Figure 40, position 4), the dialog for editing the Exclude List will be opened. In the case of first opening this dialog, all fields will be empty. RHOTHETA Page 49 of 140 User Manual RT-500-M Figure 42. Exclude List configuration o To insert a new frequency/channel or a range of frequencies/channels, press the hotkey New Freq. (s. Figure 42, position 1). The Frequency Input Dialog will be opened (s. 7.1.2.2), where you can input any desired frequency. In order to define a scope of frequencies from to , it is necessary to input any new frequency first. Then it is possible to proceed with editing of the start- and stop-frequencies. o Mark any line in the list and press the hotkey Edit Start F. (s. Figure 42, position 3) to edit the start-frequency of the desired range to be excluded. The Frequency Input Dialog will be opened (s. 7.1.2.2), where you can input any desired frequency. o Mark any line in the list and press the hotkey Edit Stop F. (s. Figure 42, position 4) to edit the stop-frequency of the desired range to be excluded. The Frequency Input Dialog will be opened (s. 7.1.2.2), where you can input any desired frequency. Note Start- and stop-frequencies must be in the same frequency band (s. Table 1 in chapter 4), as the AU cannot switch from one band to another while running the fast scan algorithms. o By pressing the hotkey Delete Freq. (s. Figure 42, position 2) , the marked line will be deleted immediately, regardless whether it is a single frequency or a whole frequency range. Leaving the dialog by pressing OK, the deleted frequency (or range) will not be excluded from the scanning procedure anymore. RHOTHETA Page 50 of 140 User Manual RT-500-M 7.2.5 SAR Scan The main purpose of the SAR scan is finding COSPAS-SARSAT beacons, which usually transmit a signal on one of the 406-MHz-frequencies and additionally a continuous signal on other emergency frequency (mostly 121.500 MHz). A COSPAS-SARSAT signal is a strong emergency signal (approx. 5W), but its disadvantage is, that it is sent in the form of once-per-minute short pulses. They can be used to determine an activated emergency beacon over major distances. But since the direction of a pulsed signal, received from the great distance, might be influenced by reflections, noise, and distortions, it is still a rough ascertainment of the target. The signals on other emergency frequencies are generally sent out with less power (approx. 100 mW) than the COSPAS-SARSAT pulses, but they are continuous, which allows better bearing performance compared to pulses. The bearing result becomes more precise the closer the direction finder antenna comes to the target. The SAR scan procedure is organized in a way that facilitates the bearing of a COSPAS-SARSAT frequency and using breaks between the COSPAS-SARSAT pulses to observe other emergency frequencies. After a valid COSPAS-SARSAT signal was detected, it is possible either to change to the normal bearing mode on this frequency or stay in the scan mode in order to receive the continuous emergency signal on another emergency frequency after coming closer to the target. The surveillance of up to five different frequencies (within the specified frequency bands) is possible:

o The main frequency is always a COSPAS-SARSAT frequency. It is not possible to set other frequencies as the main frequency. For the case that the exact COSPAS-SARSAT frequency of the emergency beacon is not known, there is a possibility to set All CP/SS in place of the main frequency, which will then trigger the COSPAS-SARSAT scan as the first step of this scan algorithm. After the first COSPAS-SARSAT impulse is detected, the exact COSPAS-SARSAT frequency will be identified automatically and used for the further bearing in this scan mode. o Two next frequencies of this algorithm are always set by default and are not changeable:

1) 121.500 MHz 2) 243.000 MHz o The two remaining frequencies are free selectable. Designation of the currently active scan mode Main bearing frequency (currently active) Scan frequencies Figure 43. SAR scan. Indication of frequencies. If the SAR scan function is activated, the DF system switches alternating from searching of the COSPAS-SARSAT pulse (main bearing frequency) to scanning of the other emergency frequencies using the breaks between the pulses (s. 7.2.5.1). The currently monitored frequency is displayed highlighted in green, so you can see which frequency is active at a given moment (s. Figure 43). If a signal is received during the scan procedure, the bearing value is indicated on the Bearing page. RHOTHETA Page 51 of 140 User Manual RT-500-M o In order to interrupt the current reception, press the ESC button. The system will continue with the next scan frequency. SAR scan On Active frequency:

Main frequency = All CP/SS The system performs the COSPAS-

SARSAT scan in order to determine the COSPAS-SARSAT sender frequency. Signal is not present. SAR scan On Active frequency:

Scan frequency = 243.000 MHz Signal is present The system recognized a sender on the 406.058 MHz frequency, which is shown in place of the main bearing frequency. Figure 44. SAR scan mode. Example views of the Bearing page o If at some point of scanning procedure the signal on the desired frequency is received, and monitoring of other frequencies is not desired anymore, press the OK button. The frequency, that receives a valid signal at the moment of pressing the OK button, will be adopted as the main frequency, and the system will change to a normal bearing mode. 7.2.5.1 Timing of the SAR Scan Operation The SAR scan procedure has slightly different timing in the cases of the unknown COSPAS-SARSAT frequency and the already determined COSPAS-SARSAT frequency after the first reception of the valid pulse. In the case that COSPAS-SARSAT frequency is not known and the setting All CP/SS is set instead of an exact frequency, the system performs the COSPAS-SARSAT scan (s. 7.2.1) first. The duration of this step is always 60 seconds, if the pulse is not detected. After elapsing of 60 seconds the system proceeds with the next frequencies. Figure 45. Example: Timing SAR scan, if no frequency is detected. If during the 60 seconds-cycle a COSPAS-SARSAT pulse is detected, the scan procedure shows the bearing of the main frequency for approx. 3 seconds and then continues with the scan frequencies. So if the pulse is detected at the beginning of the 60 seconds cycle, this cycle shortens down to 3 seconds. RHOTHETA Page 52 of 140 User Manual RT-500-M The scanning time for each scan frequency depends on the number of the selected frequencies (30 sec / N, N = number of frequencies). If the COSPAS-SARSAT pulse is not detected, the total time for scanning of the scan frequencies is 30 seconds, which enables the faster run-through of them. This total time changes to 45 seconds after the first reception of the COSPAS-SARSAT pulse, which enables the efficient scanning of the selected frequencies without missing the next COSPAS-SARSAT pulses. Figure 46. Example: Timing SAR scan, if only COSPAS-SARSAT frequency is detected. If any of the selected emergency frequencies is detected, the scan algorithm will stay on this frequency (releasing the alarm, if this setting is activated under scan settings) until the 45-seconds-

time elapses. Figure 47. Example: Timing SAR scan, if no CP-SS pulse but a signal on an emergency frequency is detected. The algorithm returns back to the scanning of the main COSPAS-SARSAT frequency. RHOTHETA Page 53 of 140 User Manual RT-500-M 7.2.5.2 SAR Scan Settings o To start the SAR scan mode select the corresponding line on the Scan page and press OK or the hotkey Start Scan (s. Figure 48, position 1) Figure 48. Selecting SAR scan o Pressing the hotkey Stop Scan (s. Figure 48, position 2) will terminate the current scan mode and change to the bearing of the frequency, that was set before the scan mode has been activated. o You can stop the scan mode by pressing the HOME while on the Bearing page with activated scan. After you confirm the dialog (s. Figure 49), this mode will be terminated. Figure 49. Confirming of leaving the scan mode o Pressing the hotkey Go to Result (s. Figure 48, position 3) during the scan mode is currently running, will terminate the scan mode, adopt the frequency which was found in this scan last time and change to the Bearing page. Pressing the hotkey Go to Result if the scan mode is not activated, will lead to the Bearing page adopting the last result as the bearing frequency. This hotkey appears only, if there is a result for this scan. o Pressing the hotkey Edit Scan (s. Figure 48, position 4) will open the dialog for changing the SAR scan settings (s. Figure 50) RHOTHETA Page 54 of 140 User Manual RT-500-M Figure 50. SAR scan. Edit scan settings. o The hotkey Edit Freq. is only visible if the COSPAS-SARSAT frequency (top frequency) or one of the free selectable frequencies is marked (s. Figure 51, position A). By pressing this hotkey the frequency input dialog will open. Figure 51. Alternating hotkeys o The hotkey Edit Freq. opens the Frequency/Channel input dialog and allows the modification of the currently marked frequency. This hotkey only appears for the frequencies that are configurable (the last two displayed frequencies: Channel 28 Ship and Channel 68, s. Figure 50). o The hotkey All CP/SS is only visible if the COSPAS-SARSAT frequency is marked (s. Figure 51, position B). By pressing this hotkey a COSPAS-SARSAT scan will be started in order to find an active COSPAS-SARSAT frequency during SAR scan algorithm. o Pressing the hotkey Time (def) (s. Figure 50, position 1) will set the hold time (duration of staying in the scanning on this particular frequency) to the value that is given by the CP-SS setting (30/N or 45/N), s. 7.2.5.1. o The hotkey Signal>Sql defines the behavior of the scan algorithm to signal level > squelch level (s. Figure 50, position 2). If this hotkey is pressed, the scan algorithm will stay on the active frequency until the signal level value becomes higher than the squelch value. o The hotkey Endless (s. Figure 50, position 3) defines the behavior of the scan algorithm when an active frequency has been found. RHOTHETA Page 55 of 140 User Manual RT-500-M If this hotkey is pressed, the scan algorithm will stay on an active frequency as long as the user terminates the scan mode or skips the actual frequency. o Pressing the hotkey ID only (s. Figure 50, position 4) activates or deactivates the feature ID Only (s. 7.2.2.3):

3. ELT/PLB:

Alarm is only triggered if an ELT/PLB signature has been detected. Else the bearing is suppressed. 4. :

Alarm is never triggered no matter if there is any modulation on it or not. The hotkey ID only is only visible for the following frequencies:

121.5 MHz. 243 MHz. 7.2.6 Scan List The function Scan List provides a comfortable scanning feature of different frequency bands in one scan procedure. The scan algorithm in the full scan list mode compares Search List (accessible over Edit Scan) and Exclude List (s. 7.2.4.3) and out of this comparison it generates an internal list of frequencies which will be scanned. All results (received signals) are saved in a Result List. Note The Start and the Stop frequencies of one scan section to be entered (either in the search- or in the scan-list) have to lie inside one frequency band (s. Table 1 in chapter 4). Designation of the currently active scan mode Scan frequency (changing until a signal is detected) Frequency and time of the last signal detection Figure 52. Scan List. Indication of frequencies. Note When restarting the Scan List mode, there is a possibility to scan the full-range-procedure that is given by comparison of search and exclude lists, or to scan only the result list. The scan algorithm in the Result List mode starts the scan procedure, which runs only around the searched frequencies (last results). If the gap between the two frequencies is too large, the scan procedure will slightly slow down. The actual scan operation works the same way as the scanning operation of Marine Scan (s. 7.2.4.1). RHOTHETA Page 56 of 140 User Manual RT-500-M o To start the Scan List mode select the corresponding line on the Scan page and press OK or the hotkey Start Scan (s. Figure 53, position 1). Figure 53. "Scan List" is activated. o Pressing the hotkey Stop Scan (s. Figure 53, position 2) will terminate the scan mode and change to the bearing of the frequency, that was set before the scan mode has been activated. o The scanning process can be ceased also by pressing the button HOME while on Bearing page. Then the direction finder changes to the bearing of the frequency, which was set before the scan mode was started. o The hotkey Excl. On/Off is only visible if Marine scan or Scan List is marked (s. Figure 53, position 3). By pressing this hotkey the currently marked scan mode will proceed the Exclude List during the scan. If this setting was already activated for the currently marked scan mode, pressing this button will deselect this option and the Exclude List will be ignored during the scan procedure. Edit Exclude is only visible, if Marine scan or Scan List is marked (s. Figure 53, position 4). By pressing this hotkey, the dialog for editing the Exclude List will be opened (s. 7.2.4.3). o o Pressing the hotkey Go to Result (s. Figure 53, position 5) during the scan list mode is currently running, will interrupt the scan mode, and open the Result List, where you can select the next action (s. Figure 54). This hotkey appears only if there is a result for this scan. Figure 54. Result List Settings RHOTHETA Page 57 of 140 User Manual RT-500-M Pressing the hotkey Go to Freq. (s. Figure 54, position 1) adopts the currently marked frequency as main bearing frequency and switches to the normal bearing mode on the Bearing page. Pressing the hotkey Delete Freq. (s. Figure 54, position 2) deletes the currently marked frequency from Result List. The deleted frequency will not be skipped anymore, when the results are scanned after pressing Scan Results. Pressing Scan Results (s. Figure 54, position 3) starts the scan list mode, which runs only around the frequencies which had a result during the last scan (frequency span around 100 kHz). Pressing Edit Search (s. Figure 54, position 4) will open the Search List dialog (s. Pressing Edit Exclude (s. Figure 54, position 5) will open the Exclude List dialog (s. Edit Scan below). 7.2.4.3). o Pressing the hotkey Edit Scan (s. Figure 53, position 6) will open the dialog for changing the settings of the Search List (s. Figure 55) Figure 55. "Search List" settings Pressing the hotkey New Freq. (s. Figure 55, position 1) generates a new line in the Search List and opens the Frequency Input Dialog in order to input a valid start frequency. By the input of a new start frequency, the stop frequency is automatically set to the same value as the start frequency. Pressing the hotkey Delete Freq. (s. Figure 55, position 2) deletes the currently marked line from the Search List. After an entry has been deleted and the dialog left by pressing OK, the deleted frequency range will be scanned in the normal manner, when you restart the scan. Pressing the hotkey Edit Start F. (s. Figure 55, position 3) opens the Frequency Input Dialog (s. 7.1.2.2), which allows modifying the Start frequency of the currently marked frequency range. Pressing the hotkey Edit Stop F. (s. Figure 55, position 4) opens the Frequency Input Dialog (s. 7.1.2.2) which allows modifying the Stop Frequency of the currently marked frequency range. RHOTHETA Page 58 of 140 User Manual RT-500-M Note Start- and stop-frequencies must be in the same frequency band (s. Table 1 in chapter 4), as the AU cannot switch from one band to another while running the scan algorithms. Note When choosing a COSPAS-SARSAT frequency as Start frequency, the AU will perform a COSPAS-

SARSAT scan and scan all CP-SS frequencies. A Stop frequency cannot be set for this option, as always all CP-SS frequencies are scanned. Pressing the hotkey Edit Cond. (s. Figure 55, position 5) opens the Scan List Conditions dialog Figure 56. "Scan List Conditions" dialog Time (def.) hotkey (s. Figure 56, position 1) defines the behavior of the Scan List algorithm if the active frequency (signal level > squelch level) has been found. If this hotkey is pressed, the default time of 30 seconds will be adopted after confirming this setting with OK. The scan algorithm will stay for the default time of 30 sec on an active frequency before continuing with scanning of the next frequencies. Pressing the hotkey Edit Time (s. Figure 56, position 2) will open a dialog for editing the time of staying on the actively received frequency before continuing with the scan procedure. Pressing the hotkey Signal>Sql. hotkey (s. Figure 56, position 3) defines the time of staying on the actively received frequency before continuing with the scan procedure. If this setting is confirmed, the scanning procedure will stay on the actively received frequency as long as the signal level is higher than the squelch level. If the hotkey Endless (s. Figure 56, position 4) was pressed and confirmed with OK, the scan algorithm will stay on the actively received frequency as long as the user terminates the scan or skips the current frequency. RHOTHETA Page 59 of 140 User Manual RT-500-M 7.3 Decode Page The Decode page manages the decoded COSPAS-SARSAT data. It does not only display the decoded COSPAS-SARSAT information but also stores the messages over time and calculates the true bearing and distance to the emergency beacon if the GPS data is available in the message. Furthermore, the calculated true bearing can be exported to the Bearing page which is displayed as a GPS-Arrow in gray. Press on DECODE in order to open the decode page. When switching to Decode page, the active COSPAS-SARSAT frequency is determined by the following conditions:

- By switching from Bearing page, the COSPAS-SARSAT frequency, which was active in the Bearing page, will be adopted. If no COSPAS-SARSAT frequency was active on the Bearing page, the last active frequency on the Decode page will be used. If on the Decode page no frequency was set or used, the frequency group 406.022028 is selected per default (s. 7.1.2.2, Selecting COSPAS-SARSAT Frequency Groups). Figure 57. Decode Page. General view. RHOTHETA Page 60 of 140 User Manual

-

-

Indication on Decode Page Pos. Element RT-500-M Meaning / Description Pressing this hotkey will open the Frequency Input Dialog with the COSPAS-SARSAT frequency groups (7.1.2.2). The hotkey label corresponds to the current operating frequency. Pressing this hotkey will activate the view for COSPAS-SARSAT Bearing Pressing this hotkey will activate the view for Bearing&List Pressing this hotkey deselects the currently marked line. Deselected lines are indicated by gray text. Pressing this hotkey will export the selected messages to the Bearing page. On the Bearing page the GPS coordinates of these messages will be shown with GPS arrows. Pressing this hotkey will open a dialog for deleting all stored CP/SS messages. If the dialog is opened, pressing this button will close the dialog without saving new values. If no dialog is opened, pressing this button will lead you back to the last activated page. The Bearing Page is the end point. Pressing this button always leads to the Bearing page. Even an opened dialog will be closed. If a sub-dialog is opened, pressing this button will close it and lead to the Bearing page, without saving the changed values. Up and Down arrows are used to select between the different lines from the list of received messages (move the green frame). Using Left and Right on the selected line, switches between decoded COSPAS-SARSAT messages with the same beacon ID but different time stamp. Pressing the OK button will select the currently marked line from the list of received messages. Pressing the DEL button will open a dialog for deleting the currently shown COSPAS-SARSAT message of the currently marked line from the list of received messages. 406.025 C/S Bearing Bearing&List Deselect Export Delete All Numeric keys are used to enter the numerical characters inside the dialogs. No function on the top level of the Decode page. Top line Navigation line of the screen, which allows switching between pages

(BEARING, SCAN, DECODE, SETUP). Table 10. Decode page, list of elements. RHOTHETA Page 61 of 140 User Manual RT-500-M 7.3.1 Selecting a COSPAS-SARSAT frequency In order to receive a COSPAS-SARSAT data pulse and to decode its content, the main frequency has to be adjusted to a COSPAS-SARSAT frequency. This can be done on the Bearing page or directly on the Decode page using the hotkey 406.025 (s. Figure 57, position 1). 7.3.2 COSPAS-SARSAT List View Press the hotkey C/S List in order to get to the COSPAS-SARSAT list view. This view shows the list with the received COSPAS-SARSAT pulses. When an emergency beacon is activated, it transmits a COSPAS-SARSAT pulse every 50 sec ( 5 sec). As soon as a valid pulse is received, the hotkey 406.025 changes its label to Confirm and blinks in yellow (s. Figure 58). Additionally, an acoustic warning tone is emitted. Press Confirm in order to accept the message and to clear the alarm. Figure 58. Confirming a new COSPAS-SARSAT message. For each new received ID (different beacon) a new line is generated so that messages are sorted according to the beacon ID. Each line number (column Num.:) is related to a certain COSPAS-

SARSAT beacon ID. The time entry in the line shows the receiving time of the message (s. Figure 59, A). The corresponding COSPAS-SARSAT message content of the selected beacon ID is displayed in the area B on the right side of the screen. Figure 59. Decode Page. COSPAS-SARSAT List View. Pressing the Left and Right arrow buttons of the keypad switches between the older and newer messages of the same emergency beacon. Press DEL button of the keypad in order to delete a selected message. Press hotkey Delete All in order to delete all COSPAS-SARSAT messages. A detailed explanation of all hotkeys can be found in the next chapters. RHOTHETA Page 62 of 140 User Manual RT-500-M Area C indicates the time when the next COSPAS-SARSAT pulse is expected. If after one minute no COSPAS-SARSAT pulse is received, the bar-graph-indicator is fully filled and shows the text --:--. The indicator in the Area D (s. Figure 59, D) shows the following values:

o Direction from the current GPS position to the position of the marked COSPAS-SARSAT message (GPS TB = GPS True Bearing). o Distance from the current GPS position to the position of the actually marked COSPAS-

SARSAT message (the indication km or NM is adjustable in the Setup, s.7.4.2.4). o Frequency:

By viewing an old message frequency may be other than the current frequency. In this case the frequency is displayed in gray. The current frequency is displayed in white. The current frequency is also displayed in the label of the hotkey for adjusting frequency. Note GPS TB data can be shown only if compass and GPS are available. The distance can be shown without connection of vessels compass if GPS is connected to DCU. 7.3.3 COSPAS-SARSAT Bearing View This COSPAS-SARSAT bearing view allows the graphical indication of the decoded COSPAS-

SARSAT information of the selected beacon ID. Press the hotkey C/S Bearing (s. Figure 57, position 2) to open the COSPAS-SARSAT Bearing view. Note Please note that the label of the hotkey will turn to C/S List in order to get to the list page again. The C/S Bearing page displays the following information, which corresponds to the selected beacon ID:

The numerical bearing indication (True Bearing) The indication of the calculated bearing as the gray arrow (GPS Arrow) The calculated distance to the target The COSPAS-SARSAT frequency The heading of the ship indicated by the compass rose and the top triangle (here: 61) Corresponding number and beacon ID and the time of the last received pulse Pressing the Left and Right arrow buttons of the keypad switches between the older and newer messages of the same emergency beacon. Figure 60. Decode Page: Bearing View. RHOTHETA Page 63 of 140 User Manual RT-500-M o Change the active COSPAS-SARSAT frequency by using the hotkey 406.025 (s. Figure 60, o Pressing the hotkey C/S List (s. Figure 60, position 2) will open to the COSPAS-SARSAT position 1). List view (s. 7.3.2). o Pressing the hotkey Bearing&List (s. Figure 60, position 3) will change to the COSPAS-

SARSAT Bearing and List view (s. 7.3.4). o Like in the COSPAS-SARSAT List view, it is possible to delete all stored COSPAS-SARSAT messages by pressing the hotkey Delete All (s. Figure 60, position 5). Figure 61. Dialog for confirming of deleting all CP-SS messages. o Hotkey Export exports the GPS coordinates of the currently displayed COSPAS-SARSAT message to the Bearing page. (s. Figure 60, position 4). See also chapter 7.3.5 Export to Bearing Page 7.3.4 COSPAS-SARSAT Bearing and List This view combines the COSPAS-SARSAT Bearing and COSPAS-SARSAT List views for the last arrived COSPAS-SARSAT messages (s. Figure 62). Figure 62. "Decode page. "Bearing and List" view. o Use the hotkey 406.025 for changing the frequency (s. Figure 62, position 1). o Pressing the hotkey C/S Bearing (s. Figure 62, position 2) will change to the COSPAS-

SARSAT Bearing view (s. 7.3.3). RHOTHETA Page 64 of 140 User Manual RT-500-M o Pressing the hotkey C/S List (s. Figure 62, position 3) will change to the COSPAS-SARSAT List view (s. 7.3.2). o Hotkey Export exports the GPS coordinates of the currently displayed COSPAS-SARSAT message to the Bearing page. (s. Figure 60, position 4). See also chapter 7.3.5 Export to Bearing Page o Like in the COSPAS-SARSAT List view, it is possible to delete all stored COSPAS-SARSAT messages by pressing the hotkey Delete All (s. Figure 60, position 5). 7.3.5 Export to Bearing Page The calculated bearing of an emergency beacon, which is based on the decoded GPS position, can be exported to the Bearing page by pressing the hotkey Export. In this case, the RT-500-M is operating on the selected COSPAS-SARSAT frequency in the normal bearing mode. The GPS based information like:

- numerical indication of the GPS true bearing,

-

-

indication of the GPS true bearing as the GPS Arrow in gray, the calculated distance to the emergency beacon is displayed at the same time. Figure 63. Indication of the GPS based bearing on the Bearing page RHOTHETA Page 65 of 140 User Manual RT-500-M 7.4 Setup Page After the AU and power supply were connected to the DCU and the system was switched on, it is ready to work with the default settings. All system settings, configurations etc. are made in the "Setup" page. The screen top line of the Setup page contains navigation keys that include system setup menus sorted by the common concept. The settings of these menus will be explained further in this chapter. The bearing runs in the background while changing settings on the Setup page. That means e. g. when bearing on 121.5 MHz and switching from Bearing page to the Setup page, an ELT signal will be detected and the alarm will be provided. Note Incorrect settings may lead to considerable malfunctions of the DF system RT-500-M. Therefore, sensitive parameters concerning the bearing operation are password-protected against not authorized alterations. Any changes of settings, which require password approval, are to be made only by instructed personnel. 7.4.1 General After selecting the Setup over the corresponding hotkey on the Bearing page, the following menu page opens (s. Figure 64). The menu General contains uncritical settings that can be changed any time without influence on the important system parameters, therefore it is not password protected and can be used by the operator. Figure 64. Setup page. General settings (administrator view) RHOTHETA Page 66 of 140 User Manual RT-500-M Indication on Setup Page, General Settings Pos. Element Meaning / Description Switches between two states:

- Access level: operator

- Access level: administrator Set Operator /

Set Admin Change PW Edit Value Reset Values Beep. On/Off Freq. Info Top line Pressing this hotkey will lead to the dialog for changing the password for the Administrator access level, where the old password has to be entered first, whereupon the new password can be defined. Depending on the currently marked line, using this hotkey will open the dialog for changing the corresponding value (s. descriptions below). Resets all values to the default settings. The default setting values cannot be changed by the user. Switches between two states:

- Beeper is activated by each button press

- Beeper does not react on button presses Opens a dialog which shows the currently available frequencies (also not available or locked frequencies will be shown) (s. 7.4.1.8). When there is a dialog opened, pressing this button will close the dialog without adopting new values. When there is no dialog opened, pressing this button will go back to the last activated page. The Bearing Page is the end-point. Pressing this button always leads to the Bearing Page. Even an opened dialog will be closed, without adopting the changed values. Up and Down arrows are used to select between the general settings (move the green frame). Inside the dialogs (e.g. password or value editing) they are used to navigate between the characters of the virtual keypad. Right and left arrows have a function inside the dialogs, but not on the top level of the Setup page. With the OK button the confirming of values or opening the general settings dialogs is accomplished. Inside the general settings dialogs the DEL button is used to clear the whole input at once. On the top level of the Setup page, this button has no function. Numeric keys are used to enter the numerical characters inside the dialogs. On the top level of the Setup page they have no function. Navigation line of the screen, which allows switching between setup menus (General, Display, System, Interface and Service). Table 11. Setup page, general settings. List of elements. RHOTHETA Page 67 of 140 User Manual RT-500-M The General menu provides general information like serial numbers and software versions of DCU and AU (s. Figure 65). 7.4.1.1 Access Level / Login Depending on the access level of the user, the scope of accessible and visible settings on the Setup page is different. Operator:

The Setup page will only allow making settings in the menu General. This ensures that no essential system settings can be influenced or corrupted by mistake. The access level Operator does not require any password as the operator has the minimum set of options for possible setup of the system. DCU software version

(0.9.9h) AU software version

(3.33) DCU Serial Nr.

(0001336) AU Serial Nr.

(00114) Figure 65. Setup page, General settings appearance for the access level Operator Administrator:

Has the maximum access to the possible settings (except a set of settings, which are predefined for RHOTHETA specialists for maintenance and support purposes). After powering on of the system for the first time, the device will be started with the default access level Administrator. It is also possible to set the access level to Administrator (e.g. after the hotkey Set Operator was pressed) using the default password:

admin All essential settings of the system, that have a direct influence on the bearing have to be done by authorized personnel. Note After the setting up of the system, it is recommended to change the password from default to a new value and set the access level to Operator (s. 7.4.1.7). The access level is then stored permanently on the device and remains after the restart of the device. 7.4.1.2 Audio Beeper Pressing any key of the DCU keypad produces a short beep. This behavior is defined as the default setting for Audio Beeper after the first booting of the DCU. The acoustic reaction on the key pressing can be changed anytime in the setup menu General. Setting for the beeper can be changed by pressing OK or the hotkey Edit Value, while the line Audio Beeper is marked. Both actions call up the same dialog (s. 7.4.1.7, Edit value for setting Audio Beeper). Pressing the hotkey Beep On/Off will directly switch between the On and Off settings. RHOTHETA Page 68 of 140 User Manual RT-500-M 7.4.1.3 Audio Line Output Audio line output signal can be found at the POWER + IO connector. It can be used for connection to the audio system of the vessel. The level of the line out signal is adjustable from 0% to 100% (s. 7.4.1.7, Edit value for setting Audio Line Output). Audio line exit has a determined output level and is independent of the volume adjustment. 7.4.1.4 Audio Speaker The RT-500-M DCU has an internal speaker that can be used to monitor the audible signals or acoustic alarms. Alternatively, the external speaker can be used e.g. for release an alarm on the ship. 7.4.1.5 Set Operator / Set Admin Dialog If the Administrator access mode is currently active and the hotkey Set Operator is pressed, it will instantly set the access level to Operator without asking for permission or password. The appearance of the Setup page will change immediately and the hotkey designation will change to Set Administrator If the Operator access mode is active, pressing the hotkey Set Admin will open the Input Password dialog, where either the default or the own (previously changed from the default) password should be entered into the Input Password for Administrator field. Input field for the password Virtual keypad Validity message Input delete key End of input Figure 66. Accessing the administrator level After the input of the password is complete it should be confirmed using the End of User Input button. The validity message: Password valid, press OK! or No valid password! will appear. If the password is not valid, delete the input (s. Figure 66, Input delete key) and proceed with the next try. If the password is valid, by confirming with OK the administrator access level will be achieved. 7.4.1.6 Change Password Dialog Pressing the hotkey Change PW (s. Figure 67) will open the dialog for changing the current (or default) administrator access level password. This hotkey is only visible in the administrator access mode. Figure 67. Changing password RHOTHETA Page 69 of 140 User Manual RT-500-M Continue with the next instructions in order to change the password. Input field for the password Virtual keypad Input delete key End of input Figure 68. Changing the administrator password First, the old password will be requested (Input old Password). If the input is correct, the new password will be requested in the next step (Input new Password). The password change dialog can be canceled by pressing "ESC" at any step, except after confirming the new password value. If all the inputs are correct and confirmed, the message Password successfully changed! will appear

(s. Figure 68) and the dialog can be left by pressing the OK button. 7.4.1.7 Edit Value Dialog Depending on the currently marked line, pressing the hotkey Edit Value will lead to the corresponding dialog. Edit value for setting Access Level /Login Choosing the administrator access level Choosing the operator access level Figure 69. Edit value dialog for access level RHOTHETA Page 70 of 140 User Manual RT-500-M 1. Pressing the hotkey Set Admin will lead to the Set Admin dialog, where the password input is required (s. 7.4.1.5). Pressing the hotkey Set Operator will change the New Access Level /Login field to access level Operator (s. Figure 70):

Figure 70. Editing the access level to "Operator"

2. By pressing OK the new access level will be accepted and pursued. Pressing ESC closes the dialog and administrator access level will be retained. Edit value for setting Audio Beeper Figure 71. Editing the value for the audio beeper 1. Pressing the hotkey Beeper On or Beeper Off will write the corresponding message into the New Setting for key pressing. 2. By confirming with OK the setting will be accepted and the dialog will be closed. For discarding the changes press ESC at any step and escape the dialog without saving the new value. RHOTHETA Page 71 of 140 User Manual RT-500-M Edit value for setting Audio Line Output Figure 72. Edit value of the audio line output level 1. In the edit value dialog, the level of the audio line output in percent can be changed using the numeric keys of the DCU keypad. 2. Pressing the Set Default hotkey will set the line output to the default value of 75%. 3. Press OK to confirm the input and leave the dialog. For discarding the settings, press ESC at any step and escape the dialog without saving the new value. Edit value for setting Audio Speaker Figure 73. Edit value for the speaker 1. Pressing the hotkey Internal or External will write the corresponding message into the New Setting field. 2. By confirming with OK the setting will be accepted and the dialog will be closed. For discarding the settings, press ESC at any step and escape the dialog without saving the new value. 7.4.1.8 Frequency Information Dialog After pressing the hotkey Freq. Info (s. Figure 65) the frequency information dialog opens. The frequency information is presented in the form of a list of the available and not available frequency bands. RHOTHETA Page 72 of 140 User Manual

RT-500-M Explanation of the status indication Figure 74. Frequency information dialog Explanation of the abbreviations Hotkey for additional information about locked frequencies o The frequency bands that are marked with Std. are basic frequency ranges. These frequencies are always licensed in the standard version of RT-500-M and thus always appear as Available. o The frequency ranges designated with F1 .. F4 are optional extended ranges. In the standard version of RT-500-M, they are not licensed and thus marked as Not available. These optional frequency bands can be acquired separately (please contact RHOTHETA). o However, it is possible to lock some particular frequencies as well as certain frequency bands, if these are licensed. After a frequency has been locked by the user, it will not be possible to set this frequency for the bearing operation. o Locking of frequencies is the responsibility of the administrator. The operator can only view the frequencies which have been locked by the administrator. Figure 75. Locked frequencies. Operator view Locked frequencies can be viewed in the embedded separate dialog, which is available over the hotkey See locks (s. Figure 74). Figure 76. Locked frequencies. Administrator view RHOTHETA Page 73 of 140 User Manual RT-500-M Lock / Unlock Frequencies Procedure Locking or unlocking of frequencies is only available over the administrator access level. To mark any frequency as locked/unlocked following steps are required:

1) Press the See locks hotkey in the Freq. Info dialog. The window, which is shown in Figure 76 appears. 2) To lock a single frequency, press the hotkey Add Freq. The Frequency input dialog appears

(for further information s. 7.1.2.2), where a frequency, channel number or a Cospas-Sarsat frequency can be entered. After confirming with OK a single frequency is added. It appears then in the list of locked frequencies as Start Frequency as well as Stop Frequency. 3) To lock a certain frequency band proceed with step 2), adding the start frequency first. Then by pressing Edit Stop hotkey the last frequency of the to-be -locked band can be entered. In the same way, the start frequency can be changed using the Edit Start hotkey. 4) Unlocking (deleting) of a frequency or a frequency band is accomplished with pressing the hotkey Delete Freq. Note Pressing this hotkey will delete the marked frequency immediately without asking for confirmation!

5) To unlock the whole list of frequencies, use the hotkey Delete All. a. The difference to deleting the single frequency or frequency band is that for leaving the dialog the action has to be confirmed with OK. Note If after deleting all locked frequencies the dialog will be left by pressing ESC, the dialog will be closed without saving any changes. That means, the list will not be deleted and is accessible again after pressing the hotkey See locks. 7.4.2 Display On the Setup page, the Display menu can be selected via the administrator access level only. The Display page enables modifying of settings that affect the graphical representation of the application. After pressing the Display navigation key, following menu page opens (s. Figure 77). RHOTHETA Page 74 of 140 User Manual RT-500-M Figure 77. Setup page. Display settings Indication on Setup Page, Display Settings Pos. Element True Bearing Mag. Bearing Rel. Bearing Edit Value Reset Values Meaning / Description Sets the bearing reference direction to TRUE without opening the corresponding dialog (s. Table 5. Bearing reference directions). Sets the bearing reference direction to MAGNETIC without opening the corresponding dialog (s. Table 5. Bearing reference directions). Sets the bearing reference direction to RELATIVE without opening the corresponding dialog (s. Table 5. Bearing reference directions). Depending on currently marked line, using this hotkey will open the dialog for changing the corresponding value (s. descriptions below) Resets all values to the default settings. The default setting values cannot be changed by the user. When there is a dialog opened, pressing this button will close the dialog without adopting new values. When there is no dialog opened, pressing this button will go back to the last activated page. The Bearing page is the end-point. Pressing this button always leads to the Bearing Page. Even an opened dialog will be closed, without adopting the changed values. Page RHOTHETA Page 75 of 140 User Manual RT-500-M Up and Down arrows are used to move between the display settings. Right and left arrows have no function inside the display settings page. With the OK button confirming of values or opening the display settings dialogs is accomplished. Inside the display settings dialogs, the DEL button is used to clear the whole input at once. On the top level of this page, this button has no function. Numeric keys are used to enter the numerical characters inside the dialogs. On the top level of the page, they have no function. Top line Navigation line of the screen, which allows switching between setup menus (General, Display, System, Interface and Service). Table 12. Setup page, display settings. List of elements 7.4.2.1 Bearing Indication Hold Time The bearing indication hold time defines how long the bearing value is indicated after the signal fell under the squelch level. If there is no more valid bearing information available, the last bearing data (bearing arrow, life values and digital bearing display) are displayed on the Bearing page for a defined period of time. This time is set to 2 seconds by default and configurable via this setting. By pressing the OK button or the hotkey Edit Value, the following dialog is opened. Setting to default value

(2 seconds) Setting to Endless (last bearing is shown until the next valid bearing) Figure 78. Editing the bearing indication hold time o The new value for the bearing hold time can be entered in the input field New Setting, using the numeric keys of the keypad. o Use the hotkey Endless to set the bearing hold time to an endless value, which means that

(after the signal was interrupted) the last valid bearing information will be shown as long as the new valid bearing needs to arrive. o To set the bearing hold time to the default value (2 s), press the hotkey Set Default. o For the final confirmation, press OK or use the ESC button to leave the dialog without adopting the new value. RHOTHETA Page 76 of 140 User Manual RT-500-M 7.4.2.2 Bearing Reference Direction The bearing reference direction is significant for the bearing indication. The direction of the bearing arrow in the 360 display (and compass rose indication) is always referred to a defined point in space. This reference point can be the magnetic north position, true north position and relative (reference is the direction to the vessels bow. For further explanation refer to chapter 7.1.2. Pressing OK or Edit Value while the line Bearing Reference Direction is marked opens the corresponding dialog. Choosing the Magnetic reference direction Choosing the True reference direction Choosing the relative reference direction Choosing the default reference direction (True) Figure 79. Bearing reference direction dialog o Press the hotkey True Bearing to set the bearing reference direction relative to true

(geographic) north (only if compass data is available). If no compass data is available, the bearing page will not adopt the True setting. The relative bearing and No Compass warning will be shown. o Press the hotkey Mag. Bearing to set the bearing reference direction relative to magnetic north (only if compass data is available). If no compass data is available, the bearing page will not adopt the Magnetic setting. The relative bearing and No Compass warning will be shown. o Press the hotkey Rel. Bearing to set the bearing reference direction relative to the heading of the vessel. available). o Press Set Default to use the default value (true north direction, only if compass data is o To save the changed value, press OK. o Pressing the ESC button will leave the dialog without adopting the changed value. 7.4.2.3 Bearing Scale Offset In this menu an offset for the bearing rose can be set. This is useful for e.g. better visual comprehension of the bearing direction indication. It can be used, for instance, if the window of the vessels control cabin shows to another direction than the bow of the ship and it is desired to take this direction as the relative direction. After setting the bearing scale offset to a certain value that differs from 0, the bearing rose will turn according to this value. To set the bearing scale offset, press OK or Edit Value while the line Bearing Scale Offset is marked. The corresponding dialog will open. RHOTHETA Page 77 of 140 User Manual RT-500-M Figure 80. Bearing scale offset editing dialog o Type any value in the New Setting input field by using the numeric keys of the keypad to set the value of the scale offset. o Press the hotkey Set Default to set the default value for the bearing scale offset (0). o Confirm the changed value with OK or press ESC to leave the dialog without changing the previous value. 7.4.2.4 Distance Unit The indicating of distances can be either in kilometers [km] or in nautical miles [NM]. The default value is [km]. To change the indication of the distance unit, press either the OK or Edit value while the setting is marked by the green frame. Choosing the kilometers as the distance indication unit Choosing the nautical miles as the distance indication unit Choosing the default setting for the distance indication

(kilometers) Figure 81. Changing the distance unit o Press the hotkey Set [NM] to set the distance unit to [NM] (Nautical Miles). Each distance indication in the application will be indicated in nautical miles. o Pressing the hotkey Set [km] will set the distance unit to [km] (kilometers). Each distance indication in the application will be indicated in kilometers. o Press the hotkey Set Default to set the distance indication to the default value (kilometers). o Confirm the changed value with OK or press ESC to leave the dialog without changing the previous setting. Level Unit 7.4.2.5 Indicating of levels (like signal level, or squelch level) can be either in [%] or in [dB]. To change the currently chosen unit for the levels indication press either the button OK or Edit Value, during the setting Level Unit is marked. RHOTHETA Page 78 of 140 User Manual RT-500-M Choosing dBm as level indication unit Choosing percent as level indication unit Choosing the default setting for level indication (%) Figure 82. Changing the level unit o Press the hotkey Set [%] to set the level unit to [%] (percent). Each level indication in the DCU application will be indicated in percent. o Pressing the hotkey Set [dBm] will set the level unit to [dBm]. Each level indication in the application will be indicated in dBm. o Press the hotkey Set Default to set the distance indication to the default value (%). o Confirm the changed value with OK or press ESC to leave the dialog without changing the previous setting. 7.4.2.6 Light Sensor Settings The light sensor is used in the DCU to adjust the brightness of the display, legends and LEDs automatically according to the ambient light level. In this menu point, which contains three settings, the characteristics of the light sensor can be defined. After pressing OK or Edit Value while the menu point Light Sensor Settings is marked, the following dialog will open. Choosing e.g. Minimum Range setting for editing Setting all values to default settings Figure 83. Light sensor settings With the minimum / maximum range settings one can influence the spacing of changing the brightness of display, legends or LEDs. o Other than with other dialogs of the Display menu, editing of the values is only available over the Edit Value hotkey (pressing OK is valuated as accepting of the present values and will lead out of the dialog). o Leaving the top level dialog (s. Figure 83) always press OK for the second time (after confirming the actual setting), otherwise, the changed settings will not be adopted. RHOTHETA Page 79 of 140 User Manual RT-500-M Minimum Range The minimal value of the light sensor is 0 (default value). To change this value, press the hotkey Edit Value, while Minimum Range is marked. Figure 84. Changing the minimum range value of the light sensor o Type the new value for the minimum range of the light sensor in the New Setting input field, using the numeric buttons of the DCU keypad. o Use the Set Default hotkey to reset the value to the default setting. o Confirm the changed value with OK or press ESC to leave the dialog without changing the previous setting. Maximum Range The maximal value of the light sensor is 1000. Figure 85. Changing the maximum range value of the light sensor o Type the new value for the maximum range of the light sensor in the New Setting input field, using the numeric buttons of the DCU keypad. o Use the Set Default hotkey to reset the value to the default setting. o Confirm the changed value with OK or press ESC to leave the dialog without changing the previous setting. Time Delay This setting determines how fast the system brightness reacts to the changing of ambient brightness. The adjustable range is between 0 s and 999 s. Recommended value is the default value of 20 seconds, which ensures that e.g. the shadow of a person that quickly passes by, influences the brightness of the system. To change this value, press the hotkey Edit Value, while Time Delay is marked. RHOTHETA Page 80 of 140 User Manual RT-500-M Figure 86. Changing the time delay value for the light sensor o Type the new value for the delay value of the light sensor in the New Setting input field, using the numeric buttons of the DCU keypad. o Use the Set Default hotkey to reset the value to the default setting. o Confirm the changed value with OK or press ESC to leave the dialog without changing the previous setting. 7.4.2.7 Standby Brightness Over this setting, the general brightness during the standby mode can be defined. To change this value, press the hotkey Edit Value, while Standby Brightness is marked. Figure 87. Adjusting the standby brightness o Type the new value for the standby brightness value in the New Setting input field, using the numeric buttons of the DCU keypad or use the hotkey Off (s. Figure 87, position 1) in order to set the standby brightness to a black screen-value. If the setting Off is confirmed with OK, the display will be turned off after the button Standby is pressed. o Use the Set Default hotkey (s. Figure 87, position 2) to reset the value to the default setting o Confirm the changed value with OK or press ESC to leave the dialog without changing the

(0%). previous setting. RHOTHETA Page 81 of 140 User Manual RT-500-M 7.4.3 System The System settings page contains a number of the internal system settings, which are only available over the administrator access level. All settings are organized alphabetically in order to improve the handling of the page. Caution Incorrect system settings may lead to malfunctions of the system. The System settings page contains multiple settings that are represented by textual lines. Keep pressing the Up or Down arrow buttons of the DCU keypad in order to switch to the next page with the next settings (after the first set of settings of the page is over). There are currently 12 setting-

lines on the Setup page that where appropriate include the corresponding sub-settings. Figure 88. Setup page. System settings. Indication on Setup Page, Display Settings Pos. Element Edit Value Meaning / Description Depending on currently marked line, using this hotkey will open the dialog for changing the corresponding value (s. descriptions below) RHOTHETA Page 82 of 140 User Manual RT-500-M Resets all values to the default settings. The default setting values cannot be changed by the user. When there is a dialog opened, pressing this button will close the dialog without adopting new values. When there is no dialog opened, pressing this button will go back to the last activated page. The Bearing page is the end point. Pressing this button always leads to the Bearing page. Even an opened dialog will be closed, without adopting the changed values. Up and Down arrows are used to move between the system settings. Right and left arrows have no function inside the system settings page. With the OK button confirming of values or opening the system settings dialogs is accomplished. Inside the dialogs for the system settings, the DEL button is used to clear the whole input at once. On the top level of this page, this button has no function. Reset Values Numeric keys are used to enter the numerical characters inside the dialogs. On the top level of the page they have no function. Top line Navigation line of the screen, which allows switching between setup menus (General, Display, System, Interface and Service). Table 13. Setup page, system settings. List of elements. 7.4.3.1 Alarm Pulse With this setting menu, the behavior of the alarm output can be defined. The alarm output is provided by the DCU POWER+IO Connector and can be used for related alarm functions like activating a siren. In order to facilitate the alarm function using the DCU (in combination with the alarm system that is used on the vessel), the DCU settings are changeable. By pressing the OK button or the hotkey Edit Value, while the setting Alarm Pulse is marked by the green frame, the following dialog is opened. Note In this dialog pressing OK will be interpreted as confirming of the whole set of settings that are currently displayed, which will lead to closing the dialog confirming changed values. To change the single settings only the hotkeys for modifying the related values are used (s. Figure 89). RHOTHETA Page 83 of 140 User Manual RT-500-M Figure 89. Alarm pulse settings Active direction setting defines which direction (low or high) will lead to an alarm indication. This setting is changeable using the hotkeys High active / Low active or Edit Value (s. Figure 89, numbers

), whereat using the first two hotkeys will change the value without opening the separate dialog. o By pressing the hotkey Edit Value, the dialog for changing the active direction of the alarm and

, output will be opened. The handling of this dialog is shown in Figure 90. Setting the alarm pulse direction to LOW Setting the alarm pulse direction to HIGH Selecting the default value Figure 90. Active direction dialog o Pressing the High active hotkey sets the active direction of the alarm pulse to HIGH. That means, the default state of the alarm output is low and an alarm is indicated by the high state. o Pressing the High active hotkey sets the active direction of the alarm pulse to LOW. That means, the default state of the alarm output is high and an alarm is indicated by the low state. o Pressing the Set Default hotkey sets the alarm output to the default value, which is HIGH. Alarm mode setting defines, how the alarm output behaves during the alarm state (alarm mode continuous or pulsed). This setting is changeable using the hotkeys CONT. / PULSE or Edit Value (s. Figure 89, numbers

), whereat using the first two hotkeys will change the value without opening the separate dialog. o By pressing the hotkey Edit Value, the dialog for changing the alarm mode of the alarm and

, output will be opened. The handling of this dialog is shown in Figure 91. RHOTHETA Page 84 of 140 User Manual Setting the alarm mode to Pulse Setting the alarm mode to Continuous RT-500-M Figure 91. Alarm mode dialog Selecting the default value o Pressing the CONT. hotkey sets the alarm mode of the alarm pulse to Continuous. That means the output is high or low as long as the alarm condition exists. o Pressing the PULSE hotkey sets the alarm mode to Pulse, which means that the output is pulsed as long as the alarm condition exists. The pulsed signal is defined by the settings Active Direction, Time Off and Time On. o Pressing the Set Default hotkey sets the alarm output to the default value, which is Pulse Time Off This setting defines the time of the absence of the alarm indication (the duration of the alarm absence), e.g. using the default value of 5 seconds will stop the alarm indication for 5 seconds after period of the alarm-on time, which is adjusted in the Time On setting . o To change the Time Off- time, press the hotkey Edit Value (s. Figure 89, dialog will open (s. Figure 92).

). The related Figure 92. Time off Dialog o Use the number keys of the DCU keypad to enter the new value for the Time Off setting. o Press the hotkey Set Default to use the default value of 5 s. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. Time On This setting defines the time of the alarm indication (the duration of the alarm pulse), e.g. using the default value of 5 seconds will lead to an alarm indication for 5 seconds after the Time on was triggered. o To change the Time On- time, press the hotkey Edit Value. The related dialog will open (s. Figure 93). RHOTHETA Page 85 of 140 User Manual RT-500-M Figure 93. Time on Dialog o Use the number keys of the DCU keypad to enter the new value for the Time On setting. o Press the hotkey Set Default to use the default value of 5 s. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. 7.4.3.2 Antenna Unit The RT-500-M dipole antenna unit can only be mounted in the vertical position. For standard mounting (which is the default setting), the mounting flange points to the bottom of the vessel. This setting must be changed to Upside Down, if the antenna is mounted hanging upside down

(flange on the top), in order to get the correct signal processing. o By pressing the OK button or the hotkey Edit Value, while the setting Antenna Unit is marked by the green frame, the following dialog is opened. Choosing the Upside Down mounting position Choosing the Standard mounting position Selecting the default value Figure 94. Antenna unit (mounting position) dialog o Pressing the Standard hotkey sets the value for the mounting position to Standard. o Pressing the Upside D. hotkey sets the value for the mounting position to Upside Down. o Pressing the Set Default hotkey sets the antenna unit mounting position to the default value, o Confirm the setting with OK or leave the dialog without adopting the new value by pressing which is Standard ESC. 7.4.3.3 Antenna Offset The antenna is to be mounted facing "North or 0 direction. There is a "North" respectively 0 marker on the antenna unit, which has to point to the vessels bow, parallel to the vessels longitudinal axis. RHOTHETA Page 86 of 140 User Manual RT-500-M If for some reason the antenna cannot be mounted pointing exactly to the bow, the deviation correction should be put in, using this setting, in order to calculate bearing values correctly. The offset is adjustable from 0 to 359 (e.g. -15 = 345). o By pressing the OK button or the hotkey Edit Value, while the setting Antenna Offset is marked by the green frame, the following dialog is opened. Figure 95. Antenna offset dialog o Use the number keys of the DCU keypad to enter the new value for the Antenna Offset. o Press the hotkey Set Default to use the default value of 0. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. 7.4.3.4 AU Calibration This setting determines whether calibration values are used for the bearing calculation or not. In the default case, the internal calibration values of the AU are used, which can be disabled using this setting. o By pressing the OK button or hotkey Edit Value, while the setting AU Calibration is marked by the green frame, the following dialog is opened. Setting the AU calibration to Calibration On Setting the AU calibration to Calibration Off Selecting the default value Figure 96. AU calibration on/off dialog o Including the AU calibration values into the bearing calculation is done by pressing the hotkey Calib. On. o To disable using the internal calibration values of the AU choose the hotkey Calib. Off (only in o Press the hotkey Set Default to use the default value (calibration on). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing special cases). ESC. RHOTHETA Page 87 of 140 User Manual RT-500-M 7.4.3.5 Beep Tone Decoding Parameters of the menu Beep Tone Decoding control the behavior of the function Fast Channel Scan, for the case that an alarm should be triggered only if an audio signal (BeepTone) has been decoded. This setting is only usable, if option Fast Channel Scan is unlocked (for further information please see 7.2.3.2). The user can define characteristics of beep tone decoding by pressing OK or the hotkey Edit Value, while the setting Beep Tone Decoding is marked by the green frame. The following dialog opens (s. Figure 97). Figure 97. Beep tone decoding settings All values can be set to the default values, using the hotkey Reset Values (s. Figure 98, position 5). Frequency High defines the upper frequency for the beep tone decoding. The default value for this setting is 900 Hz. There are two ways to change this setting: either using the Freq. High or the Edit Value hotkey (s. Figure 98, positions 1 and 4), both of these hotkeys will open the same dialog. Figure 98. Dialog for the upper frequency (Beep Tone Decoding) o Type the new value for the upper frequency into the New Setting field, using the DCU o Press the hotkey Set Default to use the default value (900 Hz). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing number keys. ESC. RHOTHETA Page 88 of 140 User Manual RT-500-M Frequency Low defines the upper frequency for the beep tone decoding. The default value for this setting is 700 Hz. There are two ways to change this setting: either using the Freq. Low or the Edit Value hotkey (s. Figure 98, positions 2 and 4), both of these hotkeys will open the same dialog. Figure 99. Dialog for the lower frequency (Beep Tone Decoding) o Type the new value for the lower frequency into the New Setting field, using the DCU o Press the hotkey Set Default to use the default value (700 Hz). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing number keys. ESC. Decoding Time defines the decoding time for the beep tone decoding (minimum required duration of the signal). The default value for this setting is 200 ms. There are two ways to change this setting: either using the Dec. Time or the Edit Value hotkey(s. Figure 98, positions 3 and 4), both of these hotkeys will open the same dialog. Figure 100. Decoding time dialog o Type the new value for the decoding time into the New Setting field, using the DCU number o Press the hotkey Set Default to use the default value (200 ms). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing keys. ESC. RHOTHETA Page 89 of 140 User Manual RT-500-M 7.4.3.6 Frequency Input Dialog Time This setting defines the duration until the dialog for frequency input (s. 7.1.2.2) closes automatically if no interaction of the user happens. o By pressing the OK button or hotkey Edit Value, while the setting Frequency Input Dialog Time is marked by the green frame, the following dialog is opened. Figure 101. Frequency input hold time dialog o Type the new value for the frequency input hold time into the New Setting field, using the o Press the hotkey Set Default to use the default value (10 s). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing DCU number keys. ESC. 7.4.3.7 Lock/Unlock Frequencies It is possible to lock or unlock some particular frequencies as well as entire frequency bands from the licensed frequency ranges. After a frequency has been locked, it will not be possible to set this frequency for the bearing operation on the Bearing page. Locking/unlocking of frequencies is the responsibility of the administrator. The operator can only view the frequencies, which have been locked by the administrator in the dialog Frequency Information Dialog (s. 7.4.1.8). o By pressing the OK button or hotkey Edit Value, while the setting Lock/Unlock Frequencies is marked by the green frame, the following dialog is opened (s. Figure 102). This view will contain only one hotkey Add Freq. if entered for the first time, when no frequency is locked yet. Figure 102. Locked frequencies list. Administrator view o The use of this dialog is described in chapter 7.4.1.8, please refer to it for more information. RHOTHETA Page 90 of 140 User Manual RT-500-M 7.4.3.8 MOB Trigger This setting defines the event for starting the MOB mode. Basically, the MOB mode can be triggered by three situations:

1. The vessels crew witnesses a person falling over board. The MOB mode can be activated manually by pressing the MOB button (s. Figure 6, position 7) of the DCU keypad. 2. The person, who falls over board, is wearing an ELT (emergency locator transmitter) that produces a typical modulated emergency signal. The emergency signals are recognized by RT-500-M and can activate the MOB function if the corresponding setting is activated. 3. The person, who falls over board, is wearing a personal transmitter beacon that produces an audio emergency signal (beep tone with distinct acoustic frequency). The emergency signals are recognized by RT-500-M and can activate the MOB function if the corresponding setting is activated. To adjust the trigger event for starting the MOB mode, press the OK button or hotkey Edit Value, while the setting MOB Trigger is marked. The following dialog will open (s. Figure 103). Figure 103. MOB trigger dialog o Choose the new setting using one of three hotkeys (s. Figure 103, positions 1, 2 and 3), which will then appear in the New Setting field. Only Man. The MOB mode will be started by pressing the MOB button only. Man./ELT The MOB mode will either be started by pressing the MOB button or by an ELT alarm. Man./ELT/BT The MOB mode will be started by the following events:

- User presses the MOB button

- ELT alarm occurred

- Beep Tone detected Note BT (beep tone) is active only in Fast Channel Scan. o Press the hotkey Set Default (s. Figure 103, position 4), to use the default value (Only o Confirm the setting with OK or leave the dialog without adopting the new value by pressing Manually). ESC. 7.4.3.9 Monitoring This setting determines how the Monitoring function will be handled. RHOTHETA Page 91 of 140 User Manual RT-500-M There are two possible settings in this menu (s. Figure 104). o To open the dialog for the Monitoring handling, press button OK or hotkey Edit Value, while the line Monitoring is marked. Choosing the Stays On setting Choosing the On/Off (User) setting Selecting the default value Figure 104. Monitoring handling settings o Choose the new setting using one of the hotkeys (s. Figure 104), which will then appear in the New Setting field. On/Off (User) The user can start and terminate the monitoring mode. Stays On The monitoring mode starts immediately after adopting this setting and the user cannot terminate this mode. To terminate the monitoring mode or change this setting the Administrator access is needed. o Press the hotkey Set Default to use the default value (On/Off by User). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. 7.4.3.10 PS Ram This setting defines if compass data should be used to compensate the Contouring Error inside the AU. Fast changes of the ships course can lead to a Contouring Error of the bearing indication, when the direction, shown on the bearing page, changes slowly compared to the vessels direction change. The reason is the averaging procedure of the phase summator inside the antenna unit. If an external compass is connected, the bearing value determination can be done by a special, improved compensating procedure (the PS Ram compensation), which eliminates the contouring error. For a compass of minor quality (e.g. heavy and quick variations) it may be necessary, to switch off the PS Ram compensation. o To open the dialog for the PS Ram handling, press button OK or hotkey Edit Value, while the line PS Ram is marked. RHOTHETA Page 92 of 140 User Manual RT-500-M Setting the PS Ram compensation to Comp. Off Setting the PS Ram compensation to Comp. On Figure 105. PS Ram compensation dialog Selecting the default value o Choose the new setting using one of the hotkeys (s. Figure 105), which will then appear in the New Setting field. Comp. On: The AU will use compass values to compensate the contouring error. Comp. Off: The AU will not use compass values to compensate the contouring error. o Press the hotkey Set Default to use the default value (Comp. On). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. 7.4.3.11 S/N Ratio AutoSQL [dB]

This value defines the Signal to Noise Ratio for the automatic squelch control inside the AU. S/N Ratio determines how many level-points the squelch marker is set above the noise level. If e.g. the value is 6, the squelch marker is always adjusted 6 level-points above the noise level, when the AutoSQL function is used. o By pressing the OK button or hotkey Edit Value, while the setting S/N Ratio AutoSQL [dB]

is marked, the following dialog is opened (s. Figure 106). Figure 106. S/N Ratio for auto squelch function o Use the number keys of the DCU keypad to enter the new value for the S/N Ratio. o Press the hotkey Set Default to use the default value of 6. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. 7.4.3.12 Scan Page Settings This value defines the effect of pressing OK on the Scan page. In every case, pressing OK will start a scan algorithm, if it was in a deactivated state, but with one setting the Scan page will stay open, and in the other case the Bearing page will be opened. RHOTHETA Page 93 of 140 User Manual Setting the Go to Bearing Page behavior Setting the Stay on Scan Page behavior RT-500-M o By pressing the OK button or hotkey Edit Value, while the setting Scan Page Settings is marked, the following dialog is opened (s. Figure 107). Selecting the default value Figure 107. Scan page settings dialog o Choose the new setting using one of the hotkeys (s. Figure 107), which will then appear in the New Setting field. OK: Stay: Pressing this hotkey defines that the Scan page should stay opened after starting a scan algorithm by pressing OK (on the Scan page). OK: Go to B.: Pressing this hotkey defines that the Bearing page should be opened after starting a scan algorithm by pressing OK (on the Scan page). o Press the hotkey Set Default to use the default value (OK: Stay on Scan Page). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. Interface 7.4.4 The setup menu Interface contains critical settings that influence important system parameters, therefore it is password protected and can be used by the administrator only. This page enables the user to configure the interfaces to external devices. It is possible to configure programmable IOs, LAN interface, interfaces to external compass and GPS. Furthermore, the user is able to configure the characteristics for remote control via NMEA commands. RHOTHETA Page 94 of 140 User Manual RT-500-M Figure 108. Setup page. Interface settings Indication on Setup Page, Interface Settings Pos. Element Edit Value Reset Values Meaning / Description Depending on currently marked line, using this hotkey will open the dialog for changing the corresponding value (s. descriptions below) Resets all values to the default settings. The default setting values cannot be changed by the user. When there is a dialog opened, pressing this button will close the dialog without adopting new values. When there is no dialog opened, pressing this button will go back to the last activated page. The Bearing page is the end point. Pressing this button always leads to the Bearing Page. Even an opened dialog will be closed, without adopting the changed values. Up and Down arrows are used to move between the display settings. Right and left arrows have no function inside the interface settings page. With the OK button confirming of values or opening the interface settings dialogs is accomplished. Inside the interface settings dialogs the DEL button is used to clear the whole input at once. On the top level of this page this button has no function. RHOTHETA Page 95 of 140 User Manual RT-500-M Numeric keys are used to enter the numerical characters inside the dialogs. On the top level of the page they have no function. Top line Navigation line of the screen, which allows switching between setup menus (General, Display, System, Interface and Service). Table 14. Setup page, interface settings. List of elements. 7.4.4.1 NMEA DF Remote It is possible to operate the RT-500-M direction finder remotely using the NMEA communication protocol. For this purpose, the control unit (e.g. ECDIS) can be connected to the NMEA interface of the DCU. o Additionally, by choosing the combination COMx1 / LAN, the NMEA sentences will be also sent via the LAN connection (s. Figure 109, position 3). Note If communication ports other than the default port (COM3) are not used, they will appear as hotkeys in the dialogs (as possible ports to use for the NMEA remote communication). And vice versa, when they are occupied, the corresponding hotkeys are not displayed. Note By default, the Autotalk mode is activated, which means that NMEA sentences of the direction finder are sent out cyclically with a fixed time period of 250 ms. The Autotalk mode can also be deactivated per corresponding NMEA command (s. NMEA-Protocol Description (RT-500-M & RT-800)) Configure the interface settings for remote control of the direction finder in this menu item. o Press the button OK or hotkey Edit Value, while the setting NMEA DF Remote is marked

(s. Figure 108). Following sub-menu will appear (s. Figure 109). Figure 109. NMEA DF remote control configuration 1 x stands for the number of the interface RHOTHETA Page 96 of 140 User Manual RT-500-M The NMEA DF remote configuration is accomplished by the following settings:

- Port

- Baudrate

- Remote Address ID NMEA supply voltage (12 V) is not configurable, but it is displayed there as information. Pressing the hotkey Reset Values (s. Figure 109, position 5) will set all menu items to default values. To exit the dialog confirming all changes that have been made within the sub-dialogs for single settings, press OK. Note Pressing ESC instead of OK when leaving the NMEA DF Remote Configuration dialog will discard all entered settings. Port This setting defines, which communication port is connected to the remote control PC. o For changing the communication port, press either the hotkey COMx (s. Figure 109, positions 1 and 2) or the hotkey Edit Value while the menu item Port is marked (s. Figure 109, position 4). Note that also the hotkey for COM1 can be displayed there if it is not used for other NMEA devices like e.g. compass. o Using the hotkey for COMx in the top level dialog NMEA DF Remote Configuration, changes the value of the Port setting without opening the corresponding dialog. o Pressing the hotkey LAN Yes/No (s. Figure 109, position 3) will turn on the additional communication over LAN (pressing this hotkey again will turn the LAN communication off, see also 7.4.4.2). If COMx and LAN are set for remote control, the priority between both is time-based. Example:

Commando for squelch comes via LAN. Commando for squelch comes via COM. First, the squelch level gets adjusted on the LAN command. During this time the message from the COM port is buffered. After that, the squelch level gets adjusted on the command from COM port. o Pressing the hotkey Edit Value while Baudrate is marked, opens the following sub-dialog

(s. Figure 110). RHOTHETA Page 97 of 140 User Manual RT-500-M Figure 110. Remote communication port configuration o Selecting COMx (s. Figure 110, positions 1, 2 and 3) configures the corresponding NMEA interface as the remote communication port. Choose the new setting using one of the hotkeys, which will then appear in the New Setting field. Note This setting will only set the corresponding communication port. Additional transmitting the NMEA sentences over LAN should be set in the top level menu (s. Figure 109, position 3). o Press the hotkey Set Default to use the default value. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. Baudrate Defines the speed of NMEA interface data transfer. The default value for the baud rate of the NMEA remote control is 9600. The baud rate can be changed using this menu item. For further information please see the document NMEA-Protocol Description (RT-500-M & RT-800). o To change the baud rate, press the hotkey Edit Value while the menu item Baudrate is marked (s. Figure 109). The corresponding sub-dialog will be opened (s. Figure 111). Figure 111. Remote control baud rate configuration o Use the number keys of the DCU keypad to enter the new value for the Baudrate. o Press the hotkey Set Default to use the default value of 9600. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. RHOTHETA Page 98 of 140 User Manual RT-500-M NMEA supply voltage Is not configurable (12 V, default), but it is displayed under the NMEA settings as information. Remote Address ID Is a setting, which is used to give the direction finder an address ID for the NMEA communication. The DF only reacts to the NMEA request sentences, if the address ID in the sentence is equal to the address, which is selected via this setting (or has the value 255, if the ID was not set). Note When using address ID = 255, then all connected DF systems are addressed, independent of their internal IDs. For further explanation please refer to the document NMEA-Protocol Description (RT-500-M & RT-

800). The address ID can take values between 0 and 99. Figure 112. Remote control address ID configuration o Use the number keys of the DCU keypad to enter the new value for the Address ID. o Press the hotkey Set Default to use the default value of 0. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. RHOTHETA Page 99 of 140 User Manual RT-500-M 7.4.4.2 LAN Configuration The RT-500-M DCU can be connected to the Local Area Network of the vessel. To configure the LAN interface of the DCU use the menu item LAN Configuration. o Press the button OK or hotkey Edit Value, while the setting LAN Configuration is marked

(s. Figure 108). Following sub-menu will appear (s. Figure 113). Figure 113. LAN configuration menu There are two settings necessary to configure the DCU for LAN communication:

- Mode of the IP address assignment

- The IP address Static IP 192.168.77.208 Pressing the hotkey Reset Values (s. Figure 113, position 4) will set all menu items to the default values. The default setting after the first booting of the system is:

Mode:

IP Address:

TCP Port for remote control: 9999 Mode The mode of the IP address assignment can be static or dynamic. If the mode is changed to dynamic, then the IP address is assigned dynamically by the DHCP server, which means that the DCU gets a random IP address that is currently free. It also means that the IP address can change at any time. The hotkey Edit Value disappears, if the setting IP Address is marked and Mode is currently set to dynamic. The presently assigned IP address can be viewed via the "IP Address" setting. If the mode is set to static, the IP address of the DCU must be set to a valid fixed value that is not occupied by any other user of the vessels LAN. Once assigned, the static IP address does not change anymore. o IP address assignment can be changed directly using the hotkeys Static IP and Dynamic IP

(positions 1 and 2, s. Figure 113), so that the value of this setting is changed without opening the dialog, or it can be set over the corresponding dialog after pressing the hotkey Edit Value

(s. Figure 113, position 3) while this menu point is marked, the following dialog opens (s. Figure 114). RHOTHETA Page 100 of 140 User Manual RT-500-M Choosing the Dynamic IP address assignment Choosing the Static IP address assignment Figure 114. Changing the mode of the IP address assignment Selecting the default value o Choose the new setting using one of the hotkeys (s. Figure 114), which will then appear in the o Press the hotkey Set Default to use the default value (Static IP). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing New Setting field. ESC. IP Address The IP address can be changed only if Mode is set to Static IP (dynamic IP address is assigned by the DHCP server). o For changing the IP address press the hotkey Edit Value while this menu point is marked (s. Figure 113, position 3). Following dialog opens (s. Figure 115). Figure 115. Setting the new IP address o Use the number keys of the DCU keypad to enter the new value for the IP Address setting. o Press the hotkey Set Default to use the default value 192.168.77.208. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. Caution Always reboot the DCU after changing the mode or IP address settings!

RHOTHETA Page 101 of 140 User Manual RT-500-M 7.4.4.3 NMEA Compass An external compass can be connected to the NMEA interface of the DCU. Configure the interface settings for external compass in this menu item. o Press the button OK or hotkey Edit Value, while the setting NMEA Compass is marked. Following sub-menu will appear (s. Figure 116). Figure 116. Compass configuration settings There are three settings necessary to configure the NMEA compass connection:

- Port

- Baudrate

- NMEA header NMEA supply voltage (12 V) is not configurable, but it is displayed there as information. Pressing the hotkey Reset Values (s. Figure 116, position 5) will set all menu items to default values. To go out of dialog confirming all changes, which have been made within the sub-dialogs for the single settings, press OK. Note Pressing ESC instead of OK leaving the NMEA Compass dialog, all previously configured changes of single settings will not be adopted. Port This setting defines, which communication port is connected to the external compass. o The communication port can be changed by pressing one of the three hotkeys No Compass, COM1 or COM2 (s. Figure 116, positions 1, 2 or 3) or the hotkey Edit Value while menu item Port is marked (s. Figure 116, position 4). Using the hotkeys 1, 2 or 3 on the top level dialog NMEA Compass Configuration (s. Figure 116), the value of the Port setting can be changed without opening the corresponding dialog. o Pressing the hotkey Edit Value the following sub-dialog will be opened (s. Figure 117). RHOTHETA Page 102 of 140 User Manual RT-500-M Figure 117. Compass connector setting o Choose the new setting using one of the hotkeys (s. Figure 117), which will then appear in the New Setting field. Selecting COM1 or COM2 (s. Figure 117, positions 2 and 3) configures the corresponding communication port as the input port for the external compass data. By choosing No compass setting (s. Figure 117, position 1), the external compass data will be ignored. No compass has to be selected, if no external compass is connected, in order to avoid displaying the corresponding warning on the Bearing page (No Compass warning). o Press the hotkey Set Default to use the default value (COM2). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. Baudrate Defines the speed of NMEA interface data transmission. The default value for baud rate of the NMEA interface is 4800, in compliance with the standard for NMEA 0183, version 3.01. The baud rate can be changed using this menu item. For further information please see the document NMEA-Protocol Description (RT-500-M & RT-800). o To change the baud rate, press the hotkey Edit Value while the menu item Baudrate is marked (s. Figure 116). The corresponding sub-dialog will be opened (s. Figure 118). Figure 118. Compass baud rate setting o Use the number keys of the DCU keypad to enter the new value for the Baudrate. RHOTHETA Page 103 of 140 User Manual RT-500-M o Press the hotkey Set Default to use the default value of 4800. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. NMEA Header Defines the appropriate compass NMEA sentence provided by vessels compass. Please see the compass documentation of the vessel. The default setting for the NMEA header is $xxHDT and can be changed within this menu item. In order to change the NMEA header setting, press the hotkey Edit Value while the menu item NMEA Header is marked (s. Figure 116). The corresponding sub-dialog will be opened

(s. Figure 119). o Selecting the

$xxHDT (true heading) header Selecting the

$xxHDG

(heading, deviation and variation) header Figure 119. Compass header setting Selecting the default value o Choose the new setting using one of the hotkeys (s. Figure 119), which will then appear in the New Setting field. ESC. o Press the hotkey Set Default to use the default value ($xxHDT). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing NMEA supply voltage (12 V, default) is not configurable, but it is displayed under the NMEA settings as information. RHOTHETA Page 104 of 140 User Manual RT-500-M 7.4.4.4 NMEA GPS The RT-500-M DCU is able to read external GPS data via a defined NMEA protocol. Connect the external GPS device to one of the NMEA interfaces of the DCU. The GPS data format can be configured in this menu. o Press the button OK or hotkey Edit Value, while the setting NMEA GPS is marked (s. Figure 108). Following sub-menu will appear (s. Figure 120). Figure 120. NMEA GPS configuration settings The NMEA GPS configuration is accomplished by the following settings:

- Port

- Baudrate values. settings, press OK. NMEA supply voltage (12 V) is not configurable, but it is displayed there as information. o Pressing the hotkey Reset Values (s. Figure 120, position 5) will set all menu items to default o To exit the dialog confirming all changes that have been made within the sub-dialogs for single Note Pressing ESC instead of OK when leaving the NMEA GPS Configuration dialog, all previously configured changes of single settings will be discarding. RHOTHETA Page 105 of 140 User Manual RT-500-M Port This setting defines, which communication port is connected to the external GPS device. Figure 121. NMEA GPS communication port settings o By selecting No GPS (s. Figure 121, position 1) the external GPS data will be ignored. o Selecting COMx 1 (s. Figure 121, positions 2 and 3) configures the corresponding NMEA interface as the GPS communication port. Choose the new setting using one of the hotkeys, which will then appear in the New Setting field. o Press the hotkey Set Default (s. Figure 121, position 4) to use the default value. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. Baudrate Defines the speed of NMEA GPS interface data transfer. The default value for the baud rate of the NMEA GPS communication is 4800. The baud rate can be changed using this menu item. For further information please see the document NMEA-Protocol Description (RT-500-M & RT-800). o To change the baud rate, press the hotkey Edit Value while the menu item Baudrate is marked (s. Figure 120). The corresponding sub-dialog will be opened (s. Figure 122). Figure 122. Changing the NMEA GPS baud rate setting 1 x stands for the number of the interface RHOTHETA Page 106 of 140 User Manual RT-500-M o Use the number keys of the DCU keypad to enter the new value for the Baudrate. o Press the hotkey Set Default to use the default value of 4800. o Confirm the setting with OK or leave the dialog without adopting the new value by pressing ESC. NMEA supply voltage Is not configurable (12 V, default), but it is displayed under the NMEA settings as information. 7.4.4.5 GPIOs (Power S. Connector) With this setting, the behavior of the two programmable GPIOs can be defined. The power supply connector (POWER + IO, s. chapter 8.1) provides the programmable IN and the programmable OUT lines, where different signals can be provided. o In order to define, which signals are to be allocated to the IOs, select the setting GPIOs

(Power S. Connector) (s. Figure 108) and press OK or the hotkey Edit Value. The following dialog appears (s. Figure 123. Dialog for setting the GPIOs). Figure 123. Dialog for setting the GPIOs Input (Pin 2) A signal can be allocated to the programmable IN pin (s. chapter 8.1, POWER + IO). There are two setting possibilities for this pin:

1. PTT: This setting defines Pin 2 as a source for the PTT signal. The software will look for PTT signal at this pin as well as at the actual PTT input pin (s. chapter 8.1, POWER + IO). Both sources are valid as PTT source. 2. No Function: This setting means that the pin will not be related to any function. o To configure the programmable input pin, press the hotkey Edit Value, while the setting Input

(Pin 2) is marked. RHOTHETA Page 107 of 140 User Manual RT-500-M Assigning the PTT signal to the input pin Assigning No Function signal to the input pin Figure 124. Assigning a function to the input pin Selecting the default value o Choose the new setting using one of the hotkeys (s. Figure 124), which will then appear in the New Setting field. ESC. o Press the hotkey Set Default to use the default value (PTT). o Confirm the setting with OK or leave the dialog without adopting the new value by pressing Output (Pin 10) A signal can be allocated to the programmable pin OUT (s. chapter 8.1, POWER + IO). There are four setting possibilities for this pin:

1. Alarm Out: Choosing this setting connects the programmable output pin with the pin for the alarm relay (s. Figure 125, position 2). 2. Squelch Out: Choosing this setting (s. Figure 125, position 3) connects the programmable output pin with the Squelch Out pin of the POWER + IO connector (s. chapter 8.1). 3. Status Out: Choosing this setting connects the programmable output pin with the internal error status output of the device (s. Figure 125, position 4). That means, if there are no errors, the output will be active (open collector). If there is an error, the output will be not active (open collector). 4. No Function: Choosing this setting allocates the state No Function to the programmable pin, which means that the pin is not related to any function (s. Figure 125, position 1). o To configure the programmable output pin, press the hotkey Edit Value, while the setting Input (Pin 2) is marked. Figure 125. Assigning a function to the output pin RHOTHETA Page 108 of 140 User Manual RT-500-M o Choose the new setting using one of the hotkeys (s. Figure 125), which will then appear in the New Setting field. Out). ESC. o Press the hotkey Set Default (s. Figure 125, position 5) to use the default value (Alarm o Confirm the setting with OK or leave the dialog without adopting the new value by pressing RHOTHETA Page 109 of 140 User Manual RT-500-M 7.4.5 Service The Service menu allows the performing of the service-related functions, like e. g. updating of the DCU software, inputting the new license code if new options have been purchased, etc. Note The setup menu Service contains critical settings that influence important system parameters, therefore it is password protected and can be used only with the administrator access level. Figure 126. Setup page. Service menu Indication on Setup Page, Service Menu Pos. Element Top line Meaning / Description Navigation line of the screen, which allows switching between setup menus (General, Display, System, Interface and Service). Update DCU Opens a dialog to start a software update for the DCU (s. 7.4.5.1). Input License Opens a dialog to input a new license code (s.7.4.5.2). Export Log Opens a dialog to export log files to USB (s. 7.4.5.3). Load Config Opens a dialog to import configuration files from USB (s. 7.4.5.4). Export Conf. Opens a dialog to export configuration files to USB (s. 7.4.5.5). Table 15. Service menu. List of elements. After opening the Service menu by pressing the corresponding hotkey, while on the Setup page, an information view of the current system parameters opens. Those are the most important working parameters of the AU and DCU, such as temperature or voltage of different functional blocks. RHOTHETA Page 110 of 140 User Manual RT-500-M 7.4.5.1 Update DCU The Update DCU dialog is opened by pressing the corresponding hotkey when the service menu is opened (s. Figure 126, position 2). To load new software use the USB interface (s. chapter 6.2, Figure 7, position 11). The function of this dialog is the updating of the DCU software, if a new version is available. In such a case the dialog has the following appearance (s. Figure 127). Note In the case of unavailability of the new software version, the dialog will merely show the current version without the possibility to take any action inside the dialog. The hotkey Start Update appears, if a flash drive with a valid software version has been detected. The new software version is then displayed in the dialog under the label New Version. Figure 127. Update DCU dialog, new version available o Pressing the hotkey Start Update will start the update from USB. During the update, the text of the hotkey changes to Update (s. Figure 128) and the warning at the top of the display appears. Figure 128. Update DCU in progress After a successful update the button name turns back to Start Update. RHOTHETA Page 111 of 140 User Manual RT-500-M Figure 129. Update of the DCU software finished o Confirm the new software version with OK to leave the dialog. Caution Please always restart the device after the new software version was uploaded!

After the restart of the DCU, the indication of the new software version under the menu General (s. Figure 130) can be checked. Figure 130. Update DCU control on the "General" page Input License 7.4.5.2 If a new license code has been provided to you by RHOTHETA, you can input it using this dialog. The Input License dialog is opened by pressing the corresponding hotkey when the service menu is opened (s. Figure 126, position 3). o You can input the new license either manually or load it from the USB flash drive. o Use arrow buttons of the keypad to navigate between letters of the virtual keyboard in the license input dialog (s. also description of using the virtual keyboard in 7.4.1.5). o Use the number keys of the DCU keyboard for input of the numbers. RHOTHETA Page 112 of 140 User Manual RT-500-M Figure 131. Input license dialog o In order to load the license file from USB, after connecting the flash drive at the USB port (refer to chapter 6.2), press the hotkey From USB. The software will search for a valid license code on the flash drive. If a valid license has been found, the license text will be displayed in the license input field. o After a valid license code was inputted, the device will show the message Valid License! and ask for confirming the action of adopting the new license (s. Figure 132). Figure 132. Input of a new license from USB o After confirming the new valid license with OK, a dialog will be opened, which shows the licensed frequency bands (s. Figure 133). Figure 133. New license adopted RHOTHETA Page 113 of 140 User Manual RT-500-M 7.4.5.3 Export Log Files This dialog allows the export of the log files via USB (refer to chapter 6.2). Each log file has a header with the following information:

- Serial number of DCU

- Serial number of AU

- Software version of DCU

- Software version of AU

- Operating hours of DCU The Export Log dialog is opened by pressing the corresponding hotkey when the service menu is opened (s. Figure 126, position 4). Opens a prompt for deleting all log files Opens a prompt for deleting the selected log file Stores the marked log file into the flash drive Stores all log files into the flash drive Figure 134. Export Log dialog o Pressing the hotkey Delete Log will open the following window (s. Figure 135). Pressing OK will delete the currently marked file. Pressing ESC will close the dialog without deleting the log file. Figure 135. Confirming the deleting of the log file o Pressing the hotkey Delete All will open the prompt dialog for deleting of all log files (s. Figure 136). Pressing OK will delete all log files. Pressing ESC will close the dialog without deleting the log files. RHOTHETA Page 114 of 140 User Manual RT-500-M Figure 136. Confirming of deleting of all log files o The hotkey Export File is only visible, if a valid log file is marked and the USB flash drive was detected. By pressing this hotkey, the log file will be stored in the flash drive. After a successful export of the log file, the hotkey name becomes gray. It is also gray, if a log file is marked, that has been already exported. The same export cannot be repeated without re-opening the dialog. Figure 137. Exporting a log file finished o The hotkey Export All is only visible, if there is at least one valid log file and the USB flash drive was detected. By pressing this hotkey, all available log files will be stored into the flash drive. Figure 138. Exporting of all log files is in progress After a successful export of log files, the hotkey name becomes gray. The same export cannot be repeated without re-opening the dialog. RHOTHETA Page 115 of 140 User Manual RT-500-M 7.4.5.4 Load Configuration Files This dialog allows the import of the configuration files into the RT-500-M DCU. The hotkey Load Config (s. Figure 126, position 5) is activated only if the USB flash drive was detected. Pressing this hotkey will open the following sub dialog (s. Figure 139). Starts importing of the marked configuration file into the DCU Starts importing of all available configuration files Figure 139. Importing a log file o The hotkey Import File is only visible, if a valid configuration file is marked. Pressing this hotkey will start importing the marked configuration file from the USB flash drive. After successful import of the file, the hotkey name becomes gray (s. Figure 140). Figure 140. File imported The import of the same configuration file cannot be repeated without re-opening the dialog. RHOTHETA Page 116 of 140 User Manual RT-500-M o The hotkey Import All is only visible, if there is at least one valid configuration file on the connected USB flash drive. Pressing this hotkey will start importing all valid configuration files from the flash drive. After the successful import of the files, the hotkey name becomes gray. Figure 141. Importing of all files The same import cannot be repeated without re-opening the dialog. 7.4.5.5 Export Configuration Files This dialog is used to select configuration files from the internal memory for exporting them to a USB flash drive (refer to chapter 6.2). The hotkey Export Conf. (s. Figure 126, position 6) is activated only if the USB flash drive was detected. Pressing this hotkey will open the following sub dialog (s. Figure 142). Starts exporting of the currently marked configuration file Starts exporting of all available configuration files Figure 142. Export configurations dialog o The hotkey Export File is only visible, if the currently marked configuration file is labeled with Public. Pressing this hotkey starts exporting the configuration file to the USB flash drive. RHOTHETA Page 117 of 140 User Manual RT-500-M Figure 143. Export of a single file After a successful export of the file, the name of the hotkey becomes gray. The same export cannot be repeated without re-opening the dialog. o Pressing the hotkey Export All will start importing all valid (public) configuration files to the flash drive. Figure 144. Export of all configuration files After the successful import of the files, the hotkey name becomes gray. The same export cannot be repeated without re-opening the dialog. RHOTHETA Page 118 of 140 User Manual RT-500-M 7.5 Other Operational Functions 7.5.1 Adjusting the Volume The volume adjustment button

(twin function key). Pressing any of the two keys opens the dialog for adjustment of internal and external speaker.

(s. Figure 6, position 3) contains two keys: + and -

Figure 145 "Adjust External Speaker Volume Dialog"

Use hotkey Min. (s. Figure 145, position 1), Medium (Figure 145, position 2) and Max. (Figure 145, position 3) in order to set an appropriate volume. Use hotkey Test On/Off (Figure 145, position 4) in order to test volume. To switch the volume on/off quickly, use the mute-button

(s. Figure 6, position 4). RHOTHETA Page 119 of 140 User Manual RT-500-M 7.5.2 Adjusting of the Squelch The correct adjustment of the squelch is crucial for attaining the optimal sensitivity of the signal reception. The more sensitively the system works, the greater signal range (operating distance) can be achieved. Especially weak signals are often located on the edge to the noise level or even inside the noise level. Therefore, it is very important to continuously check the squelch level setting and adjust it to the given signal strength and environmental situation in order to use the direction finder system to the full capacity of performance. o Pushing the button following dialog:

+ or - (twin function key, s. Figure 6, position 6): opens the Figure 146. Squelch Dialog o Pushing the arrow keys allows switching between the frequencies (green frame the squelch can be adjusted manually to the desired level in indicates the currently chosen frequency). With the arrow keys one-percent-steps. It is also possible to set the squelch level for the main frequency automatically, according to the received signal level. To use this function, push the hotkey Autoset SQL (s. field A). The squelch can also be turned to the zero level, e.g. for the purpose of receiving very weak signals, which are hidden in the noise. The turning off of the squelch is accomplished by pressing the Off-hotkey (s. field B). To apply the function of the automatic squelch adjusting to all the stored frequencies press the hotkey Autoset All (s. field C). RHOTHETA Page 120 of 140 User Manual RT-500-M 7.5.3 Dimming The brightness of the display and key illumination can be adapted to surrounding lighting conditions. The button brightness of:

(twin function key, s. Figure 6, position 5) has two keys (-, +) to adjust the

- Backlight of the display

- Backlight of the keypad legends

- LEDs Pressing one of these keys will open a dialog with a brightness indication and already decrease or increase the brightness. The brightness can be adjusted in the manual mode as well as in the automatic dimming mode, which is coupled with the light sensor. Further, the dialog shows the current level of the light sensor. Figure 147 "Adjust Brightness Dialog"

o Use hotkey Mode (s. Figure 147, number 1) to select between:

Display LEDs Legends and All o Use the hotkey Min. (s. Figure 147, position 2), Medium (s. Figure 147, position 3) and Max. (s. Figure 147, position 4) in order to set the appropriate luminosity. o Use the hotkey Auto/Manual (s. Figure 147, position 5) in order to set auto or manual luminosity adjustment mode. In the auto mode the luminosity of items will be adjusted automatically based on the light-

sensor value. RHOTHETA Page 121 of 140 User Manual RT-500-M Figure 148. Deactivation of the illumination of legends o The hotkey Off (s. Figure 148, number 6) is only available if the Mode is set to Legends. Pressing this hotkey deactivates the illumination of the legends. RHOTHETA Page 122 of 140 User Manual RT-500-M 7.5.4 MOB (Man Over Board) Operation The MOB function is useful to save the current GPS position when a person goes overboard. This possibility helps to rescue a person in the water, even if the person does not have a personal locator beacon by just pressing the MOB button (s. Figure 6, position 7) on the keypad at the right time. The following figure demonstrates the functionality in case of the person in the water, who has an emergency beacon operating on 121.500 MHz (121.650 as training frequency) and the MOB function has been triggered. Figure 149 "The MOB direction overlays the bearing The magenta arrow (slim), which overlays the bearing arrow (the bigger red arrow) shows the direction to the GPS position which has been saved by the MOB function. Simultaneously the RT-500-M displays the Doppler based bearing of the radio signal which comes from the PLB (Personal Locator Beacon). The distance (here Dis: 0.24 km) between the saved GPS position and the current GPS position is numerically indicated in the central digital display. The MOB function can be triggered manually or by the ELT/PLB or beep tone detection. If the MOB mode is started manually (by pressing the MOB button) the corresponding MOB dialog will be opened. If the MOB mode is started automatically (ELT/PLB or beep tone detection), the MOB dialog will not be opened, but the MOB position will be automatically adopted. All corresponding settings regarding triggering the MOB function can be found in the setup menu (see chapter 7.4.3.8). Note The basic requirement for opening MOB dialog is that the GPS data from an external GPS device is available. The following figure shows the Man Over Board dialog. RHOTHETA Page 123 of 140 User Manual RT-500-M Figure 150. "Man Over Board dialog o Press Quit MOB (s. Figure 150, position 1) to quit the dialog. This hotkey is used to quit the MOB mode. By pressing this hotkey an extra dialog will appear for additional confirmation. o Press Save (s. Figure 150, position 2) to save the current GPS position. Pressing this hotkey will save the new GPS position and move the line with the new position above the current position. Furthermore, the new position will be shown gray as it has not been adopted for MOB mode. o Select the line with the appropriate saved GPS Position and press OK to display the corresponding GPS based calculations (distance and true bearing) on the bearing display. o Press Clear All (s. s. Figure 150, position 3) to delete all saved positions. RHOTHETA Page 124 of 140 User Manual RT-500-M Interfaces and Installation 8 8.1 Power & I/O Contact

/ Pin Signal 15

+12 V to +30 VDC Input power supply Note Ground of power supply is connected to housing with an anti-

interference device. Optional input: External power on When applying a voltage > approx. 2 VDC the device will be put into permanent operation independent of key On/Off.

(Most simple activation: Connection / bridge Pin 7 Pin 15) Optional input in order to suppress self-bearing. When connecting input PTT/SBS (Self Bearing Suppression) to Ground, self-bearing is suppressed. When receiving a signal this pin is connected to ground (active) by the means of an open collector output. Max. current 200 mA. Optional alarm contact (mechanical relay as NOC, Normal opening contact) max. 1 A at 30 VDC resp. max. 0.3 A at 125 VAC Pin 1 = COM; Pin 4 = NC; Pin 9 = NO Optional connection of external speaker. Impedance of speaker: 4...600 , UMax: 8 VSS, Power: 1.5 WMax Note The audio exit is a symmetric push-pull amplifier. This inhibits, that none of the speaker signals are to be connected to the ground. Symmetric Audio exit

(adjustable in menu, from 200 mVSS at 10% to max. 2 VSS at 99%, 600 Ohm) Optional programmable input:

- PTT

- No function To activate connect to GND. Optional programmable exit (open collector):

GND (Ground) Permanent Operation PTT / SBS GND Squelch Out Alarm Relay Speaker +

Speaker -

Audio Line Out Audio Line Out Programmable IN

(Electrical identical to PTT) Programmable OUT

(Electrical identical to Squelch Out)

- Alarm

- Status (see DCU)

- No function Max. current 200 mA. 8 7 14 6 12 4 1 9 3 11 13 5 2 10 RHOTHETA Page 125 of 140 User Manual RT-500-M Table 16. "Power & I/O Connector"

8.2 Antenna Unit (Connecting Cable DCU AU ) 8.2.1 Pinning Antenna Unit Connector Contact

/ Pin Signal 3 8 5 9 1 6 2 7

+12 to +30 V DC Output - Power supply Antenna Unit GND RS485 A RS485 B NF GND Serial data connection DCU AU

(9600 Baud / semi-duplex / receive and transmit) Input audio signal resp. analog Test/Service (symmetric optional) Input audio symmetric (OPTIONAL) Table 17. "Pinning of the AU Connector"

8.2.2 Connecting Cable DCU AU RHOTHETA Art. No. X-1067 Connection Antenna Unit Connector type:

RHOTHETA Article Number X-1067 RHOTHETA connecting cable 6-poled with shield length 1 to100 m:

6 x 0.50 mm2 cross -section of conductor min. Connection Display Control Unit Connector type:

SubD 9-poled male Page 126 of 140 User Manual RT-500-M 8.3 NMEA COM-Interfaces All 3 COM-Interfaces COM1, COM2, and COM3 have the same pinning. These interfaces should be used for connection of

- COMPASS of the vessel

- GPS Receiver

- ECDIS (Remote Control) Note When connecting to input use either RS232 Rx or RS422 Rx (not both)!

Contact

/ Pin 2 3 5 6 1 7 8 4 9 Signal RS232 Tx RS232 Rx Output of serial data with RS232 level Input of serial data with RS232 level GND GND level for RS232 connection RS422 Tx / A RS422 Tx / B RS422 Rx / A RS422 Rx / B NC Power Output of serial data with RS422 level NMEA 0183 TX Input of serial data with RS422 level (isolated) NMEA 0183 RX Not connected Output - Power supply for GPS / Compass (12V) Table 18. "Pinning of NMEA Connectors"

Note Per default the Autotalk mode is activated, which means that NMEA sentences of the direction finder are sent out cyclically with a fixed time period of 250 ms. The Autotalk mode can also be deactivated per corresponding NMEA command (s. NMEA-Protocol Description (RT-500-M & RT-800)). RHOTHETA Page 127 of 140 User Manual RT-500-M 8.4 LAN Interface The LAN interface can be used for connection of ECDIS or other Remote and Control Devices. The RT-500-M can be controlled via the same NMEA sentences which are available on COM Port in DF remote control configuration. Note Per default the Autotalk mode is activated, which means that NMEA sentences of the direction finder are sent out cyclically with a fixed time period of 250 ms. The Autotalk mode can also be deactivated per corresponding NMEA command (s. NMEA-Protocol Description (RT-500-M & RT-800)). Contact

/ Pin 1 2 3 4 5 6 7 8 Signal TX+_D1 TX-_D1 RX+_D2 BI+_D3 BI-_D3 RX-_D2 BI+_D4 BI-_D4 Transmit Data+ (10/100BaseT) Transmit Data- (10/100BaseT) Receive Data+ (10/100BaseT) Bi-directional+ (not used) Bi-directional- (not used) Receive Data- (10/100BaseT) Bi-directional+ (not used) Bi-directional- (not used) Table 19. "Pinning LAN Connector"

RHOTHETA Page 128 of 140 User Manual RT-500-M 8.5 USB Service Interface The USB 2.0 connector is used only for service purposes. Contact

/ Pin 1 2 3 4 5 Signal VBUS USB D-

USB D+

NC GND

+5V USB 2.0 Diferental pair USB 2.0 Diferental pair Not connected Ground Figure 151. Pinning USB 8.6 Ground Connector The ground connector (s. Figure 7, position 8) is used to connect the DCU to ground of the ship. For the connection a screw M5 is required and a cable to ground with a cross-section of 4 mm is recommended. RHOTHETA Page 129 of 140 User Manual RT-500-M 8.7 Guideline for Optimal DF Antenna Position The quality of the bearing results depends largely on the antennas location. So, an antenna location has to be found where the transmitters wavefield can reach the bearing antenna as undisturbed as possible. If high bearing accuracy is demanded, no metallic resp. RF-conducting obstacles may be around the antenna unit (in an angle of 45 towards the horizontal). Objects being in the restricted area will disturb the arriving wave field. Reflections will arise which might disturb bearing accuracy and so on decrease the bearing accuracy. This physical effect generally is valid for all bearing systems. In practice, often a compromise has to be found between bearing and other interests. Figure 152. "Example of Optimal DF Antenna Position"

RHOTHETA Page 130 of 140 User Manual RT-500-M 9 Technical Data 9.1 Electrical Characteristics System Characteristics Parameter Method of Bearing Bearing Accuracy Display Resolution Minimum Signal Duration Condition Data VHF Air Band VHF Marine Band Doppler (3 kHz rotation frequency) 5 RMS1 1 100 ms 118.000 124.000 MHz 118.000 136.992 MHz (Option F1) 154.000 163.000 MHz 137.000 224.995 MHz (Option F2) 240.000 246.000 MHz 225.000 399.975 MHz (Option F3) Frequency Range UHF Air Band COSPAS-SARSAT 400.000 406.092 MHz UHF FM-Band VHF Air Band Marine Band UHF Air Band 406.100 410.000 MHz 406.100 470.000 MHz (Option F4) 8.33 kHz 5 kHz 25 kHz COSPAS-SARSAT 8.33 kHz UHF FM-Band 5 kHz VHF Air Band Marine Band Extended Marine Band above 174 MHz 4 V/m / 2.5 V/m typical 3 V/m / 2 V/m typical 5 V/m / 3 V/m typical UHF Air Band 6 V/m / 4 V/m typical COSPAS-SARSAT 6 V/m / 4 V/m typical UHF FM-Band 6 V/m / 4 V/m typical Receive Frequency Tuning Steps Bearing Sensitivity Continuous Signal

(5 bearing fluctuation) RHOTHETA Page 131 of 140 User Manual System Characteristics Parameter Bearable Types of Modulation Polarization Scanning COSPAS-SARSAT Functionality TFT Graphic Display Audio Operating Voltage Power Consumption Current Consumption Interfaces RT-500-M Condition Data A3E, F3E, A3X (distress signal modulation) Vertical Multiple scanning and monitoring functions available Decoding of COSPAS-SARSAT Message: shows beacon ID, GPS position and whole message string

(short and long). Displays direction and distance to beacon 2. 5 (127 mm), 24 bit RGB 800 x480 x 3 dots Max. brightness 700 cd/m Dimming: manual and automatic Internal Speaker External Speaker 1 W, 4 Ohm 1 W, 4 Ohm Line out Adjustable from 200 mVpp to 2 Vpp 12 V to 30 V DC Max.: 15 W Typical: 8 W Stand-by: 7 W Max. 1.5 A 3x NMEA 0183 (RS422) | 3x RS232 Ethernet LAN (NMEA over LAN) Test port (RS-232) Alarm Relay Output (2A, 30 V DC /

0,3 A, 125 V AC) PTT input for self-bearing suppression Squelch output for external audio controlling 2 x programmable I/O Ports USB 2.0 for service purposes Table 20. Electrical Characteristics 1 Measured with un-modulated, undisturbed wave field at field strength 20 dB above sensitivity level by changing the angle of incidence with the antenna rotating on a revolving table in order to eliminate environmental influences on the results. 2 If GPS data is available.at NMEA interface RHOTHETA Page 132 of 140 User Manual RT-500-M 9.2 Mechanical Characteristics 9.2.1 Mechanical Data Figure 153. DCU and AU mechanical dimensions Measuring units: millimetres [mm]

Mechanical Characteristics Parameter DCU AU Weight 1500 g (3.3 lbs) 5200 g (11.5 lbs) Operating Temperature

-20 C to +60 C (-4 F to +140 F)

-40 C to +60 C (-4 F to +140 F) Storage Temperature

-55 C to +80 C (-67 F to +176 F)

-55 C to +80 C (-67 F to +176 F) Ingress Protection Max. Wind Speed IP67

-

IP67 270 km/h Table 21. Mechanical Characteristics RHOTHETA Page 133 of 140 User Manual 9.2.2 DCU Mounting Cutout RT-500-M Figure 154. DCU mounting cutout Measuring units: [mm] millimetres 9.2.3 AU Mast Flange Figure 155. Antenna unit mast flange. Mechanical dimensions. Measuring units: [mm] millimetres RHOTHETA Page 134 of 140 User Manual 19321010680R8.54.510651055040.7120906.3 RT-500-M 10 Disposal within the European Union Product Recycling Product labeling in accordance with EN 50419 At the end of the life of the product, this product may not be disposed of with normal household waste. Even disposal via the municipal collection points for electrical and electronic equipment is not allowed. The correct disposal of this product will help to conserve resources and prevent potential negative effects on the environment and human health which may occur due to improper handling of the product. Therefore, carry out the inoperative device, an electronics recycling. or The RHOTHETA Elektronik GmbH takes back all its products, subject to redemption, in accordance with the requirements of the WEEE Directive (2012/19 / EC) of the European Union to deliver it to a professional disposal. 11 Disposal outside the European Union For proper disposal of used electronic equipment in accordance with the respective national regulations in countries outside the European Union please check it with your dealer or the local authorities. RHOTHETA Page 135 of 140 User Manual RT-500-M 12 Maintenance and Cleaning 12.1 Maintenance UV irradiation can age the front foil of the RT-500-M DCU with time, which can lead to brittleness of the front foil. Depending on the operating conditions of the RT-500-M DCU, there is the possibility that moisture can penetrate through small hairline cracks in the front foil. An impairment of the functionality up to the damage of the product can result. The exchange of the front foil may only be done by RHOTHETA Elektronik GmbH or an authorized maintenance facility; otherwise this will void the warranty. 12.2 Cleaning RHOTHETA Elektronik recommends cleaning the RT-500-M with warm water and a microfiber cloth. Persistent stains can be washed with a dishwashing detergent. Do not use any abrasives or cleaning agents containing alcohol. RHOTHETA Page 136 of 140 User Manual 13 Appendix 13.1 Error Messages Error location Error message Antenna Unit:

Error 01 AU No Receiver Receiver Error 04 AU Rec. No PLL Antenna Connection Error 05 DCU>AU No Data Display Antenna Connection Error 06 DCU>AU BadData Display Antenna Error 07 AU Low Voltage Main voltage supply Error 08 AU>DCU BadData Connection Antenna Display Connection Antenna Display RT-500-M Cause defective receiver circuit board in AU Error in receiver synthesizer oscillator in AU No serial data from DCU to AU Incompatible respective bad data connection between DCU and AU Voltage supply below 10 V Incompatible respective bad data connection between AU and DCU No serial data (RS485) from AU Missing or damaged cable connection between AU and DCU respective defective AU Error 09 No AntennaUnit 13.2 Warnings Warning message Warning 01 AU low Voltage Warning 02 NoCompassFound Warning 10 NMEA DataRange Warning 11 NMEA Bad Data Warning 12 NMEA CheckSum Warning 13 NMEA Bad Frame Warning 20 AU DataRange Warning 21 AU Decode Err Warning 22 Send Freq.Ofs-

Warning 23 Send Freq.Ofs+

Warning 30 FLASH Config Error location Main voltage supply Cause Low voltage supply of AU External device External device External device External device External device Connection Display Antenna Radio distance transmitter direction finder Received transmitter Received transmitter DCU Flash memory Compass data not available Incorrect NMEA data: Value out of allowed range Defective data recognized on NMEA interface Defective data recognized on NMEA interface:

Check Sum Defective data recognized on NMEA interface: Bad Frame Bad data of DCU, mismatch of telegram length Data error in Cospas-Sarsat data block, data could not be decoded. Frequency of transmitter too low Frequency of transmitter too high The stored settings cannot be read (device is operating with default settings). RHOTHETA Page 137 of 140 User Manual RT-500-M 13.3 Frequencies of Channels in Marine Band Channel frequency (ship - station) Frequency (coast - station) No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 156,400 MHz 156,450 MHz 156,500 MHz 156,550 MHz 156,600 MHz 156,650 MHz 156,700 MHz 156,750 MHz 156,800 MHz 156,850 MHz 156,375 MHz 156,425 MHz 156,475 MHz 156,525 MHz 156,575 MHz 156,625 MHz 156,675 MHz 156,725 MHz 156,775 MHz 156,825 MHz 156,875 MHz 160,600 MHz 160,650 MHz 160,700 MHz 160,750 MHz 160,800 MHz 160,850 MHz 160,900 MHz 160,950 MHz 161,500 MHz 161,550 MHz 161,600 MHz 161,650 MHz 161,700 MHz 161,750 MHz 161,800 MHz 161,850 MHz 161,900 MHz 161,950 MHz 162,000 MHz 160,625 MHz 160,675 MHz 160,725 MHz 160,775 MHz 160,825 MHz 160,875 MHz 160,925 MHz 161,525 MHz 161,575 MHz 161,625 MHz 161,675 MHz 161,725 MHz 161,775 MHz 161,825 MHz 161,875 MHz 161,925 MHz 161,975 MHz 162,025 MHz 156,000 MHz 156,050 MHz 156,100 MHz 156,150 MHz 156,200 MHz 156,250 MHz 156,300 MHz 156,350 MHz 156,900 MHz 156,950 MHz 157,000 MHz 157,050 MHz 157,100 MHz 157,150 MHz 157,200 MHz 157,250 MHz 157,300 MHz 157,350 MHz 157,400 MHz 156,025 MHz 156,075 MHz 156,125 MHz 156,175 MHz 156,225 MHz 156,275 MHz 156,325 MHz 156,925 MHz 156,975 MHz 157,025 MHz 157,075 MHz 157,125 MHz 157,175 MHz 157,225 MHz 157,275 MHz 157,325 MHz 157,375 MHz 157,425 MHz RHOTHETA Page 138 of 140 User Manual RT-500-M 13.4 Abbreviations Meaning Abbreviation Antenna Unit AU CP/SS Cospas-Sarsat Display & Control Unit DCU Direction finder DF Degree ( = 60' ) Deg ELT Emergency Locator Transmitter Ground GND Global Positoning System GPS Identification ID IP Ingress Protection rating Local Area Network LAN Liquid Crystal Display LCD LED Light-Emitting Diode Man-Over-Board MOB Maritime Mobile Service Identity MMSI Audio Frequency NF NMEA (0183) National Marine Electronics Association Personal Locator Beacon PLB Averaging Random Access Memory PS RAM Push-To-Talk/ Self Bearing Suppression PTT/SBS RAM Random Access Memory Receiver Rx Signal to Noise S/N Search And Rescue SAR SNR Signal to Noise-Ratio Squelch SQL Thin Film Transistor (see also LCD) TFT Tx Transmitter Volts of Direct Current VDC VTS Vessel Traffic Service Remarks IP67 Ship's Ident. No. Interface- and data telegram standard RHOTHETA Page 139 of 140 User Manual RT-500-M 14 Notes RHOTHETA Page 140 of 140 User Manual

External photographs of equipment under test (EUT - Antenna Unit (AU)) Rogers Labs, Inc. 4405 W. 259th Terrace Louisburg, KS 66053 Phone/Fax: (913) 837-3214 Test to: CFR47 15, RSS-210, RSS-135 Revision 1 RHOTHETA International Inc. Model: RT-500-M Test: 190211A File: RT500M ExtPho S/N: 00781 FCC ID: 2ASLJRT500M IC: 24836-RT500M Date: October 31, 2019 Page 1 of 4 Rogers Labs, Inc. 4405 W. 259th Terrace Louisburg, KS 66053 Phone/Fax: (913) 837-3214 Test to: CFR47 15, RSS-210, RSS-135 Revision 1 RHOTHETA International Inc. Model: RT-500-M Test: 190211A File: RT500M ExtPho S/N: 00781 FCC ID: 2ASLJRT500M IC: 24836-RT500M Date: October 31, 2019 Page 2 of 4 Rogers Labs, Inc. 4405 W. 259th Terrace Louisburg, KS 66053 Phone/Fax: (913) 837-3214 Test to: CFR47 15, RSS-210, RSS-135 Revision 1 RHOTHETA International Inc. Model: RT-500-M Test: 190211A File: RT500M ExtPho S/N: 00781 FCC ID: 2ASLJRT500M IC: 24836-RT500M Date: October 31, 2019 Page 3 of 4 Accessary (Display Control Unit (DCU)) Rogers Labs, Inc. 4405 W. 259th Terrace Louisburg, KS 66053 Phone/Fax: (913) 837-3214 Test to: CFR47 15, RSS-210, RSS-135 Revision 1 RHOTHETA International Inc. Model: RT-500-M Test: 190211A File: RT500M ExtPho S/N: 00781 FCC ID: 2ASLJRT500M IC: 24836-RT500M Date: October 31, 2019 Page 4 of 4