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1 2 | User Manual | Users Manual | 3.28 MiB | October 02 2020 |
Quick Installation Guide Quick Installation Guide Version 1.3 September 2020 HELZEL Messtechnik GmbH Carl-Benz-Strasse 9 24568 Kaltenkirchen, Germany www.helzel.com e-mail: wera@helzel.com Tel.: +49 (0) 4191 - 95 20 0 Fax: + 49 (0) 4191 - 95 20 40 Document WERA4-Quick-US-200918 Page 1 of 73 Quick Installation Guide Intended Use and Safety Instructions 1.1 The WERA system is a short wave radar device for oceanographic applications. To run the system the user has to get an official permission from the local authorities to operate radio wave transmitting systems. This system complies with part 15 of the FCC rules. Operation is subject to the condition that this system does not cause harmful interference. The WERA system is designed for radar measurements at the ocean coast line. The transmitter antennae array will transmit a continuous RF signal with a power less than 10 Watts per antenna. Even if this low power wont generate any harmful voltage or radiation, it is required to take care that the installation of the transmit antenna system complies with the FCC requirements. Depending on the radar operation frequency, the antenna gain and the cable loss between power amplifier and Tx antenna system the minimum distance D can be calculated:
P D =
4 PD P = Pout + Gant - Attcable where D: minimum distance in cm between human and antenna P:
radiated power in mW, Pout : Output power of Power amplifier in dBm Gant : Antenna gain of transmit antenna system in dB Attcable : Cable attenuation in dB for cable from power amplifier output to transmit antenna Power Density in mW/cm2 PD:
PD = 900 / f 2 Radar operating frequency in MHz f:
The formulary to calculate the value of the power density is given in the FCC document Radiofrequency radiation exposure limit 47CFR 1.1310 Caution: It is required to apply adequate precautions, e.g. fences with warnings signs, to prevent that humans enter the area around the transmit antenna system which is closer than the minimum distance as calculated above. Document WERA4-Quick-US-200918 Page 2 of 73 Quick Installation Guide The system must be installed by skilled personnel using calibrated HF test instruments. The radiated HF power must be kept below the defined maximum radiation power for Ocean Radar of 50 WERIP (47 dBm). Please note that the WERA power amplifier is capable to provide up to 49 dBm to compensate for cable losses for cases with the Tx antenna system installed in a distance of several 100 Meters. PA output level = max radiation antenna gain + cable loss If the radiation cant be measured in the field, the antenna gain should be assumed as best case which is 6 dB. The output power can be set in steps of 3 dB and must always be adjusted to be below the permitted radiation level. The WERA system may only be operated in rooms with an electrical installation complying with the regulations for the use of outdoor equipment. The WERA system is only to be maintained or repaired by appropriately qualified personnel. Any modification of the system which is not explicitly defined in the user manual will void the authorisation to operate the system. This equipment has been tested and found to comply with the limits as defined for a Class A device in part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. Caution: Never use the WERA system without training or reading these instructions. 2. Introduction For information about the radar principle and the technical specifications, please refer to the WERA user manual chapter 2. 3. Site Survey For information about site survey, please refer to the Manual chapter 3 or the template WERA site planning form and instructions. Please note this document is an extract of the complete user manual. The chapter and figure numbers are used from this manual, for this reason some chapter and figure numbers are missing is this quick guide. The WERA manual and other related documents can be found on the WERA PC at:
/home/wera/Documents/
Document WERA4-Quick-US-200918 Page 3 of 73 Quick Installation Guide 4. WERA Hardware 0.0 User Interface PC 1.0 Frequency Control Rack 1.1 CLK 1.2 SRX 1.3 STX 1.4 SDU 1.5 STM 1.6 ADC 1.7 ADU 2.0 REceiver Rack 2.1 REC 1 to 12 3.0 Power Amplifier 3.1 Manual Gain Control Figure 1: Front view, WERA 12-Channel System Document WERA4-Quick-US-200918 Page 4 of 73 Quick Installation Guide 1.0 Frequency Control Rack 1.8 Main AC input & Switch 1.9 DIO72 1.10 RTU CPCI computer 1.11 Voltage Status Display 1.12 Ethernet Connection 1.13 Control I/O 1.14 Data I/O 1.15 Test, I/O (for test only) 1.16 RF-Driver (RFD) 1.17 Control Unit (CTU) 1.18 Control-Status (RSC-Logic) 1.19 Control Power (RSC-230V) 2.0 REceiver Rack 2.7 Status RER 2.1 RER power control 2.2 RER control input 2.3 Cal input 2.4 LoD input 2.5 Antenna input 1 .. 8 2.6 AC input 2.0 REceiver Rack 2.7 Status RER 2.1 RER power control 2.2 RER control input 2.3 Cal input 2.4 LoD input 2.5 Antenna input 1 .. 12 2.6 AC input Figure 2: Back view, WERA FCR Figure 3.1: Back view, WERA RER internal Filters (8 channels) Figure 3.2: Back view, WERA RER (12 channels) Version with internal Filters (RIN6) Document WERA4-Quick-US-200918 Page 5 of 73 Quick Installation Guide 2.0 REceiver Rack 2.7 Status RER 2.1 RER power control 2.2 RER control input 2.3 LO input 2.4 20 V output 2.5 Antenna input 1 .. 12 2.6 AC input Figure 3.3: Back view, WERA RER (12 channels) Version with external Filters (on AIP) 4.1 WERA-FCR FrequencyControlRack Figure 4: FCR Block Diagram The frequency control rack generates all required rf signals (clock and sweep) and provide the Tx and Lo signals. In addition to that it contains the state machine (process control unit
- STM) and the ADCs. The ADC output is clocked via a digital i/o-card into the memory of a CPCI module (RTU). It holds the following main modules:
CLK, STX, SRX, SDU, STM, ADC, RTU, CTU. For more information about these modules read the following pages. Document WERA4-Quick-US-200918 Page 6 of 73 4.2 Clock - CLK Quick Installation Guide Figure 5: Clock Module Master clock for the whole WERA system The standard module has got one clock and trigger output only. The third connector is for the SYNC antenna only (option). 4.3 Sweep-RX - SRX / 4.4 Sweep-TX - STX 1.1.0 SYNC antenna, for clock only. CLK 1.1.1 Clock signal out, to be connected to STM 1.1.2 Trigger signal out, to be connected to STM 1.2.1 LEDs
-> indicates signal generation Figure 6: Sweep Module Document WERA4-Quick-US-200918 Page 7 of 73 Quick Installation Guide The sweep modules generate the transmit (TX) and receive (RX) signals for the measurement. Normally their output is a linearly swept frequency sweep. In the newer WERA versions (since 2009) just the Rx sweep is active during acquisition. The Tx is used for calibration only and can be used as a spare part in case of a failure of the Rx sweep. The sweep dummy is an empty housing in an unused sweep module slot of the FCR. Its purpose is to keep the correct airflow and thus the proper cooling of the other modules
. 4.4 State-Machine - STM 1.5.1 Clock signal in 1.5.2 Trigger signal in 1.5.3 LED programming indicates successful Figure 7: State Machine Module The state machine synchronises data acquisition. After a restart of the system the illuminated LED indicates that the system is operational. To turn on the LED the RTU needs to mount directories on the user pc. Document WERA4-Quick-US-200918 Page 8 of 73 Quick Installation Guide 4.5 A/D converter - ADC 1.6.4 Analog signal in, N+3 1.6.3 Analog signal in, N+2 1.6.2 Analog signal in, N+1 1.6.1 Analog signal in, N 1.6.5 LED indicates sampling Figure 8: ADC Module Each ADC module samples I and Q information of four receive channels. Document WERA4-Quick-US-200918 Page 9 of 73 Quick Installation Guide 4.6 WERA-RTU - WERA Real-Time-Unit On newer versions:
DVI instead of VGA For visual troubleshooting information connect monitor here. Ethernet connection To user interface pc Figure 9: RTU Module The real time unit controls data acquisition and stores measurement data on the user interface pc. It communicates with the user interface pc and forwards all needed parameters to the control unit. 4.7 WERA-CTU - WERA Control-Unit The WERA control unit is programmed via an I2C Bus driven from the DIO 72. This unit programs the sweep modules with the parameters received from the real time unit and controls the receive and transmit signals. There are no front panel connections for this unit. Document WERA4-Quick-US-200918 Page 10 of 73 Quick Installation Guide 4.8 WERA-RSC - WERA Remote & Status Control 1.11 Control-Status (RSC-Logic) Connection to Power Amp. Connection to RER Connection to user PC Optional connection to 2nd RER 1.12 Control Power (RSC-230V) Control Power (RSC-230V) Figure 10: Remote & Status Control Modules (RSC 230 & RSC Logic) The RSC Logic module is connected to the WERA Interface PC via the LPT port. Through this connection system settings are programmed and system status can be monitored. The RSC 230 module is used to remotely switch on and off individual parts of the WERA system, e.g. to save power at sites that produce their own energy. 4.9 WERA-RFD - WERA RF-Driver Connection to Cal-Splitter on Lightning Protection Plate Connection to Power Amplifier (PA) Connection to Receiver Rack (RER) Figure 11: RF-Driver Module - RFD (figure shows version to drive one Receiver Rack) The RFD module provides the RF signals for acquisition and calibration modes. For 16 Channel operation (2xRER), secondary CAL and LO outputs can be mounted. Document WERA4-Quick-US-200918 Page 11 of 73 4.10.1 Quick Installation Guide WERA-RER - Receiver Rack (12 channels) external filter Figure 12: RER Block Diagram for 12 channels (external filter) The receiver rack holds the input filters and receiver modules of up to 12 channels. For this version the Receiver Input Filters (RIN filters, chapter 4.11) and the Calibration Splitter Unit (Cal-Splitter, chapter 4.12) are mounted on the Antenna Interface Plate (AIP). 4.10.2 WERA-RER - Receiver Rack (12 channels) internal filter Figure 13: RER Block Diagram for 12 channels (external filter) Document WERA4-Quick-US-200918 Page 12 of 73 Quick Installation Guide 4.10.3 WERA-RER - Receiver Rack (8 channels)
+9 1dBm Figure 14: RER Block Diagram for 8 channels The receiver rack holds the input filters and receiver modules of up to 8 channels. For a system with 16 receive channel you always need two receiver racks, each containing 8 receiver. 4.11.1 Receive-Input-Filter - RIN (for 12 channels) external Filter Version 20V supply voltage cal signal for internal calibration antenna input Figure 15: RIN Module Each RIN module contains a band-pass input filter as well as the relays for the internal calibration. The filter is designed for a specific frequency and bandwidth to provide optimum noise reduction. In addition to that these modules contain two lightning protection stages. The first stage is a 350 V surge protector and the second stage consists of 4 switching diodes which get conducive in case of an overload at the filter output. The system will operate even with burned fuses but with reduced signal levels at these channels. If a different operating frequency is needed, the RIN modules have to be exchanged. Document WERA4-Quick-US-200918 Page 13 of 73 Quick Installation Guide 4.11.2 Receive-Input-Filter - RIN6 (for 12 channels) internal Filter Version Figure 16: RIN Module Each RIN module contains band-pass input filters for six receive channels as well as the relays for the internal calibration. The filter is designed for a specific frequency and bandwidth to provide optimum noise reduction. In addition to that these modules contain the last lightning protection fuses. These fuses consist of 4 switching diodes which get conducive in case of an overload at the filter output. The system will operate even with burned fuses but with reduced signal levels at these channels. If a different operating frequency is needed, the RIN modules have to be exchanged. In older WERA versions the lid of the RER unit need to be removed to get access to the SMA connectors. 4.11.3 Receive-Input-Filter - RIN (for 8 channels) Figure 17: RIN Module Each RIN module contains band-pass input filters for four receive channels as well as the relays for the internal calibration. The filter is designed for a specific frequency and bandwidth to provide optimum noise reduction. In addition to that these modules contain the last lightning protection fuses. These fuses consist of 4 switching diodes which get conducive in case of an overload at the filter output. The system will operate even with burned fuses but with reduced signal levels at these channels. If a different operating frequency is needed, the RIN modules have to be exchanged. In older WERA versions the lid of the RER unit need to be removed to get access to the SMA connectors. Document WERA4-Quick-US-200918 Page 14 of 73 Quick Installation Guide Supply for Active Rx Antennas Dual-Receive-Input-Filter - DRIN (for 8 channels) 4.11.4 Each RIN module contains band-pass input filters for four receive channels as well as the relays for the internal calibration and switching filters. Each of the two filters per channel is designed for a specific frequency and bandwidth to provide optimum noise reduction. From the outside, the DRIN is mechanically and optically identical to a normal RIN module and is also connected in the same way. If a DRIN Filter is used in a non-dual frequency environment (no Software updates, no modified PA) then it can be used as a normal RIN
(default Filter path is active). 4.11.5 All Receiver-Input Filters can supply the dc-voltage which is required to use active Rx antennas. This dc-supply needs to be activated by means of an internal jumper for each antenna. The RIN module needs to be un-plugged and opened to access these jumpers. 4.12 Calibration Splitter (for 12 channel versions only, refer to 4.11.1) Distribution of cal signal to RIN distribution of supply voltage to RIN 20V supply voltage From RER cal signal for internal calibration from RFD Figure 18: Cal-Splitter Module This module distributes the 20 V supply voltage and the calibration signals to the 12 Receiver-Input-Filters modules (RIN) Document WERA4-Quick-US-200918 Page 15 of 73 Quick Installation Guide 4.13 Receiver - REC 2.1.1 trimmer for i/q phase
-> fine-adjustment 2.1.2 Analog signal out to ADC Figure 19: Receiver Module The receiver modules receive the antenna signal over the receiver input filters, mix it down in frequency and amplify it for the ADC modules. Note:
The thinner 12 Channel REC have a pre-mounted ADC-cable instead of a detachable one. Document WERA4-Quick-US-200918 Page 16 of 73 Quick Installation Guide 4.14 WERA-PA - Power Amplifier (Rack Version) The standard version of the power amplifier is housed in 19 rack, 3 HU, see figure 21. This version can provide up to 80 Watts output power to compensate cable loss. The antennas should be connected via an external 1:4 power splitter with two pairs of phase cables, the longer cables are always used to connect those antennas which are located closer to the water front. Figure 20: Power Amplifier Rack Version Block Diagram Figure 21: Power Amplifier Rack Version Document WERA4-Quick-US-200918 Page 17 of 73 Quick Installation Guide 4.1 PA-Rack rear 4.3 Transmit signal TX in 4.4 Voltage selector For new versions this function is disabled 4.5 AC in 4.6 Transmit signal out as the signal will be splitted at the power splitter at the TX area 4.7 Dual Frequency Feature
(4 identical signals) newer WERA versions will only have 1 transmit signal out Not shown in picture or functional diagram:
- A dual frequency PA provides one TX input and two separate TX-Outputs (one for each frequency). Internally they are connected to two separate low pass filters.
- Via an additional Dsub connector the switch frequency signal is carried from the FCR (Control I/O -
> aux connector) to the PA. Figure 22: Power Amplifier Rack Version rear view with 4 outputs 4.15 WERA-IPC - User-Interface-PC The User Interface PC is used to control the WERA system. Measured data are stored on
(removable) hard disks and can also be send to a central processing station over a data link. There are tools to process and visualize the data. Figure 23: Typical User Interface PC (in this case with 3 height units, newer ones with 2 HU) Document WERA4-Quick-US-200918 Page 18 of 73 Quick Installation Guide 4.16 Block Diagrams and Table of Interconnecting Cable Cable Id Quant. Connect to Connect to Description 1.21 Line 2.7 UPS 2.6 1.20 1.17 1.25 RF UPS 1.23 2.3 2.4 1.1.1 1.1.2 4.3 Line 1511 310 1511 1653 1653 1938 1965 2173 2528 2528 2870 9100 3325 9007 9139 9155 9008 9008 9014 9025 9034 9058 9073 9117 9118 9137 1 (2) 1 (2) 1 (2) 4 to 12 1 (2) 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Table 1: Cable Connections 4 to 12 2.1.2 3.2 UPS 3.7/8 3.4 3.4 2.2 PA Control (15 poles male-female) AC Power of the whole WERA System Status control RER AC power cable 1 m for FCR AC power cable 1 m for RER RER Control (9 poles male-female) keyboard Y-cable for keyboard and mouse Interface PC Ethernet, cross-over AC input PC 3.4 UPS AC power cable 1,8 m, FCR, PA, Monitor AC power cable 1.8 m, monitor & PC SYNC SYNC-Ant PS2/RS232 special cable RIN RF cables to lightning protection, 3 m Interface PC RS232 special cable Local oscillator signal to RER With one RER only, 50 Ohms at 1.23 Internal Cal. signal to Cal-Splitter 20 V to Cal-Splitter Clock signal Trigger signal 2.4 4.12 4.12 1.5.1 1.5.2 4.6.8 4.4 PA RF in to board (in-side PA) AC Power PA (out-door version only) 1.6.1 to 1.6.4 Analog data signal, REC to ADC 1 pig-tail cable at each receiver Scope Test cable Receiver to Oscilloscope 1.19 3.9 Digital i/o port (DIO) LPT cable, 1.8 m 2.1.2 1.16 PC-LPT Test - Out Cal-Box Option: for dynamic test purpose only Test In Test Out Normal connection for operation Tx-out PA Input H155 coax, 1.5 m Document WERA4-Quick-US-200918 Page 19 of 73 Quick Installation Guide Figure 24: Block Diagram WERA IV 12 Channel with AIP (external Filters) Part 1 of 2 Document WERA4-Quick-US-200918 Page 20 of 73 Quick Installation Guide Figure 25: Block Diagram WERA IV 12 Channel with AIP (external Filters) Part 2 of 2 Document WERA4-Quick-US-200918 Page 21 of 73 Quick Installation Guide Figure 26: Block Diagram WERA IV 8 or 12 Channel with RIN or RIN6 (internal Filters) Part 1 of 2 Document WERA4-Quick-US-200918 Page 22 of 73 Quick Installation Guide Figure 27: Block Diagram WERA IV 8 or12 Channel with RIN or RIN6 (internal Filters) Part 2 of 2 Document WERA4-Quick-US-200918 Page 23 of 73 Note:
Quick Installation Guide All the delivered cables have identification numbers. Plug in all the cable (given in table 1) fig. 9 and refer to fig. 1 to 8 Take care for the correct order of connection of cable 9026 for REC and ADC. The REC`s are numbered from left to right, the ADC inputs are numbered from bottom to top and left to right, for example:
1.6.4 Channel 4 1.6.4 Channel 8 1.6.1 Channel 5 1.6.1 Channel 1 2.1.2 Channel 8 2.1.2 Channel 1 Figure 28: FCR and RER, front view, numbers of RECs and ADCs Document WERA4-Quick-US-200918 Page 24 of 73 Quick Installation Guide Take care for the correct connection of cable 9028 for DIO72 and control port. The DIO72, #1 is the left one. The two flat cables are marked with A and B. A crossed LAN cable 2173 is needed to connect the RTU with the external PC. Its optional to plug the Y-cable 1965 in the PS2 socket of the RTU to connect keyboard and mouse. Newer ones support USB mouse/keyboard. A standard extension flex cable is used to connect the control ports in between the racks. If the system is used with only one RER, terminate the second LoD out with 50 Ohms / 0,5 W Main Power connection 1.16.1 DIO72, #1, A & B 1.17.1 CPCI, keyb. ,mouse 1.17.2 CPCI, LAN 1 (Ethernet) Input from RER Control 1.19.2 DIO72, #1, B 1.19.1 DIO72, #1, A 1.20.1 Test in & out Status & Remote Control Ports System Power Supply Optional: Dual Frequency Control <-> PA Figure 29: FCR back view, connection of digital data links Please note: Never cover any air slots. Since there are slots in the bottom lid of the FCR and the RER also, do not operate parts of the system on a desktop without putting some "foots" underneath the lowest rack. For this reason please use only the recommended order for setting up the rack:
o PC o FCR o RER o PAR WERA Interface PC Frequency Control Rack Receiver Rack Power Amplifier Rack Document WERA4-Quick-US-200918 Page 25 of 73 Quick Installation Guide 1.0 WERA Interface PC 2.0 FCR 3.0 RER 4.0 Blind plate for ventilation 5.0 Power Amplifier
(depends on rack) 5.0 Room for UPS Figure 30: WERA front view Please note: Exact rack mounting order is required for optimal cooling Document WERA4-Quick-US-200918 Page 26 of 73 Quick Installation Guide 4.17 Uninterrupted Power Supply (UPS) It is strongly recommended to operate the WERA from an UPS unit. At least the WERA User Interface PC should be connected to such a unit to guarantee a controlled and safe ramping down of the PC in case of a power failure. The hard- and software of the ups needs to be configured to safely shut down the PC in case of a longer power loss. So a data link and software between the PC and ups is required. In case of a very insecure power line, it might be better to operate the WERA system from a UPS that continuously is generating the AC. Please contact factory to get more information about these options. 4.18 Lightning Protection (-Plate) for WERA 8- channels All WERA installations needs to be equipped with professional lightning protection units. If the WERA electronics not housed in the original WERA container it is very important to feed-in all cables via lightning protection filters. These filters are provided by Helzel, 8 surge protectors mounted on one plate. This plate needs to be connected to Earth potential by means of a suited cable (a 10 mm2 cable is enclosed). Please carefully check these connections and if there are any doubts, please contact Helzel factory or a local service company for help. For the WERA 12-channel systems with AIP, the lightning protection is integrated in the RIN filters. Some models have a separate lightning protection plate, depending on the system configuration. Document WERA4-Quick-US-200918 Page 27 of 73 5. Pos Quick Installation Guide Installation and Tune Up Information This table shows all installation steps in an order as they should be carried out. On the following pages some more details can be found. Task Required Tools, Material, Personnel 01 Mark position for both containers Tape measure (5 m) 02 Build simple fundament for containers 03 Download containers and place it on the fundament Forklift to handle 3000 kg 04 Mark all receive and 4 transmit antenna positions Brig stones or equivalent to keep the container 30 cm above ground poles for bearing, sticks to mark positions, hammer, tape measure 3 men 05 Define route of cable channel if required more sticks to mark channel 06 Install antenna poles with guide ropes 2 to 3 men 07 Install antenna coil with radials and check tuning 08 Cable laying (if required in tubes or foil) 09 Connect line power and phone connection 10 Unpack system components and install rack 11 Power up system and configure WERA Control 1 man 3 men 2 men 1 men 12 Run internal calibration (256 samples, 80 Hz offset) 1 men 13 Connect Calibration Box outdoors at end of Rx cables 1 men and run calibration. Activate calibration. 14 Connect all Rx antennas 1 man 15 Connect Tx array and feed-in just one signal from Tx 2 men output (no power amplifier connected yet) Run calibration and check direct path signals 16 Connect Power Amplifier, switch all attenuators on and start test calibration. Adjust PA power to green 1 men 17 Stop test calibration and run calibration to check direct 1 men path signal. Reduce power if required. 18 Fill out check list 19 Seal all outdoors coaxial connectors 20 Run single acquisition to check SORT spectra 21 Edit params.config to match with site geometry and 1 man WERA Control parameters 22 Run Plott_WERA_Sort_RCs_Beam 23 Check .crad and .wrad outputs 1 men 1 man 1 man 1 man 1 man 1 man 24 Configure script files and set system to cont. Acq. The required time for the installation of one site is about one week with a man-power of 3 or 4 people. Document WERA4-Quick-US-200918 Page 28 of 73 Quick Installation Guide 5.1 Position of Container If possible find a place for the container in-line or behind the antenna arrays. It is possible to use the roof of the container to place the TX array. In this case the container should be placed in line or in front of the Rx array. The container needs to be placed at least 20 cm above ground due to the opening for the cables is in the floor. The fundament can be made with brig stones or wooden beams. 5.2 Transportation and Handling of Container The container can be lifted with a forklift or a crane that can handle 3000 kg of load. For transportation all electronic units need to be packed carefully and the empty 19 rack should be stabilised. All boxes inside the container need to be protected to prevent movements. Forklift for normal road Off road option Please note, if the computer is placed inside the container for transportation it is strongly recommended to install an extra protection for the CPU heat sink. 5.3 Antenna Positions Rx Antennas The Rx antenna array should be installed about parallel (+/-15) to the shore line or the edge of a cliff. The center of the Tx array should be located in line with the Rx array or in-
front of the Rx array. If the Rx array may be installed on a cliff, the Tx can be installed down hills, directly in front. It is possible to place the array as a curved array or even as random spaced antenna array. In all cases the distance between the Rx antenna poles should be about:
Rx pole to pole distance = 0.45 Lambda. In case of the standard linear configuration the accuracy of this distance should be 10cm. In any other case the individual antenna positions need to be measured by means of a differential GPS that can provide the 10cm accuracy. The variation in height is less critical for the Rx array. A slope of half the pole length can be accepted. Document WERA4-Quick-US-200918 Page 29 of 73 Tx Antennas Quick Installation Guide The optimum position of the Tx antenna array is in a distance of 5 to 10 Lambda from the Rx array orientated in-line with the Rx array. But there are other options as well, see below:
Optimum with Rx and Tx in-line Curved array to provide more angular field of view Arbitrary spaced, attention: all inter antenna distances must be smaller than Lambda The Tx can be located on the roof of a container, the Tx pattern need to be carefully checked before The compact configuration can be used if a 30 %
reduction of the radar range is acceptable The Tx-SAT option allows to place the Tx array in a distance of some km from the Rx array Please note, in any case the Tx the height of the 4 antenna poles should be almost equal with a tolerance of about 20 cm. Document WERA4-Quick-US-200918 Page 30 of 73 Quick Installation Guide The Tx array geometry defines the Tx beam pattern. The rectangular configuration with 0.5 Lambda along the water front and 0.15 Lambda perpendicular provides a theoretical null towards the Rx array and a quite narrow beam towards the bore sight of the radar. At the outer edges ( 60) the Tx signal is already attenuated by more than 10 dB. For this reason the optimum Tx geometry is 0.35 to 0.45 Lambda x 0.15 Lambda. This provides a wider beam width -6 dB at the edges and a soft minimum towards the Rx array. Tx array exact in-line with Rx array 5.5 Cable Protection The Rx cables need to be protected against direct sunlight because this will lead to inhomogeneous heating resulting in different phase shifts. This can reduce the angular accuracy of the beam forming process. If for a non permanent installation the cables are buried in the ground it should be taken into account that removing the cables can cause strong mechanical stress that may damage the cables. Please note, that the preferred low loss cables are sensitive to mechanical stress and do not allow narrow bending. Use a flexible tube to protect cables or dig a cable channel Document WERA4-Quick-US-200918 Page 31 of 73 Quick Installation Guide The kind of connection of the Tx array depends on the distance between the Tx array position and the container. If this distance is very long, the RF power loss on the coax cable can be quite high. The cable loss depends on the distance, frequency and cable type. Please refer to the WERA Tables to check if for your installation this cable loss can be accepted. To achieve the full performance of the system, at least 20 Watts (43 dBm) of RF power should reach the center of the Tx array. The outdoor version of the PA can generate up to 50 Watts (47 dBm), the standard indoor, rack mount version can generate up to 80 Watts
(49 dBm). If the required cable length results in a much smaller value, the power amplifier should be placed outdoors next to the Tx array. In this case a line power connection to this position is required. Please check the kind of protection that is required for save operation in this environment. 5.6 Install Antennas The antenna poles need to be installed isolated from the ground. The recommend construction is to use a metallic ground anchor, attach a wooden beam to that (at least 1.5m) and mount the antenna pole to that wooden beam. To stabilise that construction guide ropes (no metal) should be used. For antennas not higher than 4 m overall one set of guide ropes may be sufficient. For higher antennas we recommend to use two sets of guide ropes. Typical antenna construction for antenna poles of up to 4 m length. Antenna without radials and guy ropes and with a mirror pole. Document WERA4-Quick-US-200918 Page 32 of 73 Quick Installation Guide The typical antenna construction is sketched on the left, the right schematic shows an antenna geometry, suited for the installation on a mole. The mirror pole would suppress the signal from the other side of the array. A lot of other antenna construction versions are available, please contact the Wera team. Wooden beam mounted to metal anchor Antenna coil mounted above metal anchor The guide ropes should be fixed with ground nails or tent pegs, - their positions depend on the length of the used radials. The distance between the antenna pole and the tent pegs should be about 30 to 50 cm longer than the radials. The orientation of the radials and the guy ropes is sketched below. Typical Rx antenna radial orientation Typical Tx antenna radial orientation Document WERA4-Quick-US-200918 Page 33 of 73 Quick Installation Guide 5.7 Antenna Tuning 5.6.1 Rx-Antenna Tuning The antenna tuning coils should be installed with contact grease and secured by means of the hose clamps. Please attach just loose for the first step, since the depth of shifting in the tuning coil into the pole will be used for fine tuning later on. Ensure that the ends of antenna poles (tubes) are clean inside and free of an oxide layer. If required clean with a metal brush. The radials should be connected with a little bit of contact grease as well. Attach the radials without mechanical stress to the guide ropes (using a cable clamp or tape) and wind it around the guide rope (5 to 10 turns). Attach the end of the radial to the peg by means of a guide rope. Use at least 50 cm guide rope to keep the end of the radial isolated from the ground. Attaching radial to guide rope Radials twisted around guide rope Now check the antenna tuning (resonant frequency) and matching (VSWR). We recommend using a battery driven antenna meter. Antenna meter with broad resonance Sharp resonance peak Document WERA4-Quick-US-200918 Page 34 of 73 Quick Installation Guide The antennas should be tuned to the intended working frequency and it needs to be matched to 50 , low VSWR over a wide bandwidth > 500 kHz. Please note, always use a cable of at least wave length to connect the antenna meter. Layout this test cable almost identical to the proposed layout for the final connection, otherwise the readings will be incorrect. As test cable the longer one of the phase cables for the Tx array can be used. Nobody should be standing next to the antenna and metal material (ladder, tool box) should be removed from the antenna. If the antennas bandwidth is wide like it is shown in the graph on the left picture, then tune the antennas center frequency to working frequency. If the antennas bandwidth is more narrow like on the right picture, then tune the antenna a little bit to the left or to the right of the working frequency. Choose that side, where the graph has a smooth shoulder and use this side for all antennas. Please note, metal fences, power cables or other electrically conductive material should be avoided within 1 electromagnetic wavelengths distance around the antennas. Particularly the Tx array is sensitive to metal constructions close to it. The resonance can be tuned by changing the length of the antenna pole. A variation of about 20 cm can be achieved by changing the antenna tuning coil connection to the pole. If this fine tuning (+/-150 kHz) is not sufficient, there are additional options for tuning:
If the antenna tuning coils are new, they may not be sealed. In this case the frequency can be shifted lower by pressing the winding of the coil closer to each other and vice versa.
- The mounting height above ground level will influence the position of the resonance frequency. A higher elevation will typically increase the frequency.
- The radial length will have a strong effect on the frequency. Shorter radials will increase the resonance frequency.
- The layout of the radials will have an influence as well. Keeping the radials higher above ground will increase the frequency and laying it on the ground or even connecting the end to the ground will decrease the resonance. Regarding the matching (VSWR) the last three modifications will strongly chance this parameter as well. The VSWR is more critical for the Tx array. It should be better than 1:2 at center frequency with a tolerance of +/- 0.3 for all antennas. For the Rx array the VSWR should be better than 1:2.5 at center frequency with a variation of +/- 0.4 for the whole array. Please note, that the VSWR values given above, are the values at the center frequency, not at the resonance. The values at the resonance are typically much lower. It is recommended to note the antenna parameters of each antenna in the log book:
- Resonance, VSWR at resonance, Band width for VSWR 1:2, VSWR at center frequency 5.6.2 Tx-Antenna Tuning Document WERA4-Quick-US-200918 Page 35 of 73 Quick Installation Guide The Tx antenna tuning is slightly different from the Rx tuning because due to the fact that 4 antennas are located very close to each other, these antennas will affect each other. For this reason it is recommended to install just one Tx antenna first and tune it without having another Tx antenna mounted. This Tx antenna should be tunes very similar to the Rx antennas. Now leave the Tx array with just this one Tx antenna mounted and tuned. 5.8 Cable laying The cables are sensitive to mechanical stress like strong pulling or bending with a small radius. The connectors should be protected against any kind of pollution. There are plastic caps in the antenna package that can be placed on the connectors. If it is raining or very windy with flying sand, we recommend to seal the gap between cap and cable with tape. Dont forget to mark each end of the cable with a label. It is recommended to put the cable spool on an axis. Then two people should carry that spool along the cable path spooling down the cable. If the cable needs to be fed through a pipe or a closed cable channel, the spool should be placed on that axis at one end. The cable can be pulled through the pipe slowly if the following conditions are taken into account:
- no pulling for more than 50 m
- no pulling around a corner
- attach the rope for pulling at several positions and prevent any stress on the connector 5.9 Connect line power and phone connection Connect the line power according to the instructions that are written on the transformer and the red mains connector. The system can operate from 115 or 230 Volts and the transformer can be configured for both input voltages. Furthermore the transformer can be used to compensate a small voltage drop of the input line. After this the phone line, micro wave link or any other data line can be installed. 5.10 Install WERA rack Unpack the system carefully, keeping the boxes undamaged. These may be used again if the installation should be moved in the future. Please ensure that the WERA racks are mounted in the right order. Connect all cables at the front and rear of the system. 5.11 Power up system Please ensure that the UPS is installed correctly there is a protection plug for transportation. If it is planned to move the system in the future, place a note on the UPS to unplug this protection for transportation. Document WERA4-Quick-US-200918 Page 36 of 73 Quick Installation Guide The user interface PC will be delivered with an additional transportation protection inside. This protection needs to be removed before switching on. Keep this protection material for future transportation. If the system is connected correctly, the user interface PC is directly connected to the UPS and can be started without switching on the WERA system. Turn on the PC and wait until Linux has booted. Please check if there is access to WERA Desk. Turn on the WERA system with the main switch at the front of the lower rack. The green LED of the Clock Generator (top left) should be on immediately. After about 30 seconds the green LED of the State Machine (STM) should turn on. This indicates that the internal PC has booted. If this LED does not illuminate, please check the connections at the front and rear. The internal PC cant boot before the user interface PC has booted. If the user interface PC needs to be restarted the systems CL7 needs to be restarted as well or measurement data may not be saved. 5.12 Calibrations 5.11.1. Full Calibration Please do not use this calibration, it takes 3 hours to run and was already carried out at the factory. It may be required in case of a major system fault and the replacement of the receivers only. 5.11.2. Internal Calibration Even if this internal calibration was carried out at the factory as well, it should be checked to verify if everything is ok after transport. Start an Internal Calibration under the WERA Control Center. Use settings for a short run:
256 samples, 0.260 sec sweep time, 80 Hz offset Check the results using Plott_WERA_Cal_lsq according to the description in pos. 11.7. In the resulting table all RMS-Voltage should be almost identical and the Cal values should be between 1.0 and 1.1. In the second part of the table are the phase values listed. At the Peak the phase should be between +6 to -6 degrees. Finally the I/Q-Balance should be between 84 and 96 degrees. If the results are ok, the name of this calibration file and its results should be changed to calibration.wera_internal and should be noted in the log book. It may be helpful for future trouble shooting. Document WERA4-Quick-US-200918 Page 37 of 73 Quick Installation Guide 5.11.3 Cable Calibration This calibration is essential for the operation of the WERA system. Normally this calibration was already carried out at the factory. In that case the calibration is already activated and should not be run again!
If the cable calibration needs to be carried out in the field, there are several options. 5.11.3.1 Calibration with Calibration Box (1:16 Splitter) All cable ends should be labelled with the correct receiver channel number. In any case the Receiver Input of all channels needs to be connected to the lightning arrestor plate or for WERA IV to the Receiver Input filters. All Rx coax cables need to be connected to the input of the lightning arrestor plate. The cables can be calibrated before they are rolled out. In that case all Rx cables spools need to be placed next to the lightning arrestor plate to be connected. All other ends of the Rx cables should be connected to the Calibration Box. One extra coaxial cable need to be connected from the Tx driver output (chapter 4 page 2). (Attention, never use the output from the Power Amplifier for the calibration). This cable need to be connected to the center connection of the Calibration Box. Start a Calibration under the WERA Control Center. Use settings for a short run:
256 samples, 0.260 sec sweep time, 80 Hz offset Check the results using Plott_WERA_Cal_lsq according to the description in pos. 11.7. In the resulting table all RMS-Voltage should be almost identical and the Cal values should be between 1.0 and 1.1. If this is not the case the according cable or connector has a problem. In the second part of the table are the phase values listed. At the Peak the phase should be between +30 to -30 degrees. If this is not the case one of the cables has a different length (outside of normal tolerance). Phase differences of up to 180 can be compensated by the WERA software. Nevertheless such a cable is suspicious and should be double checked. If the results are ok, the calibration file (.amphase) should be copied into the directory
/home/wera/etc/ and renamed to calibration.wera. Additionally this should be noted in the log book. Now this calibration is activated and will be used for all measurements. Note that some programs may need to be restarted to use the modified calibration constants. This calibration procedure can also be carried out with the cables already laid out. In that case the cable ends need to be collected in the field and connected to the Calibration Box. The input of the Calibration Box needs to be connected with a long cable to the TX-
Out output of the Frequency Control Rack (FCR). Normally no power amplifier should be used for this type of calibration to avoid damaging the 1:16 calibration splitter box or the receiver input filters. 5.11.3.2 Calibration with special Spectrum analyser Document WERA4-Quick-US-200918 Page 38 of 73 Quick Installation Guide Some portable spectrum analyzers like the Rohde & Schwarz FSH3 with build-in tracking generator got the option to measure phases relative to a calibrated reference cable after performing an open/short/load calibration at the end of the reference cable. There is a separate document describing in detail how to perform such a calibration measurement with this analyzer model. See the document WERA-Cable-calibration_using FSH3-150907.pdf for details. Other analyzers might be used in a similar way. The resulting phase values are not as stable as when using the 1:16 calibration splitter box. Additionally it must be kept in mind that the displayed phase values are results from a reflection measurement and thus the values need to be divided by 2 to retrieve the correct values for the calibration table. 5.11.3.3 Calibration with precise TDR If all receive cables are from the same manufacturing batch and thus got exactly the same velocity factor, then an alternative method is to use a very precise Time-Domain-
Analyser TDR and measure the differences in cable length. With these values known, and the correct velocity factor for the cables, the according phase difference to cable 1 can be calculated. That means a cable that is longer than cable #1 will have a positive phase value. These calculated phase values need to be subtracted from the phases values of the internal calibration. For this the file calibration.wera_internal need to be edited and the modified file should be stored as calibration.wera in the .etc folder. But beware ! - If it is not known, if all cables are from the same batch, the velocity factors may be different and then the calculated phase differences would be wrong. So the other mentioned calibration methods are preferred. 5.13 Connect all RX antennas Now all Rx antennas can be connected, but do not seal them now. The coax cables should be placed in their final position. 5.14 Connect Tx array Now connect the one already tuned Tx antenna direct to the Tx cable (a female-female N connector is required). The Tx cable can be connected to power amplifier (PA) output, but ensure to switch the PA to lowest gain (turn knob to left most position or use PA setup section of WERA Remote control software if remote controlled PA). Start a Calibration under the WERA Control Center. Use settings for a short run:
256 samples, 0.260 sec sweep time, 80 Hz offset Check the results using Plott_WERA_Cal_lsq according to the description in pos. 11.7. In the resulting table no RMS-Voltage should be higher than 7 Volts. No voltage should be
>7 Volts but it should be >1 Volt. Document WERA4-Quick-US-200918 Page 39 of 73 Quick Installation Guide If one voltage is higher, check if the PA is really operating with lowest gain. If the power need to be further reduced, connect a 20 dB N-attenuator (enclosed in the tool box) at the input of the PA and run the test again. Now the voltage must be smaller than 7 volts but maybe now it is lower than 1 volts. In that case you may need to increase the gain of the PA (1 step of the knob to the right is +3 dB). The voltage level for the Rx antenna that is closest to the Tx should have the highest signal. The level should decrease with increasing distance to Tx. If there is a strong jump in the signals level behavior, something with the Rx array is not normal (cable, VSWR, resonance, strong reflections, dunes). If the reason might be environmental conditions, this effect can be accepted. Mismatching or wrong tuning needs to be corrected. If the voltage is correct, keep this setting and write down the rms voltage of that antenna closed to the Tx array in the Installation Check List. Now Start a Single Acquisition, dont forget to set the frequency offset to 0Hz 512 samples, 0.260 sec sweep, no frequency offset Check the results using Plott_WERA_Sort_RCs_Beam_rfi according to the description in pos. 11.5. From the Range Doppler plot the range can be estimated. Please write down this estimated range at 0 in the Installation Check List. After these first tests with a single Tx antenna (with an omni-directional beam pattern) the remaining Tx antennas need to be installed and tuned, see chapter 5.6 Important: Because the 4 Tx antennas are located quite close to each other, the individual characteristic is affected by their neighbors. For that reason please carefully follow these instructions:
Mount all antennas and connect all cables. Layout all cables in their final position. The cables should not be moved again. The cable layout should be similar to the sketch below. Radials Long Phase cable Ocean this direction Antennas short Phase cable short Phase cable 1:4 Splitter Long Phase cable Tx cable The cables should be laid out as sketched. The coax cables should run in parallel with the radials and the left over coax cable should be placed as coil next to the 1:4 splitter which is placed behind the array. The splitter can be buried in the ground. Document WERA4-Quick-US-200918 Page 40 of 73 Quick Installation Guide When all cables are in their final position and connected to the Splitter the final tuning starts:
1. Connect the already tuned antenna to the antenna meter and check the tuning. Most likely it has changed and a re-tuning is required. 2. Reconnect the first antenna to the Splitter to ensure a correct load and proceed to the next antenna for tuning. 3. Reconnect the second antenna to the Splitter and proceed with the next antenna. 4. Reconnect the third antenna to the Splitter and proceed with the last antenna. 5. Now reconnect the last antenna to the Splitter and check the first one again. Most likely it has changed and a re-tuning is required. 6. Repeat the entire cycle until the result is ok. The VSWR of the Tx antennas is critical and should be almost identical for all 4 Tx antennas. The resonance dip (if it is sharp) should be outside the sweep bandwidth. The VSWR value should be lower than 1:1.6 (in worst case 1:2). Finally when all 4 Tx are well tuned and connected to the 1:4 Splitter the performance should be checked:
Use the identical WERA settings as before at the beginning of this chapter. Start a Calibration under the WERA Control Center. Use settings for a short run:
256 samples, 0.260 sec sweep time, 80 Hz offset Check the results using Plott_WERA_Cal_lsq according to the description in pos. 11.7. Write down the rms voltage of the antenna closest to the Tx array in the Installation Check List in the line below the value measured with one Tx antenna only. This new value must be lower than the value measured before. The ratio between the first measured voltage and this new one should be better than 3 the best case is about 10. If not the Tx array is radiating in a wrong direction or rf power is directed through a metal fence towards the Rx array or it is reflected from a metal construction nearby. Now Start a Single Acquisition, dont forget to set the frequency offset to 0Hz 512 samples, 0.260 sec sweep, no frequency offset Check the results using Plott_WERA_Sort_RCs_Beam_rfi according to the description in pos. 11.5. From the Range Doppler plot the range can be estimated. Please write down this estimated range at 0 in the Installation Check List below the before measured value. The range should be longer now. If not the Tx array is radiating backwards or the environmental conditions have strongly changed since the first acquisition. Now the Tx array should be ok. Document WERA4-Quick-US-200918 Page 41 of 73 Quick Installation Guide 5.15 Adjust Power Amplifier (PA) level (Tune Up Info Part I) There are two power amplifier versions available. The outdoor version in a water proof box and a rack mount version. The rack mount version is easy to handle because all displays and knobs are at the front panel. To access the knobs, the transparent lid can be removed
(this is to prevent any accidentally adjustments). The adjustment is easy, turn the knob to the left most position to start with lowest power (continue with chapter 5.14). The outdoor version needs to be opened to access the adjustment switches.
- Open the PA box carefully and leave it open.
- Check that the line power voltage switch is in the correct position
- Switch all four attenuators inside the PA to on-position (minimum output power).
- Connect all four Tx antenna cables to the PAs outputs. The order does not matter but it is recommended to use an order that should be marked on the antennas and may be noted in the log book. If an outdoor 1 to 4 power splitter is used, the internal splitter of the PA needs to be bridged. A coax cable is enclosed to provide a direct connection from the SMA connector to the N-output connector, please refer to chapter 4.14.
- Leave the input of the PA open, do not connect the input cable to the PA.
- Connect the line power. The green LED should be on.
- Start a test calibration.
- Now connect the PAs input with the Tx cable from the system output and check the status of the LED power meter. If the power level is above the green level, the attenuator switches might be in the wrong position or the PA is connected with a very short cable. In that case, connect the 20 dB attenuator at the PA input.
- Normally one of the yellow LEDs of the PAs power meter should be on. In this case carefully increase the power level by means of the attenuator switches until the green LED is on. If the PA gets into failure mode (red LED on), please make sure that the reason for this failure is eliminated and than push the reset knob. In error mode the PA will continue operation but with reduced gain (- 4 dB).
- Stop test calibration.
5.16 Direct path check and optimise power (Tune Up Info Part II) Run a short calibration measurement (80 Hz frequency offset) with the PA connected and set to minimal gain. Check the results using Plott_WERA_Cal_lsq according to the description in pos. 11.7.
- Normally no rms voltage should be above 7 Volts
If some voltages are higher check if the PA is really set to minimum gain
- Connect a 20 dB N-Attenuator at the input of the PA. Document WERA4-Quick-US-200918 Page 42 of 73 Quick Installation Guide Increase the gain by one step and run a calibration again. Please check the power level LED at the PA, do not increase the power further when the second green LED is on. Attention:
Always check the output power value to ensure that the level is kept below the calculated max PA output power limit. Attention: Always check that at the PA no red LED is on. In that case reset the PA before the next calibration cycle is started.
If no antenna has reached the 7 volts limit the gain (=power) can be increased again. Always check the power LED when running a new calibration after increasing the gain. The optimum is reached as soon as one Rx antenna comes close to the 7 Volts limit and one green power LED on the PA is on. If this optimum is not reached, please proceed with the next steps, but double check that all connections and settings are correct (-80 Hz offset). If the Rx levels are already at 7 Volts even if the Tx level is still quite low (no green power LED on, just the yellow one left of the green) please proceed with:
- Switch the Receiver Attenuation on WERA Desk (chapter 7.1.5) to 4 dB and increase the PA gain by 3 dB Attention: Always check that at the PA no red LED is on. In that case reset the PA before the next calibration cycle is started.
- Now the voltages should be slightly lower but the PA power level higher. If now one green power LED is on, keep this setting. If still the lower yellow power LED is on switch to 8 dB receiver attenuation and increase the PA gain by another 3 dB.
- Now the voltages should be again slightly lower but the PA power level higher. If now one green power LED is on, keep this setting. If still the lower yellow power LED is on switch to 12 dB receiver attenuation and increase the PA gain by another 3 dB.
- Now the voltages should be again slightly lower but the PA power level higher. If now one green power LED is on, keep this setting. If still the lower yellow power LED is on increase the PA gain by another 3 dB.
- Now the voltages should be again higher but the PA power level as before. If the voltages are now too high switch back to the gain as before and keep that setting
If the voltages are still ok, keep these settings.
Document WERA4-Quick-US-200918 Page 43 of 73 Quick Installation Guide 5.17 Fill-in check list With the finally optimised PA settings one more short calibration with 80 Hz offset should be run. Use the checklist (see attachments) to fill in the measured values. We recommend to use this check list for regular system checks. 5.18 Seal connectors Now all outdoor connectors should be sealed. Also all antenna coils if not yet done. 5.19 Run single acquisition The system performance can be checked now by running a single acquisition. It is recommended to use even for these first tests at least 512 samples. Dont forget to switch off the 80 Hz offset. On all channels the 1st order Bragg lines should be clearly visible. The range for all channels should be similar. Please refer to the following chapters to get instructions about how to run these tests. Final configuration 6. The system configuration file should be pre-configured prior to the installation. If modifications are required, please refer to the WERA user manual, chapter 6: Final Configurations. Document WERA4-Quick-US-200918 Page 44 of 73 7. Software Technical User Guides 7.1 WERA-Desk Control Center Quick Installation Guide To start WeraDesk from a browser, enter the following URL:
http://localhost/~wera/WeraDesk.html This page is password protected, please ask for username and password and note this combination at the station and in a safe place in your office. The WeraDesk web page can be used to control the system, perform measurements or configure repetitive automatic measurement cycles. Note that the real status of the system can only be observed from the WERA-Desk Status window. The status window can be opened over the link Open Status Window. The Submit button can be used to submit new settings, while the Reset button can be used to reset all input fields to the last submitted state. Make sure you know what you are doing, or who gets access to this web page, or the system might not operate correctly anymore. Note that this window is not automatically updated. So if another user opens this web page in parallel you will not see his changes until you manually reload the web page. Note that the version number is followed by by the string HZM which indicates that this is a WeraDesk version with special functionality, which may only be obtained from Helzel Messtechnik. Note that some of the features might be deactivated, but will be available on request. Document WERA4-Quick-US-200918 Page 45 of 73 7.1.1 STOP Acquisition Modes Quick Installation Guide Stop any running cycles after they finish; deactivate automatic cycle control; Interrupt/Stop full calibration cycles (if it takes too long); stop test modes; required before other modes can be selected Continuous Acquisition Start continuous acquisition cycles as defined in WeraDesk Permanent Acquisition Start permanent acquisition cycles as defined in WeraDesk Infinite Acquisition Start infinite acquisition cycles as defined in WeraDesk Single Acquisition Start one acquisition cycle immediately Calibration Start one calibration cycle immediately Cont. Calibration Start continuous calibration cycles as defined in WeraDesk Internal Calibration Start an internal calibration cycle Full Calibration Start a full calibration cycles - caution that takes ~ 5 hours Internal Full Calibration Start internal full calibration cycles - caution that takes ~ 5 hours FM RAW Acquisition Run single measurement in chirp mode without internal range resolution. RAW data will be saved. Cont. FM RAW Acquisition Start continuous FM raw acquisition cycles Test Acquisition Test Calibration Switch WERA to chirped mode without storing data; can immediately be stopped Switch WERA to non-chirped (single tone) mode without storing data; can immediately be stopped Test internal Calibration Switch WERA to internal calibration mode without storing data; can immediately be stopped Scan Frequencies Remarks:
Activate a single frequency scan as defined in the frequency management fields
- To dynamically update the 'Maximum Range' and 'Data Acquisition Time' fields, Javascript needs to be enabled for the browser. Do not enter values into these two fields.
If you allow JavaScript to open unrequested windows, a window showing the current WERA status will automatically pop up. (Allow pop-ups for your browser)
- Clicking 'Open Status Window' opens the status window manually. For updating the frequency scan image of the status page the cache of some browsers (e.g. Mozilla and Firefox) must be disabled by setting the cache size to zero. If the frequency scan image is not updated by the browser, manually update the web page e.g. by pressing the F5 key under Firefox or Internet Explorer. 7.1.2 Interrupt Acquisition By selecting this check-box and submitting a stop as acquisition mode, any type of acquisition will immediately interrupted. Automatic cycles will be deactivated. Note that any full calibration measurement is a series of 256 single calibration measurements. By using the interrupt Acquisition check box only the currently running calibration measurement will be stopped. Document WERA4-Quick-US-200918 Page 46 of 73 7.1.3 Process after Measurement Quick Installation Guide WERA Desk provides three options of automatic post processing new WERA data. If the sea echoes check box is marked, the script located at
/home/wera/etc/process_SORT.sh is executed at the end of an acquisition measurement cycle. This script can e.g. process radial current velocities from the measured data and transfer the results to a central server. If the calibr. data check box is marked, the script located at
/home/wera/etc/process_CAL.sh is executed at the end of a calibration measurement cycle. This script can e.g. be used to process automatic directpath test (DPT) measurements. If the FM raw data check box is marked, the script located at
/home/wera/etc/process_RAW.sh is executed at the end of an FM raw acquisition measurement cycle. 7.1.4 Time slot Master Run WERA in time slot 0 - default Slave 1 Run WERA in time slot 1 Slave 2 Run WERA in time slot 2 Triangle Run WERA in triangular sweep mode Remarks Time slots are currently ignored. Use different time offsets in "Cont. Acqu. Start Time" or different "Working Frequency" entries to avoid multiple WERAs to interfere with each other. WeraDesk V2.4 and higher activates in Master mode to chirp up in frequency and in Slave modes to chirp down in frequency. This avoids two WERAs operating at the same frequency to interfere with each other, when run simultaneously (or at least reduces the interference to a minimum). Note that calibration should only be performed in Master mode. 7.1.5 Receiver Attenuation Note that older WERA systems do not support this feature. If available, the input signals of each channel can be attenuated by a fixed value in dB. Some WERA systems got 0 dB and 6 dB receiver input attenuation available, while the latest systems got steps of 0 dB, -4 dB, -8 dB and 12 dB receiver input attenuation. This feature should only be activated, if the direct path signal between TX and RX antenna arrays is too large to further increase TX power. E.g. by activating 8 dB receiver input attenuation, TX power could be increased by +8dB, if possible. By increasing TX power, the signal to (external) noise ratio can be increased. This will result in larger ranges and better coverage of the measurement area. Document WERA4-Quick-US-200918 Page 47 of 73 7.1.6 Calibration Power & TX off Quick Installation Guide Calibration Power field can be used to reduce the direct path TX signal during 'Calibration'
mode. When switching to Calibration (80 Hz offset), the receivers might be overdriven by the direct path signal, if the normal transmit power is kept. This mode enables to add attenuation to the transmitted signal during calibration cycles; it does not have any effect on normal cycles without frequency offset (RX Offset). Note that this option is intended for test measurements only and should not be used for normal operation, because it may add noise. The Calibration Power field has got the following options:
000 Set full calibration power
-01 Reduce calibration power by 1 dB
-02 Reduce calibration power by 2 dB
-nn Reduce calibration power by nn dB If the TX off box is checked, the local transmitter is disabled by programming the TX DDS frequency to Zero (DC). This mode is especially useful for cross calibrations (one WERA transmitting, the other WERA receiving), or during ship calibration. Note that for newer WERA systems only one sweep module (RX) is used to generate LO-
and TX-signals, if the RX-Offset value is set to zero. Only for calibration measurements with a frequency offset between LO- and TX-signal, both sweep modules are programmed. The TX off checkbox will only effect the second (TX) sweep module. So to perform a cross calibration with a newer system, the TX signal can only be set to zero with the checkbox, if an RX Offset value (e.g. 80 Hz) different than zero is selected. 7.1.7 Location Please enter the name of the site [up to 12 characters] into this field. This information will be stored in the header of the data files. It will also be displayed when plotting maps later. 7.1.8 True North Please enter the direction of the receive antenna array referred to North into this field. See the following explanations for the correct definition of true north. Document WERA4-Quick-US-200918 Page 48 of 73 Quick Installation Guide The beam-forming software assumes, that the receive antennas are numbered from 1 to 16 as displayed. So a person standing in front of the receive antenna array with the seaside to the left, will be closest to receive antenna 1. The angle of true north is the angle covered by rotating clockwise from geographical north to the line of the receive antenna array. The angle must be measured up to the left hand side of the antenna line when counting from the first to the last receive antenna, see sketch above. 7.1.9 Latitude & Longitude Please enter the Latitude in degrees [0...90] and minutes into corresponding fields and select N for the northern, or S for the southern hemisphere. Please enter the Longitude in degrees [0...180] and minutes into the corresponding fields and select E for the eastern, or W for the western half of the earth, regarding Greenwich in England. These coordinates should reflect the position of receive antenna 1, as the software normally uses this position as starting point for the beam-forming. These coordinates will be saved in the header of all data files and will be used to identify the station. So these coordinates need to match the settings in the configuration file
/home/wera/etc/params.cfg to enable post-processing. 7.1.10 Time code + Cont. Acq. Start Time The Time Code field has got the following options:
- UTC Refer WERA cycles and data file names to UTC (strongly recommended)
- LOC Refer WERA cycles and data file names to Local Time This information is stored in the header of all data files for evaluation. If the wrong time code is stored, then all post-processing steps will assume a wrong measurement time. By default the operating system of the UPC is configured to use UTC. So this should be selected here. If the system time of the UPC is changed to local time, then this WeraDesk parameter should also be changed to local time (LOC). The Cont. Acqu. Start Time field has got the following options:
- 00 Start continuous measurement cycles with an offset of 00 minutes to a full hour
- nn Start continuous measurement cycles with an offset of nn minutes to a full hour
- 59 Start continuous measurement cycles with an offset of 59 minutes to a full hour Remarks By setting multiple WERAs to a different Cont. Acqu. Start Time, they can be operate in different time slots to avoid one WERA to interfere with another WERA. To set up a timing scheme, also take a look at Cycle Repetition Time and Data Acquisition Time. If the Cont. Acqu. Start Time is set to 59 and the cycle repetition time is set to 10 minutes, then measurements are started at these minutes: 9, 19, 29, 39, 49, 59. Document WERA4-Quick-US-200918 Page 49 of 73 Quick Installation Guide The first measurement will start to the next minute defined by this timing. It will not wait until minute 59. In CPCI crontab mode the measurement will be prepared at the defined time, but acquisition/transmission will start the next minute. The resulting data file will have a time encoding of the real acquisition start, so one minute later than defined in this field. 7.1.12 Use CPCI crontab By selecting this check box, the measurements will be started directly by the crontab of the CPCI computer in the WERA system and not by the crontab of the user interface pc. It can be used to synchronize the start of several WERA systems or remote stand-alone transmitters (SAT) very accurately. This option needs modified hardware compared to the standard WERA system. Only use this option, if your system is capable to do so. 7.1.12 Freq. Management + Prescan + Adapt Frequency Automatic frequency management is available for continuous measurements only, not for single measurements. It requires that an allowed (licensed) frequency range is defined. Please enter the lowest working Frequency into the first field and the highest working frequency in the second field. The format is [nn.nnn] MHz. In continuous mode the system will never operate outside of this frequency band. If two separate frequency bands are available, then enter the start and stop frequency of the first frequency band in the Freq. Management(1) fields and the start and stop frequency of the second frequency band in the Freq. Management(2) fields. Additionally select the check box labelled Enable 2nd Frequency Range. Enabling the Prescan box will start a 1-minute frequency scan of the defined frequency bands 100 seconds before each automatic measurement cycle. Scan data will be stored at the same location as the measurements. If the scan data should be processed and used for automatic adaptation of the working frequency, please also check the box "Adapt Frequency". This will process the scan data and automatically adapt the working frequency. If the box "Prescan" is not checked, while Adapt Frequency is, the "Prescan"
box will be checked automatically, as no frequency adaptation can be done without prescans. 7.1.13 DPT This parameter is used in continuous mode only. By selecting this check box, a short (16 seconds) direct path test (DPT) measurement will be performed 2 minutes before the real measurement starts. It can be combined with a frequency pre-scan. The resulting .CAL file may automatically be processed by the process_CAL.sh script, by selecting the appropriate process after Measurement check box is activated. Note that in the wera crontab the DPT and a frequency scan are initiated within the same minute, but the start of the scan is delayed by approx. 30 seconds, while the DPT starts immediately. WERA4-Quick-US-200918 Page 50 of 73 Document Quick Installation Guide 7.1.14 Bandwidth Reduction This parameter is used in continuous mode only, when pre-scan and frequency adapt is activated. This value needs to be smaller or equal to the bandwidth determined by the range cell depth parameter. If the frequency pre-scan post-processing software cannot find a free gap for the desired sweep bandwidth, then the sweep bandwidth will automatically be reduced step by step, until a useful free gap in the frequency band is found, or until the defined value for this parameter is reached. The next measurement will use the determined sweep bandwidth. As such a change will alter the range cell depth, the amount of range cells will automatically be readjusted at the same time to maintain the same maximum range. Note that the given steps are fixed in the post-processing software. If different values are desired, contact the manufacturer, because modifying the WeraDesk web page only will not work. You might end up with a few very large range cells only. 7.1.15 Working Frequency Please enter the Center Working Frequency into this field. The format is [nn.nnn] MHz. This value is used for single measurements and for continuous measurements if the
"Adapt Frequency" option of the frequency pre-scan is disabled. 7.1.16 Range Cell Depth Ensure that the required bandwidth is available at the selected "Working Frequency"
(which is the center frequency). 7.1.17 Samples per Data Run The actual length of the time series is calculated from the Samples per Data Run and Chirp Length fields. The value 13312 is intended for permanent mode. In permanent mode the amount of possible samples per data run will be re-calculated by taking the cycle repetition time and time for the optional frequency pre-scan and DPT into account. If there is not enough time for the selected amount of samples, the samples will be reduced to a value that fits and can be divided by 128. In this case a warning will be displayed to notify the user. Document WERA4-Quick-US-200918 Page 51 of 73 7.1.18 Chirp Length Quick Installation Guide The chirp length value defines the duration in seconds of each linear frequency sweep. The Chirp Length field has got the choice as listed in the pull-down menu. We recommend to use one of the chirp rates listed below:
Chirp length Doppler spectra Optimum operating Comment width 0.216667 2.308 Hz 0.260000 1.923 Hz 0.433333 1.154 Hz 0.520000 0.962 Hz frequency 43.2 MHz 30.0 MHz 10.8 MHz 7.5 MHz Best for 60 Hz line freq Best for 50 Hz line freq Best for 60 Hz line freq Best for 50 Hz line freq 1.876875 This is the duration of the chirp during frequency scans Remarks There are some restrictions regarding the choice of the chirp length:
1.) The chirp length must be kept synchronous with the sample rate to maintain phase continuity. So only certain chirp length values are allowed for the fixed sample rate. 2.) It is recommended to keep the chirp length synchronous with the period of the line frequency (0.02 sec for 50Hz or 0.0167 sec. for 60 Hz). If this is not the case, the net frequency and its harmonics can produce artifacts that might disturb the Bragg lines. Chirp length values of 0.2600 and 0.5200 are synchronized to 50 Hz net frequency, values of 0.2167 and 0.4333 to 60 Hz net frequency. Different unsynchronized values should be tested for each system and the resulting Bragg spectra examined, before activating automatic cycles. Note that an unstable line frequency will smear out the line artifacts into the Bragg spectrum. So a minimum offset to the Bragg lines should be kept. If a chirp length is selected, which is not synchronized to line frequency, then select a shorter chirp length for your operating frequency regarding the row Optimum operating frequency. 7.1.19 Range Offset This parameter is used to correct the absolute range measured by the WERA by the offset introduced by cable delays. Both Rx and Tx cable lengths must be taken into account. This value is not directly the cable length. It needs to be calculated for free space, so the velocity factors of the cables need to be taken into account. A radio wave travelling in a coaxial cable will have a shorter wavelength than a radio wave of the same frequency travelling in free space. The signal is slower inside the cable. The velocity factor, which can be different for different types of cable, is a factor expressing this difference relative to the radio wave in free space. The chosen range cell depth value is the value in meters for one complete range cell. Note that in the header of the resulting data files this value will be saved as multiple of one range cell. Document WERA4-Quick-US-200918 Page 52 of 73 Quick Installation Guide 7.1.20 Cycle Repetition Time The Cycle Repetition Time field is used for continuous measurements. It is a repetition time in minutes. Examples:
- 01
- nn
- 60 Remarks
Repeat a measurement cycle every 1 minutes Repeat a measurement cycle every nn minutes Repeat a measurement cycle every 60 minutes The Cycle Repetition Time must be larger than the Data Acquisition Time. Only for permanent mode a shorter time may be entered. In that case the software will automatically adapt the amount of samples to fit into the cycle repetition time. If the frequency pre-scan or DPT option is used, then the Cycle Repetition Time must be larger than the Data Acquisition Time plus 2 minutes. The measurement cycles will be reset at the end of each hour. So if equidistant measurement times are desired, then 60 minutes should be dividable by the cycle repetition time. 7.1.21 Number of Range Cells A value between 32 and 256 needs to be selected. By multiplying the number of range cells with the range cell depth in meters, the maximum processed range in meters can be obtained. This value depends on the range cell depth, and on the real range of first order Bragg lines of the station. If this value is configured too small, then the Bragg lines will be cut and data is lost for far ranges. If this value is configured too large, then the data files will grow in size without getting more information. This can rapidly fill up your data disk. Remarks
- The Number of Range Cells should not be set to values larger than the working range physically possible by WERA due to the attenuation of the ground wave.
- This value should be monitored and readjusted after having installed the system. If the option bandwidth reduction is used, then the amount of range cells may vary from measurement to measurement. 7.1.22 Maximum Range The value of this field is calculated by multiplying the Range Cell Depth with the Number of Range Cells. Cant be modified. Document WERA4-Quick-US-200918 Page 53 of 73
7.1.23 Data Acquisition Time Quick Installation Guide The value of this field is calculated by multiplying the Samples per Data Run with the Chirp Length. Cant be modified. 7.1.24 RX Offset This is an optional frequency offset between TX- and LO-signal. It is normally only used for calibration measurements to enable the test signal to pass the receivers high pass filters. By default an offset of 80 Hz should be used for all calibration measurements. For normal acquisition measurements this value should be set to 0Hz. While in the original WeraDesk software only one table with values was available, newer WeraDesk versions will use different DDS step values to program the RX Offset value, depending on the frequency of the master clock. Remark When a chirp length of 0.26 s is selected, 80 Hz RX Offset refers to a signal at about 0.5 Hz Doppler shift at range cell 20. 7.1.25 Data Path Please enter the path to directory where to store the measured data [up to 30 characters] into this field. In permanent or infinite mode _ characters should not be used to avoid problems when post-processing. 7.1.26 File Location ID Please enter a 3-character code to identify the radar site into this field. This code is included into the measurement data file names to distinguish between the sites, e.g. yyyydddhhmm_cod.SORT 7.1.27 Comment You may enter comments for the site or measurement campaign [up to 80 characters]
into this field. This comment is included into the header of each data set. Document WERA4-Quick-US-200918 Page 54 of 73 7.1.28 Clock Quick Installation Guide In this field the software displays the currently configured master clock frequency. For systems with an older clock module the value should be set to 90.7 MHz. All new systems operate at 90.0 MHz. This parameter is defined by the file /home/wera/etc/WERA_Clock.asc. If a newer 90 MHz master clock is used, this file must be existent and contain the string 180.000000 in the first line. If a newer 90.7 MHz master clock is used, the file should be renamed, removed or contain a different string. After any changes regarding this file at least one stop command needs to be submitted under WeraDesk to update the web page and display the correct values for the used clock frequency. If the wrong master clock frequency is defined, the wrong sample rate will be used and the measurement will be invalid. In this case the Bragg lines in the range Doppler maps will not be vertically anymore. 7.2 WERA-Desk Status window The Status Page reflects the actual status of the WERA system and is automatically updated every 5 seconds (You need JavaScript for the update to work). Document WERA4-Quick-US-200918 Page 55 of 73 Quick Installation Guide For a description of most of the parameters see the description of WeraDesk in the previous chapter. The plot in the frequency management section displays an average of the external noise measured during the last frequency pre-scan. The last line shows the status of the measurement cycle on the left side and the status of automatic cycles (by crontab) on the right side.
"Close This Window" closes the status page, which can be re-opened from the WeraDesk main page. If the web browser caches the graphics, the web page might need to be updated manually to reload the frequency pre-scan graphics. For the Firefox and Internet Explorer web browsers this can be done by pressing the F5 key. 7.3 WERA Status overview On each WERA UPC the results of regularly processed measurement can be viewed via web. These pages can be accessed via the start page of WERA Control Center. To display the start page on the UPC, enter the URL http://localhost/~wera/ . To access this page over the internet, replace localhost with the ip adress of the UPC. An overview of the last processed measurement results can be obtained, if you click on Latest WERA results. An overview of all processed results can be reached with a click on WERA status overview, this will open a list of directories, coded by the day. In these directories are sub-directories for the time, coded in hour and minutes of acquisition time. Document WERA4-Quick-US-200918 Page 56 of 73 Quick Installation Guide With a click on the desired directory the contained status overview web page will be opened. Each status overview displays some information about the last measurement, followed by plots of radial sea surface current, radial sea surface current power level, radial current noise level, radial current signal to noise level and a plot of external frequency usage over time from the last frequency scan. Below that are some beam-formed Bragg spectra, followed by a Bragg spectrum for each receive antenna. By visually checking and comparing the results, defective receive channels/antennas or other problems may be spotted. The example plots show part of the gulf stream on the east coast of the USA with a distance of more than 140 km from the coast. By clicking on any of the small graphics a larger version with more detail may be opened. Document WERA4-Quick-US-200918 Page 57 of 73 Quick Installation Guide These status overviews are generated by the script /home/wera/etc/process_SORT.sh if automatic post-processing of sea-echos is selected under WeraDesk. In the script status overview creation times (hour and minute) should be configured. Normally a status overview every few hours is sufficient. 7.4 WERA voltage overview (optional) If the latest WERA remote control software is running and configured to regularly measure the voltages and temperatures of the WERA racks, then it will generate a web page with plots of these parameters over time. This information can be useful to monitor the status of the electronics power supplies, fans and the air conditioning in the building. 7.5 WERA DPT (Direct Path Test) comparison overview plots (optional) If a time window of 2 minutes before the next measurement is available, it can be useful to activate a Direct Path Test measurement by selecting the check boxes DPT and Process after Measurement: Calibr. Data under WeraDesk. The DPT comparison plots are displaying the main test signal information of the last DPT for all receive channels in one plot. Additionally reference data will be shown (derived from a real measurement or theory) to see, if something has changed since the reference was saved, or to see how well the phase values fit the theory. Note that depending on the site (layout, landscape, surrounding infrastructure) the DPT test signal might not travel the standard path and thus the derived values might be completely different than the theoretical values. With these plots problematic receive channels can easily be detected. See the example plots below. Document WERA4-Quick-US-200918 Page 58 of 73 Quick Installation Guide The light grey lines in the background show the reference DPT data. In this example it can be seen that the RMS voltages have all dropped compared to the reference (from a real measurement after initial installation), but they are linearly increasing, which looks good. The phases look very good, too. Note that only phase values between +/-180 degrees are measured. That is why the phases of channel 11 and 12 in the following plot seem to be shifted.
(See channel 11 in the plot: +140 degrees=+140-360= -220 degrees) For a standard antenna distance of 0.45 lambda the phases between the receive channels should be around 162 degrees for the DPT signal. But note that due to the landscape the DPT signal might not be able to travel the shortest route to all antennas and this will change the phases. 7.6 WERA DPT (Direct Path Test) time series overview (optional) With the DPT time series of measurements it is possible to retrieve information about antenna behavior. Often it is possible to detect a degrading receive antenna before it fails completely. Additionally the time series will show, if some of the receive channels are sometimes overdriven by the TX signal. The RMS voltages of each receive antenna should always be below 7 V. For each receive channel plots like these will be available:
Document WERA4-Quick-US-200918 Page 59 of 73 Quick Installation Guide By default a link to this web page is available on the start web page:
Since WeraDesk 3.0.6HZM a DPT measurement can be configured by just selecting the DPT check box when submitting settings for continuous cycles. For manual installation instructions see chapters 6.7 Create direct path test setup and 6.8 Set up your individual wera crontab. 7.7 WERA DPT (Direct Path Test) spectra overview (optional) If the automatic DPT test measurement has been activated, then additionally to the comparison plots and time series from chapter 7.5 and 7.6 plots of the last spectra for each receive channel are being generated. The plots from time step (t-0) are from the last automatic DPT measurement, (t-1) from the previous one and so on. In case there is noise on one channel, which is weaker than the test signal, it can be seen in these plots, as well as in the status overview plots of chapter 7.3. If the noise is aused by a loose contact, some plots will show the noise and some not. The test signal displayed at -80 Hz in the spectrum also gives an information about the decoupling between TX and RX antennas. As long as the test signals of all receive antennas are below 0 dB, they are not yet overdriven. In that case the difference between the strongest test signal and the 0 dB line is the maximum that the TX power might be increased without overdriving the receivers. But there may be limitations by the possible PA gain and the allowed transmit power. So this plot may also be used to adjust the gain of the PA. 7.8 WERA Hard disk Usage overview (optional) It can be useful and informative to monitor the usage of the partitions of the hard disks of the control pc over time. Document WERA4-Quick-US-200918 Page 60 of 73 Quick Installation Guide It is possible to graphically predict the best time to replace a data disk or just to monitor if data files are generated continuously. For this purpose the script /home/wera/etc/Harddisk_Usage.sh has been programmed. This script will determine the hard disk usage of all defined hard disks or partitions and store the values in a file, including a time stamp. Then a plot over the last months is generated for each device, and a web page created. It might be needed to modify the device names of the hard disks in the script. By copying some lines of code, the script can easily be extended to display even more hard disks or partitions, e.g. external backup disks. 7.9 WERA UPS overview (optional) If the manufacturer of the used UPS supports a web based interface, this can optionally be linked here. 7.10 WERA Remote Control The software tool WERA Remote-Control is intended to read the actual voltages and temperatures out of one WERA system equipped with a power supply rack with hardware version 4.0 or later. Furthermore you are able to get access to the power supply of the system in case of shutdown/restart and maintenance. This can be done via internet remote access or sitting in front of the WERA system on-site. Its used as an graphical user interface giving the operator a fast overview of system performance and service/maintenance information. Depending on the hardware of the power supply rack (PSR), different software versions are needed. Since hardware version 4.0 of the power supply rack, the software WERA Remote-Control V3.0x is needed. For older PSR hardware versions WERA Remote-Control V2.6x should be used. 7.10.1 WERA Remote-Control 3. xx The software tool WERA Remote-Control V3.xx is intended to read and display the internal supply voltages and temperatures and optionally forward and reflected power of one WERA system. Furthermore it enables the user to remotely control the system in different ways. This is useful in case it is needed to shut down or restart part of the system or for maintenance/adjustments. Document WERA4-Quick-US-200918 Page 61 of 73 Quick Installation Guide This software tool got a graphical user interface, giving the operator a fast and easy overview of hardware status, system performance and service/maintenance information. The software can either be operated sitting in front of the WERA system on-site, or remotely by logging in to the graphical user interface via internet remote access. Software like NX NoMachine, TeamViewer, OpenVPN or similar may be used for this purpose. This document contains an overview of the configuration possibilities of this software tool. WERA Remote-Control V3.xx may only be used in combination with a WERA system equipped with a power supply rack with hardware version 4.0 or later. If you got an earlier hardware version of the power supply rack, you may use V2.6 of the software. 7.10.1.1 WERA Remote-Control-Window The WERA Remote-Control-Window is the main window of the whole program. For the operator the actual system voltages, WERA power status, clock and additional options are displayed here. Please have a look at following list to get further details. Figure: 1 main window You can see the actual measured supply-voltages of each used rack (FCR - frequency control rack, RER1 - receiver rack 1, RER2 receiver rack 2) and the temperature in degrees inside each rack. If a newer version of the power amplifier (PA) is connected, the voltages, temperature and forward and reverse power at the output can also be displayed, as well as the set overall gain of the power amplifier (PA), or if the power amplifier (PA) has been set to standby mode or if the automatic self-protection circuit got triggered. Document WERA4-Quick-US-200918 Page 62 of 73 Quick Installation Guide If the values are within the valid range, the colour of the displayed values turns green. If not , the colour is changed to red. The temperatures might also be displayed in yellow colour, if the temperature is just below the limit or if the racks are still switched off to cool down. In addition you can see the maximum temperature, that is allowed inside the racks
(FCR and RER). If one temperature is going above this limit, the WERA-system will automatically be switched off and will not automatically be switched back on again, before the temperature in all these racks has fallen at least 5 C below the limit. At the bottom of the window there is an information field, which informs you about the actual software progressing steps. If a problem is detected, the software will also display help information here like possible error sources that should be checked. There is a status overview in the group-box Power. You can see here if the AC voltages distributed by the Power Supply Rack (PSR) to the individual racks are switched ON or OFF. Additionally you can see the status of the optional digital output of the PSR, which may be used to control external hardware. When you click on the button check system now, new values will be read in and the display will be updated. Over the Settings menu or with the help of some shortcuts, you can open the configuration-windows:
Ctrl-W opens the window WERA-Setup Ctrl-Q quits the program 7.10.1.2 WERA Setup-Window System Power, hardware and system check timing configuration tab This section of the setup window helps you to control the AC power distribution to the individual WERA racks and other external equipment connected to the spare (Aux 1 /
Aux 2 (optional)) outputs. The optional Digital Out relay can be used to switch an externally supplied DC voltage. Its main function is to reset a modems/routers supply voltage, if the internet connection is lost. See section 4 WERA Setup-Window Modem tab for details. The standard power configuration is:
System Power ON Power Amplifier FCR RER 1 RER 2 ON ON ON Aux 1 Aux 2 Digital Out ON OFF OFF OFF The new setting will immediately be used after clicking the button set relays now. Additionally this window is used to activate the automatic system check and configure the interval. By default this should be activated and set to once per hour, but sometimes a shorter repetition time might be useful. During the system check, the voltages, temperatures and forward/reverse power of the FCR, RER, RER 2 and PA are read in and displayed in the main window. If the Document WERA4-Quick-US-200918 Page 63 of 73 Quick Installation Guide temperature in one of the racks exceeds the user defined limit, the system will automatically be switched off as a self protection mechanism against overheating. The system will be switched back on the next system check cycle, if the temperature has dropped at least 5C below the limit again. So please choose your temperature limit depending on the external conditions. You can choose between 40 and 50 degrees celsius in five degree steps. In a well tempered air conditioned room a setting of 40 to 45 degrees should be OK. Note that the temperature sensors off these racks are supplied with +5V from the PSR, so temperatures can even be read out while the racks are switched off. Optionally the keep alive racks and keep alive RTU may be selected and executed together with the automatic system check. If keep alive racks is selected, the software may automatically switch off and back on a rack, if the measured supply voltages for this rack all seem to be wrong, and if the software thinks this rack should be switched on now. This option should only be used, if a rack seems to have been switched off for an unknown reason. Normally it is not needed. It may even cause problems if somebody is troubleshooting the hardware, or if the software got false readings. If keep alive RTU is selected, the software will try to ping the RTU if the FCR should be switched on. If the ping fails three times, the software will automatically switch off and back on the FCR to reset the RTU. Normally this should not be needed due to the hardware watchdog of the RTU, but it should be safe to keep this option selected, and may help to loose data files. Since version 3.27 the available hardware versions of the FCR and RER need to be defined. The different hardware versions got different internal supply voltages. If the wrong hardware is selected, wrong warnings will be generated. Note that WERA II RER contain up to 8 receiver modules, while WERA IV RER contain up to 12 receive channels. The software is currently configured to support up to 16 receive channels. So if a WERA IV RER is available, it is assumed that there is only one RER. Document WERA4-Quick-US-200918 Page 64 of 73 Quick Installation Guide Figure: 2 setup window System tab If you finished configuring the software, click on save to save your settings or on save and close to close the setup window. If you want to discard your changes, then click on close setup. 7.10.1.3 WERA Setup-Window PA (Power Amplifier) tab This section of the setup window can optionally be used to control a newer version rack mounted power amplifier and check its status. Figure: 3 setup window PA tab Document WERA4-Quick-US-200918 Page 65 of 73 Quick Installation Guide If the Check PA voltages, power and temperature check box is selected, these parameters will automatically be read out together with the automatic system check. The PA gain control can be used to manually change the overall gain of the power amplifier by selecting the desired radio button and then pushing the Submit button. This option may only be used while the system is stopped, or the PA is set into standby mode. With the PA Configuration radio button the correct PA version needs to be selected. The displayed PA versions got different internal supply voltages. If this selection is wrong, the system will send out wrong error messages claiming that one of the internal voltages is wrong. With the PA Error Check button it may be manually read out, if the PA is in self-
protection mode. If everything is OK the status message will display the text OK. If the PA is in self-protection mode or if there is no control cable to the PA connected, the status message will display error/unconnected. Note that if the supply voltages and temperature of the PA displayed in the main window do all make sense, and the status displays error/unconnected, then the PA should be in self-protection mode. If all these parameters seem to be wrong, the control cable is not connected, or the PA is not switched on. With the PA Error Reset button the self-protection circuit of the PA may be manually reset. This option may only be used while the system is stopped, or the PA is set into standby mode. By selecting the activate standby mode check box and then pushing the Set button, the PA will be set into standby mode. To wake up the PA again, de-select the check box and push Set again. Note that it is possible to change the gain of the PA or reset the self-protection circuit while the PA is set to standby mode. Further note that the settings for PA gain and standby mode will be saved if the save or save + close buttons are pressed. The next time the software is started, or the FCR reboots, the PA will automatically set to these values. This setting might need some seconds. If you finished configuring the software, click on save to save your settings or on save and close to close the setup window. If you want to discard your changes, then click on close setup. 7.10.1.4 WERA Setup-Window Low Power tab In the Low Power section of the setup window it is possible to activate the Low Power Options by selecting the corresponding check box. Document WERA4-Quick-US-200918 Page 66 of 73 Quick Installation Guide When this option is activated, the software will automatically switch off the selected WERA racks in between the measurements in continuous acquisition measurement mode. This may be useful for installation in remote places, which are running from off-grid by renewable energy or generators. With the check boxes the user may select which AC outputs of the PSR should be switched off. Over a drop-down box it may be selected how many minutes before the next measurement the racks should be switched back on again. Note that depending on the temperatures the electronics might need some time to reach nominal temperature for optimum performance. Note that this mode may only be activated after continuous acquisition mode has been started over WeraDesk. The information text field on the right will display parameters from the active acquisition mode and the scheduled timing to switch on and off the AC voltages. Figure: 4 setup window Low Power tab If you finished configuring the software, click on save to save your settings or on save and close to close the setup window. If you want to discard your changes, then click on close setup. 7.10.1.5 WERA Setup-Window Modem tab In the Modem section of the setup window the self-acting modem test can be controlled. The test is verifying a valid internet-connection by pinging up to two ip addresses like www.yahoo.com and www.google.com. If from both addresses no response is received after several tries, the selected relays are switched to the opposite setting from the WERA System power tab for a short time, then switched back. Document WERA4-Quick-US-200918 Page 67 of 73 Quick Installation Guide This option may be useful if you got an unstable router or modem for the network connection, which needs to be reset automatically to dial into the internet again. Please activate the checkbox at the top, if you want to use this option, and make sure the correct port is defined. This modem test will be executed together with the automatic system test. To manually test the internet connection, please click on the corresponding TEST button. Make sure that no hardware is connected to the selected ports, which should not be switched off. Further note that the PSR in the WERA IV FCR or later do not have got the optional Digital Out and Aux2 outputs. Figure: 5 setup window Modem tab If you finished configuring the software, click on save to save your settings or on save and close to close the setup window. If you want to discard your changes, then click on close setup. 7.10.1.6 WERA Setup-Window Warnings tab In the Warnings section of the setup window the automatic generation of warning and status messages for the WERA warning system can be configured. Document WERA4-Quick-US-200918 Page 68 of 73 Quick Installation Guide Figure: 6 setup window Warnings tab If the activate warning system check box is selected, the software will generate warnings and status messages. These messages will be saved in the displayed directory with the shown file ending. By default this is
/home/wera/SystemMonitor/outbox/. If you want to use a different directory or file ending, you may manually edit the configuration file setup.txt. But this is not recommended, because the standard WERA warning system will handle messages in the default directory only. For each site a unique site name should be used to be able to identify, which WERA station send out the message. It is recommended to use the same site name for all parts of the warning system. With the check boxes in the warning Selection group box the user can select what kind of warnings should be generated. The Priority, Recipients and Message list boxes may be filled with customized values, but should normally kept at default values. The Source parameter should normally not be modified, but this would also manually be possible in the configuration file setup.txt. For more information about the meaning of these parameters read the document Manual-SystemMonitor-131017.pdf or a later version, which describes the warning system on server side. Note that there are buttons to reset the parameters to default or generate a test message. If you finished configuring the software, click on save to save your settings or on save and close to close the setup window. If you want to discard your changes, then click on close setup. Document WERA4-Quick-US-200918 Page 69 of 73 Quick Installation Guide 7.10.1.7 WERA Setup-Window Email tab The Email section of the setup window is not activated. In the future this section could be used to configure warning emails, which may automatically be send out if an error has been detected. If you need this feature, please contact the Helzel team Note that this feature is now being replaced by the warning system. If you finished configuring the software, click on save to save your settings or on save and close to close the setup window. If you want to discard your changes, then click on close setup. 7.10.1.8 WERA Setup-Window Info tab The Info section of the setup window contains the information about the valid voltage ranges of each supply-voltage in each rack. Note that some supply voltages depend on the hardware version being installed. Figure: 8 setup window Info tab Document WERA4-Quick-US-200918 Page 70 of 73 Quick Installation Guide If you finished configuring the software, click on save to save your settings or on save and close to close the setup window. If you want to discard your changes, then click on close setup. Since version 3.0.2 of the software, the manual can directly be opened over a link in the main menu. 7.11 WERA Advanced Settings WERA Advanced settings is an web-based editor for settings of the WERA system which are hidden in /home/wera/etc and changed seldom. It has two layers of access control: First the standard mode for more often accessed settings and a special user who also can change settings, not used so often with the help of the Advanced settings mode. For details see the corresponding section in the complete WERA manual. 7.12 WERA UPS overview (optional) It is strongly recommended to use a UPS unit to buffer at least the WERA User Interface PC. Please refer to the operators manual of the used device. 7.13 WERA Remote Control The software tool WERA Remote-Control is intended to read the actual voltages and temperatures. For further details plese refer to the WERA manual chapter 7.8 There you will find all required settings to generate automatic warnings etc. Data processing scripts 8. These scripts are used to carry out specific software tasks after each measurement. Please refer to the WERA user manual chapter 8 if some settings might need to be modified. 9. Data formats There are various data formats used after each processing step. Please refer to the WERA user manual to get details about the formats. 9.1 9.2 9.3 9.4 9.5 9.6 9.7 RAW SORT - WERA range resolved data SPEC - WERA Spectra on UV-Grid (.spec) crad and wrad Current and wave radial data cur_asc, wav_asc and win_asc CAL - WERA Calibration data USORT - unsorted RAW data 10. Data processing tools All WERA data processing programs are command line tools. So a base knowledge of UNIX/Linux shell use is very advantageously. Please refer to the WERA user manual for details. Document WERA4-Quick-US-200918 Page 71 of 73 Quick Installation Guide 11. Visualization In a standard application the visualization takes place on the WERA Server. For this reason please refer to the WERA Server Manual for all visualization and data management options. All WERA data processing programs are command line tools. So a base knowledge of UNIX/Linux shell use is very advantageously. Please refer to the WERA user manual for details. Document WERA4-Quick-US-200918 Page 72 of 73 Quick Installation Guide 12. Installation Checklist Name of Site Pos 11 Co-ordinates of Rx 1 of last Rx Tx center position Container position Radial type LON:
LON:
LON:
LON:
LAT:
LAT:
LAT:
LAT:
Txmin Distance between poles Type of array:
13 Height of antenna foot Rxmin Rxmax Txmax 14
(a) Calibration, Internal
/home/wera/etc/calibration.wera_internal___________
(b) Cable calibration
/home/wera/etc/calibration.wera_cable_____________
(c) Optional Ant. Cal.
/home/wera/etc/calibration.wera_ant_______________
(d) other methods
/home/wera/etc/calibration.wera_xxx_______________ 15 Calibration activated:
file name: (a) (b) (c) (d) calibration.wera Sign:
17 Antenna Test Tx #1 Antenna Test Tx #2 Antenna Test Tx #3 Antenna Test Tx #4 fo:
fo:
fo:
fo:
with one Tx antenna:
with Tx array:
18 Direct Path Test (DPT) Rx # 1 in Volts Rx # last in Volts Range in km Directivity D = VoneTx / VTx-array D = dBoneTx - dBTx-array D =
D =
Optimise Tx power: Rx # 1 in Volts Rx # last in Volts Range in km Tx-Power / Rec-Atten VSWR:
VSWR:
VSWR:
VSWR:
BWSWR2:
BWSWR2:
BWSWR2:
BWSWR2:
19 Perform DPT, file at:
/home/wera/etc/calibration.wera_DPT________________ 21 All Antennas checked Date:
Sign:
and sealed Document WERA4-Quick-US-200918 Page 73 of 73
1 2 | label and location | ID Label/Location Info | 294.36 KiB | September 30 2020 / October 02 2020 |
Select !
120/240V e@*
-21V FCRI SerialNo.:
Monitor FCR-815-37 V3.12 fouT Cal-Out Lo-Out TIN]
Keyboard ~
@: (06 oS ie _|
1 2 | LTC request | Cover Letter(s) | 597.98 KiB | October 02 2020 |
Long/Short-term Confidentiality Request Date: 01 October 2020 Federal Communications Commission 445 12th Street, SW Washington, DC 20554 FCC ID: 2AV3S-WERA To Whom it may concerns, Pursuant to sections 0.457(d) and 0.459 of CFR 47 and to avoid premature release of sensitive information prior to marketing or release of the product to the public, we hereby requests long-term confidential treatment of information accompanying this application as outlined below:
Schematics Block Diagram Operational Description Parts List Tune-Up Info In addition we hereby request the following exhibits contained in this application to be temporarily (short-term confidentilality) withheld from the public disclosure for an initial period of days until:
not applicable External Photos Internal Photos Test Setup Photos Users Manual The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these matters might be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to rule 0.457(d), disclosure of this application and all accompanying documentation will not be made before the date of the GRANT for this application. If you have any questions, please feel free to contact me. Yours sincerely, Sabrina Berghahn Authorized Agent
1 2 | TuneUP | Parts List/Tune Up Info | 518.76 KiB | October 01 2020 |
Tune up Instructions Tune up Instructions Version 1.0 September 2020 HELZEL Messtechnik GmbH Carl-Benz-Strasse 9 24568 Kaltenkirchen, Germany www.helzel.com e-mail: wera@helzel.com Tel.: +49 (0) 4191 - 95 20 0 Fax: + 49 (0) 4191 - 95 20 40 Document WERA4-Tune-up-Instruction-200919 Page 1 of 4 Tune up Instructions 1. Calculate the maximum permitted output power of the power amplifier The radiated HF power must be kept below the defined maximum radiation power for Ocean Radar of 50 WERIP (47 dBm). Please note that the WERA power amplifier is capable to provide up to 49 dBm to compensate for cable losses for cases with the Tx antenna system installed in a distance of several 100 Meters. The maximum permitted output power for a specific installation can be calculated:
max PA output level = max radiation antenna gain + cable loss If the radiation cant be measured in the field, the antenna gain should be assumed as best case which is 6 dB. The cable loss depends on the cable length and the attenuation of the used cable type. Please contact the manufacturer to get the according value for your site specific set-up. 2. Adjust the output power of the power amplifier The output power can be set in steps of 3 dB and must always be adjusted to be below the calculated permitted radiation level. The output power of the power amplifier, see picture below (Fig. 1), is normally adjusted via remote control. If for any reason the remote control is not available the power can be adjusted manually by means of the black knob at the front. This manual setting is accessible when removing the plastic cover at the front. Figure 1: Power Amplifier Document WERA4-Tune-up-Instruction-200919 Page 2 of 4 Tune up Instructions Please ensure that the Tx antennas are tuned correctly and all cables are connected. It is strongly recommended to start the tune-up procedure with lowest output power. The output power can be adjusted manually or via remote access. The remote access is the preferred option. It accessible via the Remote Control program, the window below (Fig. 2) will show up and gives the user access to the settings and displays the measured values. Forward Power Reflected Power Figure 2: Remote Control Interface Please click on Settings to access the PA window, see figure 3. Figure 3: PA setup window Document WERA4-Tune-up-Instruction-200919 Page 3 of 4 Tune up Instructions As a first step the output power need to be adjusted to a minimum, that means the PA gain should be set to 20 dB. Click on Submit and save + close to active the setting and return to the initial window (fig. 2).
- Now run a short calibration measurement (80 Hz frequency offset).
- Click on check system now to get the power amplifier output power reading.
- Check the results using Plott_WERA_Cal_lsq according to the description of chapter 11.7 of the Quick Installation Guide.
- All rms voltages are expected to be below 7 Volts
Increase the gain by one step using the PA setting window and run a calibration again. Attention: Always check the output power value to ensure that the level is kept below the calculated max PA output power limit.
If no antenna has reached the 7 volts limit the gain (=power) can be increased by one step again. The optimum is reached as soon as one Rx antenna voltages reaches a value close to the 7 Volts limit.
If this optimum output power is more than 4 dB lower as the calculated max PA output power, the receiver sensitivity can be reduced, please refer to chapter 7.1.5 of the Quick Installation Guide.
- After increasing the Receiver Attenuation by 4 dB the power can be increased by another step and the output power and the rms voltages should be checked again. This procedure can be repeated until the Receiver Attenuation reached a value of 12 dB. Attention: Always check that at the PA no red LED is on. In that case reset the PA before the next calibration cycle is started. Document WERA4-Tune-up-Instruction-200919 Page 4 of 4
frequency | equipment class | purpose | ||
---|---|---|---|---|
1 | 2020-10-02 | JAB - Part 15 Class B Digital Device | Original Equipment | |
2 | 2020-10-01 | 16100 ~ 16200 | MRD - Marine Radar |
app s | Applicant Information | |||||
---|---|---|---|---|---|---|
1 2 | Effective |
2020-10-02
|
||||
1 2 |
2020-10-01
|
|||||
1 2 | Applicant's complete, legal business name |
HELZEL Messtechnik GmbH
|
||||
1 2 | FCC Registration Number (FRN) |
0029390168
|
||||
1 2 | Physical Address |
Carl-Benz-Str. 9
|
||||
1 2 |
24568
|
|||||
1 2 |
Kaltenkirchen
|
|||||
1 2 |
Germany
|
|||||
app s | TCB Information | |||||
1 2 | TCB Application Email Address |
v******@phoenix-testlab.de
|
||||
1 2 | TCB Scope |
A1: Low Power Transmitters below 1 GHz (except Spread Spectrum), Unintentional Radiators, EAS (Part 11) & Consumer ISM devices
|
||||
1 2 |
B2: General Mobile Radio And Broadcast Services equipment in the following 47 CFR Parts 22 (non-cellular) 73, 74, 90, 95, 97, & 101 (all below 3 GHz)
|
|||||
app s | FCC ID | |||||
1 2 | Grantee Code |
2AV3S
|
||||
1 2 | Equipment Product Code |
WERA
|
||||
app s | Person at the applicant's address to receive grant or for contact | |||||
1 2 | Name |
T****** H******
|
||||
1 2 | Title |
President
|
||||
1 2 | Telephone Number |
04191********
|
||||
1 2 | Fax Number |
+4941********
|
||||
1 2 |
h******@helzel.com
|
|||||
app s | Technical Contact | |||||
n/a | ||||||
app s | Non Technical Contact | |||||
n/a | ||||||
app s | Confidentiality (long or short term) | |||||
1 2 | Does this application include a request for confidentiality for any portion(s) of the data contained in this application pursuant to 47 CFR § 0.459 of the Commission Rules?: | Yes | ||||
1 2 | Long-Term Confidentiality Does this application include a request for confidentiality for any portion(s) of the data contained in this application pursuant to 47 CFR § 0.459 of the Commission Rules?: | No | ||||
if no date is supplied, the release date will be set to 45 calendar days past the date of grant. | ||||||
app s | Cognitive Radio & Software Defined Radio, Class, etc | |||||
1 2 | Is this application for software defined/cognitive radio authorization? | No | ||||
1 2 | Equipment Class | JAB - Part 15 Class B Digital Device | ||||
1 2 | MRD - Marine Radar | |||||
1 2 | Description of product as it is marketed: (NOTE: This text will appear below the equipment class on the grant) | Ocean Radar | ||||
1 2 | Related OET KnowledgeDataBase Inquiry: Is there a KDB inquiry associated with this application? | No | ||||
1 2 | Modular Equipment Type | Does not apply | ||||
1 2 | Purpose / Application is for | Original Equipment | ||||
1 2 | Composite Equipment: Is the equipment in this application a composite device subject to an additional equipment authorization? | Yes | ||||
1 2 | Related Equipment: Is the equipment in this application part of a system that operates with, or is marketed with, another device that requires an equipment authorization? | No | ||||
1 2 | Grant Comments | Power listed is conducted. The antenna installation and operating configurations of this transmitter, including any applicable antenna gain and cable loss must satisfy MPE categorical Exclusion Requirements of §2.1091.. Users and installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance. | ||||
1 2 | Is there an equipment authorization waiver associated with this application? | No | ||||
1 2 | If there is an equipment authorization waiver associated with this application, has the associated waiver been approved and all information uploaded? | No | ||||
app s | Test Firm Name and Contact Information | |||||
1 2 | Firm Name |
PHOENIX TESTLAB GmbH
|
||||
1 2 | Name |
H****** B****
|
||||
1 2 | Telephone Number |
49-52********
|
||||
1 2 | Fax Number |
49-52********
|
||||
1 2 |
o******@phoenix-testlab.de
|
|||||
Equipment Specifications | |||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Line | Rule Parts | Grant Notes | Lower Frequency | Upper Frequency | Power Output | Tolerance | Emission Designator | Microprocessor Number | |||||||||||||||||||||||||||||||||
1 | 1 | 15B | |||||||||||||||||||||||||||||||||||||||
Line | Rule Parts | Grant Notes | Lower Frequency | Upper Frequency | Power Output | Tolerance | Emission Designator | Microprocessor Number | |||||||||||||||||||||||||||||||||
2 | 1 | 9 | 5250 | 5275 | 38.01 | 100 ppm | 25K0A1A | ||||||||||||||||||||||||||||||||||
2 | 2 | 9 | 13400 | 13600 | 30.2 | 100 ppm | 200KA1A | ||||||||||||||||||||||||||||||||||
2 | 3 | 9 | 16100 | 16200 | 28.84 | 100 ppm | 100KA1A |
some individual PII (Personally Identifiable Information) available on the public forms may be redacted, original source may include additional details
This product uses the FCC Data API but is not endorsed or certified by the FCC