FCC ID: RM7DTR100REV2-1 DTR100 VHF Transmitter/Receiver

OTE DTR100 Setting-up Guide 4bs-tz000009-e Rev. 01 DTR100 VHF Transceiver for ATC applications OTE S.p.A.- Via E. Barsanti 8, 50127 Firenze, Italy 4bs-tz000009-e Issue 01 - May 2003

' OTE S.p.A. 2003 All copyright and industrial rights in this document and in the technical knowledge it contains are owned by OTE and/or the third parties rightfully concerned. No part of this document nor any data herein shall be disclosed, reproduced or used for any purpose whatsoever without the prior written consent of OTE as foreseen by the law. Drawings and specifications are subject to change. All trademarks and registered trademarks are the property of their respective holders. This document has been prepared to provide technical information on the product concerned. Whilst care has been taken in compiling the material, no responsibility can be accepted for errors or omissions in the text or in associated diagrams or tables. OTE reserves the right to change specifications, performance or features relevant to the product described without notice. Where this document is furnished in association with a quotation, tender or contract, the specifications, features, performance and availability dates which are relevant to such quotation, tender or contract shall be those specified in the schedule(s), specification(s), statement(s) of compliance or other documents specifically prepared for such purpose and shall not be assumed to be those stated or implied within this document. b 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Information for the guide user:

Before using the equipment, read all of the instructions contained in the manual and read those relative to safety with special care. Lue kyttohjeet ja erityisesti turvallisuuteen liittyvat ohjeet ennen laitteen kytt. Alvorens over te gaan tot het gebruik van het apparaat lees met aandacht al de instructies van het handboek en let vooral op die die de veiligheid betreffen. Alvorens het apparaat in gebruik te nemen lees alle instructies van het handboek en vooral de voorschriften betreffende de veiligheid. Avant toute utilisation de lappareil, lire toutes les indications contenues dans le Manuel et avec une attention particulire celles relatives la scurit. Ls alla instruktioner i denna manual innan ni anvnder apparaten och d srskilt noggrannt de anvisningar som gller skerheten. Ls alle de vejledninger, der er indeholdt i manualen med srlig opmrksomhed p de vejledninger, der vedrrer sikkerheden, fr apparatet tages i brug. Vor Gebrauch des Gerts alle in dieser Bedienungsanleitung enthaltenen Anweisungen und Vorschriften lesen. Den Sicherheitsbestimmungen ist dabei besondere Aufmerksamkeit zu widmen.

. Prima di utilizzare lapparecchiatura leggere tutte le indicazioni contenute nel manuale e con particolare attenzione quelle relative alla sicurezza. 4bs-tz000009-e Issue 01 May 2003 c 4bs-tz000009-e Issue 01 - May 2003 Antes de utilizar el equipo leer todas las instrucciones contenidas en el manual, poniendo particular atencin a las de seguridad. Antes de utilizar o aparelho, leia todas as instrues que constam no manual e com muita ateno as instrues relativas segurana. 4bs-tz000009-e Issue 01 - May 2003 d 4bs-tz000009-e Issue 01 - May 2003 Table of contents 1. GENERAL .......................................................................................... 3 1.1 PURPOSE OF THIS GUIDE............................................................................. 4 1.2 INTRODUCTION............................................................................................ 4 1.3 DECLARATION OF CE MARK CONFORMANCE ............................................... 5 1.4 ECO-COMPATIBILITY ................................................................................... 5 1.5 GUIDE ORGANISATION ................................................................................ 5 1.6 GLOSSARY OF ACRONYMS ........................................................................... 6 2. SAFETY ........................................................................................... 11 2.1 SAFETY RECOMMENDATIONS .................................................................... 11 2.2 ESD ............................................................................................................. 15 2.2.1 ESD precautions.........................................................................................................15 3. OPERATION .................................................................................... 19 3.1 OPERATING STATES AND EQUIPMENT ACCESS POINTS............................ 19 3.2 DTR100 CONTROL, INDICATORS AND CONNECTORS................................ 20 3.2.1 DTR100 front panel connectors..................................................................................22 3.2.2 DTR100 controls and indicators description...............................................................23 3.2.3 DTR100 Control Panel operating ...............................................................................25 3.2.3.1 About Baseline........................................................................................................31 3.2.4 DTR100 measurements environment.........................................................................31 3.3 FREQUENCY INPUT AND DISPLAY FORMATS............................................. 32 3.4 START-UP PROCEDURE .............................................................................. 33 4. SETTING-UP ................................................................................... 37 4.1 INTERFACE CONNECTORS.......................................................................... 37 4.1.1 Signal and data...........................................................................................................37 4.1.2 Power and grounding..................................................................................................41 4.1.3 Radio frequency..........................................................................................................42 4.2 SETTINGS AND ADJUSTMENTS................................................................... 43 4.2.1 E&M line interface settings .........................................................................................43 4.2.2 Equipment adjustments ..............................................................................................46 4.2.2.1 Reference oscillator monitoring..............................................................................47 4bs-tz000009-e Issue 01 May 2003 e 4bs-tz000009-e Issue 01 - May 2003 List of figures Figure 1.1 - DTR100 equipment .................................................................................................... 3 Figure 3.1 - DTR100 devices....................................................................................................... 20 Figure 3.2 - DTR100 keyboard menu functional block diagram.................................................. 26 Figure 3.3 - DTR100 setting environment functional block diagram ........................................... 27 Figure 4.1 - Signal and data connections .................................................................................... 37 Figure 4.2 - Power and grounding connections........................................................................... 41 Figure 4.3 - DTR100 radio frequency connections...................................................................... 42 Figure 4.4 - ALB-M dip-switch bank position............................................................................... 43 Figure 4.5 - E line circuit layout ................................................................................................... 44 Figure 4.6 - M line circuit layout................................................................................................... 45 List of tables Table 3.1 - DTR100 front side devices description...................................................................... 21 Table 3.2 - DTR100 rear side devices description ...................................................................... 21 Table 3.3 - DTR100 Headset/Microphone connector pin function .............................................. 22 Table 3.4 - DTR100 Test Interface connector pin function.......................................................... 23 Table 3.5 - PS module front panel LEDs layout and meaning .................................................... 23 Table 3.6 - TX/PA module front panel LEDs layout and meaning............................................... 23 Table 3.7 - RX module front panel LEDs layout and meaning .................................................... 24 Table 3.8 - BB module front panel LEDs layout and meaning .................................................... 24 Table 3.9 - CP module front panel layout and keyboard meaning .............................................. 24 Table 3.10 - DTR100 display messages ..................................................................................... 28 Table 3.11 - DTR100 parameters editing .................................................................................... 29 Table 3.12 - DTR100 editable parameters .................................................................................. 30 Table 3.13 - Baseline format ....................................................................................................... 31 Table 3.14 - Frequency input and display formats ...................................................................... 32 Table 4.1 - TELCO connector pin function for DTR100 .............................................................. 38 Table 4.2 - DIAG connector pin function ..................................................................................... 38 Table 4.3 - DATA connector pin function..................................................................................... 38 Table 4.4 - CTRL connector pin function..................................................................................... 39 Table 4.5 - ANT connector pin function....................................................................................... 39 Table 4.6 - GPS I/F connector pin function ................................................................................. 39 Table 4.7 - EXT CLOCK connector pin function.......................................................................... 40 Table 4.8 - Service port pin function............................................................................................ 40 Table 4.9 - E line settings #1 ....................................................................................................... 44 Table 4.10 - E line settings #2 ..................................................................................................... 44 Table 4.11 - Setting-up procedure for DTR100 ........................................................................... 46 Table 4.12 - Reference oscillator monitoring procedure ............................................................. 47 f 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Title:

Document code:

Date May 2003 Document history OTE DTR100 Setting-up Guide 4bs-tz000009-e Variations First Issue. Rev. 01 4bs-tz000009-e Issue 01 May 2003 g 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK h 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 1 - GENERAL 4bs-tz000009-e Issue 01 May 2003 1 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 2 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 1. GENERAL This section introduces the DTR100 equipment and the guide itself, by describing their tasks, operating modes and scenarios. The following figure shows the DTR100 layout. Figure 1.1 - DTR100 equipment 4bs-tz000009-e Issue 01 May 2003 3 4bs-tz000009-e Issue 01 - May 2003 1.1 PURPOSE OF THIS GUIDE The purpose of this guide is to provide to operators and technical staff the necessary knowledge of the equipment operating, in order to make possible setting-up activity. Guide user is supposed to have a good skill in telecommunications and RF basics, to understand the given terms and parameters. Only trained and qualified personnel may operate the equipment. Non-observance of these conditions and the safety instructions can result in personnel injury or in property damage. INTRODUCTION 1.2 The DTR100 multimode VHF transceiver is a state-of the-art communication unit, specifically designed to operate as radio core part of Air Traffic Control ground stations. It may be regarded as an integrated transmitter and receiver device, since the internal transmit and receive sections operate independently. Thanks to its DSP-based architecture, software-radio approach, and modular design, it allows for easy update and re-configuration. The equipment has been designed to fulfil operating requirements in any possible system layout. In the transmitter section, the equipment has outstanding performances in terms of noise radiation and unwanted emissions. These features, together with the high grade of immunity to external interference of the receiver section, allow for meeting considerable co-siting requirements under EMC-critical equipment arrangement. DTR100 belongs to the latest OTEs ATC third-generation communication systems family, together with the DR100 (VHF receiver), and DT100 (VHF transmitter). 4 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 1.3 DECLARATION OF CE MARK CONFORMANCE The equipment described in this guide has been designed according the following international standards:

Safety:

CEI EN 60950 (4th edition - 2000) - Safety of information technology equipment. CEI EN 60215 (1997-10) - Safety requirements for radio transmitting equipment. EMC:

ETSI 301 489-1 (version 1.4.1 - 2002) - Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic compatibility (EMC) standard for radio equipment and services; Part 1: Common technical requirements. ETSI 301 489-22 (version 1.2.1 - 2002) - Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 22: Specific conditions for ground based VHF aeronautical mobile and fixed radio equipment. Any connected device has to comply with the applicable safety standards. In addition, all installation activities must be performed in such a way to not compromise or lower the equipment degree safety; this must also be taken in account whenever designing system architecture and choosing installation arrangement. 1.4 ECO-COMPATIBILITY The equipment described in this guide has been designed and realized by following criteria of eco-compatibility, which are also applied to the manufacturing process. 1.5 GUIDE ORGANISATION This guide is organized into following sections:

Section 1 General. Introduces the equipment. Section 2 Safety. This section gives to operator all necessary information for a correct and safe use of the equipment. Section 3 Operation. This section describes all the aspects related to the normal use of equipment, e.g. showing function of each of the front panels controls and indicators. Section 4 Setting-up. This section gives an overview of the DTR100 interfaces and describes step-by-step the procedures for the configuration and adjustments of the equipment. 4bs-tz000009-e Issue 01 May 2003 5 1.6 GLOSSARY OF ACRONYMS ACRONYM MEANING 4bs-tz000009-e Issue 01 - May 2003 AC AF ALB-M AM-DSB ATC AWG BB BNC CE CEI CEI-EN CP CW DC DIN DR100 DSP DT100 DTR100 EMC EMI EN ERM ESD ETS ETSI GND GNSS GPS HMI IEC IMC LCD Alternate Current Audio Frequency Analogue Line Barrier Minimal Amplitude Modulation _ Double Side Band Air Traffic Control American Wire Gauge Baseband Bayonet Navy Connector (type of RF connector) Conformit Europene / Certified Europe Comitato Elettrotecnico Internazionale CEI-European Norm Control Panel Continuous Wave Direct Current Deutsches Institut fr Normung Digital Receiver, OTE 100 series Digital Signal Processing/Processor Digital Transmitter, OTE 100 series Digital Transceiver, OTE 100 series ElectroMagnetic Compliance ElectroMagnetic Interference European Norm Electromagnetic compatibility and Radio spectrum Matters ElectroStatic Discharge European Telecommunications Standard European Telecommunications Standards Institute Ground Global Navigation Satellite System Global Positioning System/Satellite Human-Machine Interface International Electrotechnical Committee/Commission Interface and Management Card Liquid Crystal Display 6 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 ACRONYM MEANING LED N NC NO O&M OTE PA ppm PS PTT RCB RF RSSI RX SMA SQL TCXO TRX TTL TX UTC VCSS VHF VOLMET VSWR wrt Light Emitting Diode Navy (type of RF connector) Normally Close Normally Open Operation and Maintenance Officine Toscane Elettromeccaniche Power Amplifier Part Per Million Power Supply (module) Push to Talk Radio Control Bus Radio Frequency Received Signal Strength Indicator Receiver or Reception Sub-Miniature A (type of RF connector) Squelch (signaling) Temperature-Compensated Crystal Oscillator Transceiver Transistor - Transistor Logic Transmitter or Transmission Universal Time Coordinated Voice Communication Switching System Very High Frequency Aviation Weather Broadcasts Voltage Standing Wave Ratio with respect to 4bs-tz000009-e Issue 01 May 2003 7 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 8 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 2 - SAFETY 4bs-tz000009-e Issue 01 May 2003 9 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 10 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 2. SAFETY This section of the guide gives all the instructions and warning for a correct and safe use of the equipment. Operators are strongly recommended to respect given indications; non-observance of these instructions can result in personnel injury or in property damage. 2.1 SAFETY RECOMMENDATIONS Carefully read all the following cautions and warnings before using the equipment. Do not use the equipment for uses different than those indicated in the guide. For correct use of equipment, refer to the relevant section within this guide. Protect the equipment from rainfalls, sprinkling of water and/or other liquids, and from dust. Do not set any object on equipment. Connect the equipment to the equipment room ground bar through dedicated connection, and not through physical contact with other frames. Do not use the equipment if it is not appropriately grounded or if ground is absent. WARNING WARNING WARNING WARNING WARNING WARNING 4bs-tz000009-e Issue 01 May 2003 11 4bs-tz000009-e Issue 01 - May 2003 The electric shock can cause the interruption of the natural breathing. An immediate action is necessary in order to restore breathing. It is therefore necessary that the staff be familiarized with the various methods of artificial breathing and cardiac massage. In case of incidents, caused from high tension, an urgent medical aid is necessary to deal the possible effects of the body poisoning caused from burns. In all the cases, proper medical assistance must be requested. It is necessary to make sure that any person who uses or takes care itself of the maintenance of the equipment having parts under dangerous voltages is able of performing artificial breathing, and it is necessary to instruct the staff on first aid measures in case the need arises. Do not use the equipment if the power cable and/or the power supply outlet are damaged. Do not use the equipment if antenna, and/or antenna cable is damaged. Install the equipment following the instructions given in this guide. The equipment must be installed in such a way complies with the national regulations in effect. Wear protection gloves when handling the equipment. When handling the equipment be sure that all internal modules and cards are safely screwed in their position into the chassis. The equipment weight can cause problems during its handling. Take the necessary precautions, e.g. be assisted by another person if necessary. Position the equipment in such a way as to guarantee its correct aeration as well as safe accessibility to the front side controls, and rear side power supply outlets, RF, signal and data connections. WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING 12 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Do not position the equipment standing on its rear side, since this can damage rear panel parts. WARNING WARNING WARNING WARNING WARNING WARNING WARNING Carry out the maintenance interventions on the equipment following the instructions given in this guide. Follow all accident prevention standards when carrying out maintenance interventions on the equipment. The equipment includes components containing beryllium oxide (beryllia), substance that can be highly toxic if no precautionary measures are undertaken. Pay attention to the beryllium oxide warning label placed on the relevant module(s), and to beryllium oxide warning within this guide. Relevant module(s) cover must not be removed. Disconnect interventions on the equipment. the power supply before carrying out maintenance The PS module does not fully disconnect the equipment from both AC and DC sources, even when front side switches are in OFF position. Part replacement must take place only once that the external AC breaker has been switched OFF, and/or external DC supply has been disconnected. Use only accessories or replacement parts approved by the manufacturer for the equipment. 4bs-tz000009-e Issue 01 May 2003 13 Only authorized interventions on the equipment. technical personnel may carry out maintenance 4bs-tz000009-e Issue 01 - May 2003 WARNING OTE S.p.A. VIA BARSANTI, 8 50127 FIRENZE ITALY TELEPHONE HELP DESK (Italy only) HELP DESK (International) FAX TELEX E-MAIL

+39 05532811 800 509590

+39 055328142

+39 0554381232

+39 570276 helpdesk.mobile@marconiselenia.com The equipment complies with all product specification and the greatest care is taken by the manufacturer so that user safety, as far as the effects of electromagnetic waves on health are concerned, is guaranteed within the limits established by the international specifications. 14 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 2.2 ESD No ESD precautions have to be taken by the operator in the daily use of the equipment. The equipment is designed and manufactured in such a way to not be sensible to electrostatic discharges. ESD precautions 2.2.1 The equipment includes many electrostatic-sensitive parts that must be handled at a static-

safeguarded working area. Furthermore, they must be arranged in static-safeguarded packages, either in the case of storing, or in the case of shipment. These recommendations should be followed with the maximum care, especially in the case of modules or board extraction and handling. A static safeguard area may be intended as:

Grounded static dissipating wrist-strap that drains static charge from the operator wearing it. A work surface covered with or composed of a grounded, static-dissipating material that drains electrical charges from devices placed on the surface. Work surface should provide a standard-size ESD-safeguard snap suitable for snap-stacking wrist-strap connection. It should be used as a convenient ESD caution, whenever handling modules and boards. These recommendations are to be extended also to activity not strictly performed in close equipment surrounding. If removed, replaced, or located inside workshop, any board should be handled by means of convenient ESD cautions. WARNING Please note that OTE disclaims any responsibility for problems due to poor ESD protection during activity. 4bs-tz000009-e Issue 01 May 2003 15 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 16 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 3 - OPERATION 4bs-tz000009-e Issue 01 May 2003 17 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 18 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 3. OPERATION The purpose of this section is to describe the operational management of the DTR100, specifically control and indicator devices and operating through the control panel facilities 3.1 OPERATING STATES AND EQUIPMENT ACCESS POINTS The equipment can be set in two different operating states:

ON Line state if the AF line port, located onto the ALB-M rear panel, is used to manage the AF+signaling connection, e.g. carrying PTT input and the TX and RX balanced audio lines. OFF Line state if the Headset/Microphone connector, located onto the Control Panel front side, is used to manage the AF+signaling connection, e.g. carrying PTT input and the TX and RX audio. In this operating state, the AF line port located onto the ALB-M rear panel is not enabled, this meaning that the equipment can not provide service to an operator located at a remote position. Although full management of equipment audio facility is possible in OFF Line state (e.g. by Headset), this is the typical operating state to be used for activities performed locally. Concerning O&M functions, the equipment can be managed from the Control Panel (CP) by using the keyboard. It is intended as an easy and immediate access point. When performing O&M tasks, it is important to note that all equipment functional parameters can be accessed only in OFF Line state. See next chapters for further details about editable parameters. 4bs-tz000009-e Issue 01 May 2003 19 4bs-tz000009-e Issue 01 - May 2003 3.2 DTR100 CONTROL, INDICATORS AND CONNECTORS Control and indicator devices are located on the front panel of the equipment. The rear panel is devoted to external signal and power connections, with the exception of indication of signaling from remote. Here below the figure shows the DTR100 front and rear view and the table gives a description of all DTR100 indicators, switches and connectors. Figure 3.1 - DTR100 devices 20 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Table 3.1 - DTR100 front side devices description Description LEDs (green, red) LEDs (green, red) LEDs (green, red) LEDs (green, red, yellow) LCD Display 2x10 digits Switch Switch Mini-DIN 8-pin connector RP17 Four control keys Function PS module status TX/PA module status RX module status BB module status Display on Control Panel ON/OFF AC switch ON/OFF DC switch Test connector. Headset/Microphone connector. Keyboard on Control Panel Table 3.2 - DTR100 rear side devices description Description LEDs (green) RJ45 connector (keyed) RJ45 connector (DATA) RJ45 connector (CTRL) RJ45 connector (DIAG) RJ45 connector (ANT) 9-pin D-type female SMA-type female connector 9-pin D-type male SMA-type female connector SMA-type female connector a: SMA-type female connector b: N-type female connector c: SMA-type female connector N-type female connector 6.3 A fuse (slow blow). Standard IEC 320 connector 20 A fuse (fast acting). GND connection point Function PTT and Squelch status indication AF line and signaling Data interface (RS232) connector Auxiliary control signals I/O connector Remote diagnostic interface connector Ext. antenna switch interface connector Service port External frequency reference input GPS/GNSS input RX module RF input Low sensitivity RX module RF input High sensitivity Connections of internal RF switch RF output VAC protection AC powering VDC protection Equipment grounding Ref 1 2 3 4 5 6 7 8 9 10 Ref 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 4bs-tz000009-e Issue 01 May 2003 21 4bs-tz000009-e Issue 01 - May 2003 Ref 28 Description Function Plug-in connector DC powering 3.2.1 DTR100 front panel connectors Headset/Microphone connector. It is a RP17 12-pin socket; it is located on the front side of Control Panel module and it is used to connect the headset by AF input/output lines and command signal (PTT and EAR_ON). Table 3.3 - DTR100 Headset/Microphone connector pin function Signal Function Ground PTT command (active with low level) Ground Ground MIC AF - VDC Microphone input1 GND PTT GND GND N.C. N.C. Earphone left GND Earphone right Earphone output (stereo earphone, 32 Ohm impedance) Earphone ON N.C. Earphone output (stereo earphone, 32 Ohm impedance) Ground Speaker muting, when the headset is connected Pin 1 2 3 4 5 6 7 8 9 10 11 12 1 Electrete microphone with 2 KOhm nominal impedance, also brings +2.5 VDC. 22 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Test connector. It is a Mini-DIN 8-pin socket; it is located on the Baseband module front panel and it is used for Global Test Interface. Table 3.4 - DTR100 Test Interface connector pin function Signal Function Ground GND TEST_SER_RX RS232 RX line, used for test purpose 10 MHz_monitor Reference clock accuracy monitoring2 GND TEST_SER_TX GND N.C. N.C. Ground RS232 TX line, used for test purpose Ground Pin 1 2 3 4 5 6 7 8 3.2.2 DTR100 controls and indicators description The PS module front panel hosts the following controls and indicators:

Table 3.5 - PS module front panel LEDs layout and meaning LED Green Red Switch DC Power AC Power Status ON OFF ON OFF Status ON OFF ON OFF Function TRX ON, operating correctly TRX OFF PS alarm Operating correctly Function Switches the TRX unit ON Switches the TRX unit OFF Switches the TRX unit ON Switches the TRX unit OFF WARNING The PS module does not fully disconnect the equipment from both AC and DC sources, even when front side switches are in OFF position. PS module should be removed from the equipment only once that the external breaker has been switched OFF, or external DC supply has been disconnected. The TX/PA module front panel hosts the following controls and indicators:

Table 3.6 - TX/PA module front panel LEDs layout and meaning LED Green Red Status ON OFF ON OFF Function TX/PA carrier ON TX/PA OFF TX/PA Fault Operating correctly 2 This is a 500 KHz signal obtained by dividing the internal 10 MHz reference source. 4bs-tz000009-e Issue 01 May 2003 23 4bs-tz000009-e Issue 01 - May 2003 The RX module front panel hosts the following controls and indicators:

Table 3.7 - RX module front panel LEDs layout and meaning LED Green Red Status ON OFF ON OFF Function RX carrier over squelch threshold RX in squelch state RX fault Operating correctly The BB module front panel hosts the following controls and indicators:

Table 3.8 - BB module front panel LEDs layout and meaning LED Green Red Yellow Status ON OFF ON OFF ON OFF Function Connected to AF line 3 Not connected to AF line BB fault Operating correctly Equipment OFF-LINE Equipment ON-LINE The CP module front panel hosts the following controls and indicators:

Table 3.9 - CP module front panel layout and keyboard meaning Key C OK Function cancel move up move down confirm 3 The BB ACTIVE LED ON indicates whether the equipment is connected and managed by the AF line (e.g it becomes OFF if the unit is set OFF-Line). 24 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 3.2.3 DTR100 Control Panel operating The display allows monitoring and management of DTR100 configuration parameters (e.g. frequency, power output level etc.) through keyboard use. Moreover, it shows the alarms

(intended as messages indicating a detected failure) coming from DTR100 modules. Following figure shows an example of messages that can be visualized on the display, and the keys use to browse windows. 4bs-tz000009-e Issue 01 May 2003 25 4bs-tz000009-e Issue 01 - May 2003 Figure 3.2 - DTR100 keyboard menu functional block diagram 26 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Figure 3.3 - DTR100 setting environment functional block diagram 4bs-tz000009-e Issue 01 May 2003 27 The following table shows information that can be monitored on display. Press or key to browse the windows. 4bs-tz000009-e Issue 01 - May 2003 Table 3.10 - DTR100 display messages Display message DTR100 Alarms Present AM 25 KHz R. F=118.000 C=000 Squelch Thr.

-107 dBm RF Output Pwr. 47.0 dBm Mod. Depth 90%

AF Line IN

-10.0 dBm AF Line OUT

-10.0 dBm TCXO Value 105 DTR100 FAULT:

T R B A I P DTR100 State:

ON LINE RS485 Addr 2 Squelch ENABLED Offset Type: 0 Offset Index: 0 Activate Measure Baseline 005.003.002.000 RACK TYPE

...Stand Alone Description This is the default window when alarms are present. Default window when no alarms are present. It gives information on current frequency, channel and the indication of OFF Line (L) or ON Line (R) state. Indication of squelch threshold level, set by operator. Power output level expressed in dBm Modulation index expressed in percentage. AF input level to get rated modulation index AF output level Indication of the fine-tuning of 10 MHz local frequency reference expressed in steps. This window appears only when alarms are present. Letters are referred to modules (or cards) that produce an alarm. This window appears only when no alarms are present. This is the address ID on the RS485 connection routed towards an external controller for remote O&M management Indication of squelch state (enabled/disabled) Indication of carrier offset scheme This windows allows activating the measurement environment Indication of the Baseline (global software release) of the equipment Indication of the equipment assigned type; this may be Main or Standby (2 equipment in redundancy scheme) or Stand Alone (single equipment) 28 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Keyboard use allows handling DTR100 configuration parameters. Instructions for handling are given in following table where an example for setting operating mode is shown. Table 3.11 - DTR100 parameters editing Action Default display

(browse or key to get it) Press OK key Press OK key Select password, pressing keys Press or key to get the desired function

(see editable parameter table) Press OK key Press or key until that it is set the desired operating mode (e.g. AM 8.33) Press OK key Waiting for setting To exit, press C key. To modify others parameters repeat from action 4. 1 2 3 4 5 6 7 8 9 Display message AM 25 KHz R. F=132.000 C=000 Login to DTR100?

Password:

Password:

Set Oper. Mode?

AM 25KHz New Oper. Mode:

AM 25KHz New Oper. Mode:

AM 8.33KHz Setting. Set Oper. Mode?

AM 8.33KHz 4bs-tz000009-e Issue 01 May 2003 29 The following table lists all control parameters, detailing the possible values, the default and the step values. In addition, table specified whether the relevant parameter can be accessed in following operating states and equipment access points:

CP-OFF Line indicates the operating by Control Panel in OFF Line conditions. CP-ON Line indicates the operating by Control Panel in ON Line conditions. 4bs-tz000009-e Issue 01 - May 2003 Table 3.12 - DTR100 editable parameters Parameter Values Default Step Operating mode4 AM-DSB 25 KHz AM-DSB 8.33 KHz AM Data AM-DSB 25 KHz Frequency 118 to 136.975 MHz 118 MHz See note 5 Frequency to Channel association Any frequency onto any channel Channel Number Squelch Thr. 0 to 119 0

-107 to -44 dBm

-107 dBm Squelch Enabled/Disabled Enabled/Disabled 1 1 dB 0.5 dB 1 1 1 1 1 1 ON LINE/OFF LINE ON LINE Enabled

+47dBm 90%

105 8 8 OFF 2 48

+40 to +47 dBm 0 to 100%

0 to 255 0 to 15 0 to 15 ON/OFF UNASSIGNED to 147 0 to 255

-30 to +10 dBm

-30 to +10 dBm

-10 dBm

-10 dBm 0.5 dB 0.5 dB Output Power Modulation Depth TCXO value DTR100 State Loudsp. Vol. Headph. Vol. Loudsp. OnOff RS485 Address6 Diag 4858 AF Line IN AF Line OUT i e n L F F O P C

i e n L N O P C

4 When operating in AM-DSB 8.33 KHz mode, it is necessary to select a frequency that is compatible with 25 KHz spacing before selecting any other operating mode. Otherwise, message "setting failed" is displayed. See also relevant table and example. 5 The step is according to the operating mode; if AM-DSB 8.33 mode is selected, step is 8.33 KHz. If any other operating mode is selected, step is 25 KHz. 6 Physical ID address on the RS485 multi-drop connection for remote O&M management via DIAG port. 7 RS485 address 1 and 15 are reserved and can not be used. 8 Logical ID address on the RS485 multi-drop connection for remote O&M management via DIAG port. 30 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 3.2.3.1 About Baseline Baseline is an identification 4-fields number indicating the equipment global release. Although this parameter is factory-configured on the proper value, it may be necessary to edit it during the equipment lifetime, e.g. upon software upgrade of any of the internal module or cards. Baseline format as following example for Baseline 5.3.2.0. Table 3.13 - Baseline format Index Index 1 Index 2 Index 3 Index 4 Ref. 5 Definition Main baseline index 3 2 0 Major baseline index Minor baseline index Fix baseline index Note the identifies This number identifies the overall equipment hardware, firmware and software configuration This number the functions of equipment. Changes to this number imply major changes to the functions of the equipment. This number the equipment. Changes to this number imply minor changes to the functions of the equipment. This number identifies the fixes implemented in the equipment. functions of identifies the 3.2.4 DTR100 measurements environment The and keys allow to access to the measurements environment. The following list details the measurements that can be shown on the display. To exit from measurements environment press C key, and the default window appears on the display. Parameter Temperature VSWR RF power output Modulation depth RSSI Unit

C

Description Current temperature measured within the TX/PA module Current VSWR at the RF output9 Watts Current RF power at the RF output10 Current modulation depth applied on the radiated carrier11

dBm Current receive signal strenght indication12 9 Not active when not in transmission. 10 Not active when not in transmission. 11 Not active when not in transmission. 12 Not active in transmission. 4bs-tz000009-e Issue 01 May 2003 31 4bs-tz000009-e Issue 01 - May 2003 3.3 FREQUENCY INPUT AND DISPLAY FORMATS DTR100 can operate both 8.33 and 25 KHz frequency spacing. According to Eurocontrol specification, the following table describes the association between the frequency to be inserted (and displayed by the system), and the effective operating frequency that is set on the equipment. Table 3.14 - Frequency input and display formats Spacing (KHz) Frequency (MHz) 25 8.33 8.33 25 8.33 8.33 25 8.33 8.33 25 8.33 8.33 25 132.0000 132.0083 132.0167 132.0250 132.0333 132.0417 132.0500 132.0583 132.0667 132.0750 132.0833 132.0917 132.1000 25 KHz mode format 132.000

132.025 132.050 132.075 132.100 8.33 KHz mode format 132.005 132.010 132.015 132.030 132.035 132.040 132.055 132.060 132.065 132.080 132.085 132.090 132.105 32 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 3.4 START-UP PROCEDURE If the equipment is powered only by AC, please refer to the following steps. Set ON the external AC breaker or AC power source. Set ON the AC switch on PS module. Wait until the equipment booting is completed, and the display shows the default window, with operating mode, frequency, etc. If no alarm is present, operate the equipment. If the equipment is powered by both AC and backup DC, please refer to the following steps. Set ON the external AC breaker or AC power source. Set ON the external DC breaker or DC power source. Set ON the AC switch on PS module. Set ON the DC switch on PS module. Wait until the equipment booting is completed, and the display shows the default window, with operating mode, frequency, etc. If no alarm is present, operate the equipment. Please note that the equipment is not serviceable until the start-up phase is completed. WARNING Do not turn OFF the AC switch when the equipment is operating with both AC and backup DC. The equipment is designed to be powered with DC only for backup purposes. In case of AC source lack, the PS module is automatically supplied by the backup DC power source, and equipment reduces the RF power output to + 46 dBm (approx. 40 W CW) max. To power-down the equipment (if powered by both AC and backup DC), operator must before set OFF the DC and AC switch, and then set OFF the DC and AC breakers or power sources. It is important to note that any maintenance action on the equipment must be done only after switching OFF the external AC and DC breakers. WARNING The PS module does not fully disconnect the equipment from both AC and DC sources, even when front side switches are in OFF position. Internal modules and/or parts should be removed from the equipment only once that the external AC and DC breakers have been switched OFF, and/or external supply sources have been disconnected. 4bs-tz000009-e Issue 01 May 2003 33 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 34 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 4 - SETTING-UP 4bs-tz000009-e Issue 01 May 2003 35 4bs-tz000009-e Issue 01 - May 2003 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 36 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 4. SETTING-UP The purpose of this section is to provide to technical staff information and references required for the setting-up of the equipment. The procedure to set-up and align the equipment is given. WARNING Setting-up are intended to be carried out by qualified technical personnel only. INTERFACE CONNECTORS 4.1 The interface connectors are located on the equipment rear side. Following chapters details pin function of each connector. Signal and data 4.1.1 Signal and data connections are located on the rear left side of the equipment as shown in the following figure. Figure 4.1 - Signal and data connections 4bs-tz000009-e Issue 01 May 2003 37 4bs-tz000009-e Issue 01 - May 2003 TELCO connector. This is a 8-pin RJ45 keyed socket, used to connect the AF input/output lines together with PTT and squelch signaling. AF input and output circuits are designed to interface balanced lines, with 600 ohm nominal impedance. The LED indicators may be used as monitoring of E&M signaling activity. Table 4.1 - TELCO connector pin function for DTR100 Pin 1 2 3 4 5 6 7 8 Function (AM-DSB) Signal Squelch signaling to external M-

M+

Squelch signaling to external AF RX + RX AF balanced audio output RX AF balanced audio output AF RX -

TX AF balanced audio input AF TX +

TX AF balanced audio input AF TX -

PTT signaling from external E+

E-

PTT signaling from external Function (AM-DATA) Squelch signaling to ACARS modem Squelch signaling to ACARS modem FSK output to ACARS modem FSK output to ACARS modem FSK input from ACARS modem FSK input from ACARS modem PTT command from ACARS modem PTT command from ACARS modem DIAG connector. This is a 8-pin RJ45 socket, used to connect the RS485 serial data line towards local controller devices. Table 4.2 - DIAG connector pin function Pin 1 2 3 4 5 6 7 8 Signal N.C. N.C. GND RS485 +

RS485 -

GND N.C. N.C. Function Ground RS485 O&M data to/from external controller RS485 O&M data to/from external controller Ground DATA connector. This 8-pin RJ45 socket allows data link between main and standby unit to support changeover features. Pin 1 2 3 4 5 6 7 8 Signal GND RS232 TX GND RS232 RX GND RTS GND CTS Table 4.3 - DATA connector pin function Function (AM-DSB) Function (AM-DATA) Ground RS232 TX data to controller Ground Ground RS232 TX data to other DTR Ground RS232 RX data from other DTR RS232 RX data from controller Ground RTS signal to other DTR Ground CTS signal from other DTR Ground RTS signal to controller Ground CTS signal from controller 38 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 CTRL connector. This is a 8-pin RJ45 socket, used for additional input and output controls and for the summary alarm output. All the input/output signals are handled by optocouplers. Table 4.4 - CTRL connector pin function Pin 1 2 3 4 5 6 7 8 Signal N.C. PTT_resp PTT_resp_ref Mute_IN Mute_IN_ref Alarm Alarm_ref N.C. Function PTT activation response output (command wire) PTT activation response output (return wire) Receiver muting command input (command wire) Receiver muting command input (return wire) Summary alarm status output (command wire) Summary alarm status output (return wire) ANT connector. This is a 8-pin RJ45 socket, used to drive an external device for RF coaxial switch handling. Output signal is handled by optocoupler. Table 4.5 - ANT connector pin function Function External RF switch drive (command wire) External RF switch drive (return wire) Pin 1 2 3 4 5 6 7 8 Signal N.C. N.C. N.C. SW_ANT SW_ANT_ref N.C. N.C. N.C. GPS I/F connector. This is a D-type 9-pin male, used for interfacing an external GPS/GNSS device to get UTC absolute time reference in VDL modes13. Table 4.6 - GPS I/F connector pin function Pin 1 2 3 4 5 6 7 8 9 Signal 1 pps GND N.C. RS232 TX RS232 RX GND N.C. N.C. GND Function 1 pps reference pulse from external GPS/GNSS (TTL) Ground RS232 TX data to external GPS/GNSS RS232 RX data from external GPS/GNSS Ground Ground 13 Not available in current release. 4bs-tz000009-e Issue 01 May 2003 39 EXT CLOCK input. This is a SMA-type coaxial female, used to get TTL square-wave 10 MHz high-precision clock signal from an external reference, such as high-stability TCXO, or GPS-

slaved reference, etc. It allows for increasing the rated frequency accuracy of the equipment up to the reference one. 4bs-tz000009-e Issue 01 - May 2003 Table 4.7 - EXT CLOCK connector pin function Pin Signal Center Clock Shield GND Function 10 MHz reference (TTL) Shield Service port. This is a D-type 9-pin female, used for service tasks and audio recording14. Pin 1 2 3 4 5 6 7 8 9 Signal

+13.5 VDC RS485 -

RS485 +

REC OUT -

REC OUT +

N.C. N.C. LDSPK +

LDSPK -

Table 4.8 - Service port pin function Function

+13.5 VDC from PS module15 Extension of RCB bus (service purposes only) Extension of RCB bus (service purposes only) Recording balanced audio output Recording balanced audio output For connection of external loudspeaker16 For connection of external loudspeaker17 14 600 ohm balanced line carrying both TX and RX audio, having an output of -10 dBm 3 dB. 15 Max. current output 500 mA. This output must be used only to power external accessories recommended by OTE, not suitable to power third-part external devices. 16 Option not available in current release. 17 Option not available in current release. 40 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Power and grounding 4.1.2 Power and grounding connections are located on the rear right side of the equipment as shown in the following figure. Figure 4.2 - Power and grounding connections VDC plug-in. This is the DC supply input connection point, to be used with crimped-plug wires. AC main. This is an IEC 320 standard socket for AC powering, provided with fuse receptacle. Use only CE-approved power cord. GND (screw). This is a M3 screw terminal point for connection of grounding cable, located on the rear side of the equipment motherboard. WARNING The use of a CE-approved power cord is mandatory. 4bs-tz000009-e Issue 01 May 2003 41 Radio frequency 4.1.3 Radio frequency connections are located on the middle rear side of the equipment as shown in the following figure. 4bs-tz000009-e Issue 01 - May 2003 Figure 4.3 - DTR100 radio frequency connections RX Low sensitivity input (SMA-female). By this port, the receiver is fed by the normal input, having equipment rated sensitivity features. RX High sensitivity input (SMA-female). By this port, the receiver is fed by the high-sensitivity input, but it is important to note that this connection bypasses the first RX front-end cell, thus having less protection wrt interfering signals, e.g. radiated carrier from co-located transmitters. This input must be used only when the receiver is connected to an external band-pass filter (e.g. cavity filter). TX/PA output (N-female). This port is the TX/PA direct radio frequency output. RF switch connectors. The internal RF switch has a normally-closed SMA port (to be used for the receiver section, by fitting the external coaxial SMA-SMA jumper), and a normally-open SMA port (to be used for the transmitter section, by fitting the external coaxial SMA-N jumper). The switch common port is then available on an N-female port, to be connected to the radiating system (or the filtering device, etc). By using this layout the equipment fully operates as "transceiver", device, in which the transmitter and receive sections share the same radiating system. As factory-default (see the above figure), the equipment is provided with common TX/RX coaxial port (jumpers present), the normally-closed port is routed to the receiver low-sensitivity input. 42 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 4.2 SETTINGS AND ADJUSTMENTS Following chapters detail necessary information for proper setting-up of the equipment, by defining a step-by-step procedure. Setting-up is intended as the sequence of alignment and configuration actions that must be performed by operator in order to put the equipment in service. E&M line interface settings 4.2.1 ALB-M card feature dip-switch banks to match AF line interfacing requirements. Line interfacing adjustments concern E line and M line settings. To perform the setting, the card must be previously removed from the equipment rear side. Following figure shoes dip-switch bank position onto the card (screening cover removed). Figure 4.4 - ALB-M dip-switch bank position WARNING Please follow given indications about ESD prevention cares when handling the card. 4bs-tz000009-e Issue 01 May 2003 43 E line is used to acquire PTT signaling from TELCO line. The circuit design is based on a current detector; the line polarization can be either due to external or internal voltage, as shown in the figure. 4bs-tz000009-e Issue 01 - May 2003 Figure 4.5 - E line circuit layout In the first case, the presence of an external voltage makes the current flow in the loop; in the second configuration ALB-M powers the line and external equipment closes the loop. The proper configuration can be selected setting contacts 1 to 3 of SW01 according to the table. Table 4.9 - E line settings #1 Line feed 1 2 3 Internal voltage ON ON OFF External voltage OFF OFF ON Dip-Switch 4 X X 5 X X 6 X X 7 X X 8 X X When external voltage configuration is used, a voltage from 12 to 48 VDC can be applied to E leads. The applied polarity can be positive or negative. Contacts 5 to 8 of SW01 must be set according to external applied voltage value as from configuration given in table below. Table 4.10 - E line settings #2 Dip-Switch Line feed 12V (9V to 18V) 12V (220 Ohm) 12V (0 Ohm) 24V (18V to 36V) 48V (36V to 60V) 1 X X X X X 2 X X X X X 3 X X X X X 8 7 5 ON ON ON 6 4 X OFF OFF X ON OFF X X X ON ON X X OFF ON OFF OFF X OFF OFF OFF OFF 44 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 When internal voltage configuration is used, the voltage applied is +12V. Dip-switches 5 and 6 of SW01 are not relevant; only 7 and 8 can be set. Setting on contact 7 reduces the series resistance of about 70% (from 800 Ohm to 220 Ohm). Setting on contact 8 reduces to zero the series resistance. This setting can be useful when using long cables that have a series resistance not negligible18. M line is used to send squelch signaling towards remote device through the TELCO line. The circuit design is based on an electronic switch. The line can be interfaced in either "floating" or

"common ground" layout Figure 4.6 - M line circuit layout In the first case both leads of M line are related to voltage potentials of the external equipment, and are not referred to ALB-M potentials. In the second case, a dedicated wire for return path is not present, but the current loop is anyway closed through isolated ALB-M ground. In this configuration, isolated ALB-M ground and external equipment ground reference must be at the same potential. When activated, M line interface makes a short circuit on the loop, making current flow19. 18 This setting can be useful when using long cabling having a series resistance not negligible (e.g. a connection of 5 Km with AWG24 wire, 0.205 mm2 section, has (84Ohm/Km x 5Km) x 2 = 840 Ohm series resistance). 19 The current flow takes place independently from the line polarity. The residual voltage is 2.5 V @ 20 mA. 4bs-tz000009-e Issue 01 May 2003 45 4bs-tz000009-e Issue 01 - May 2003 Equipment adjustments 4.2.2 The following procedure lists the operating parameters (e.g. frequency, modulation depth, etc) that must be adjusted according to system layout requirements. In any case, further non-

mandatory adjustments (e.g. loudspeaker volume, earphone volume, etc) may be done according to user criteria, referring to section 3 - Operation. Any setting-up activity must be done only after than installation has been completed, thus also including the connection to any external device and the alignment of ancillary devices (filters, radiating system, etc). Setting-up is listed in following procedure. Table 4.11 - Setting-up procedure for DTR100 Step Action Expected result 1 2 3 4 5 6 7 8 9 10 11 Switch ON and wait for the end of boot. Login20. Set the equipment OFF Line21. Set the operating frequency22. Set the operating mode (e.g. AM-25 kHz or AM-8.33 kHz). Set the equipment RS485 address23. is done, control panel After correct booting, control panel displays shows the default windows. Setting environment menu is active. Once setting display shows OFF Line indication. Once setting display shows new operating frequency. Once setting display shows new operating mode. Once setting display shows new RS485 address. is done, control panel is done, control panel is done, control panel Set the equipment DIAG485 address24. Once setting is done, control panel Set the RF power output. Set the transmission timeout25. Set the maximum modulation depth26. Set the TX audio input level27. is done, control panel display shows new DIAG485 address. Once setting display new RF power level. Once setting display new transmission timeout figure. Once setting display new modulation depth figure. Once setting display new TX audio input level. is done, control panel is done, control panel is done, control panel 20 The control panel display browsing is detailed into 3 - Operation. Please refer to the relevant chapter about how getting the desired editable parameters. 21 OFF Line condition is necessary, since many parameters can not be edited when in ON Line. 22 The adjustment of the operating frequency and operating mode must be done in conjunction, refer also to 3 -

Operation for details. 23 This parameter is used to assign a specific physical ID address on the DIAG port, within the RS485 multi-drop connection to an external controller. If no controller for remote O&M activity is present, this setting is not necessary. 24 This parameter is used to assign a specific logical ID address on the DIAG port, within the RS485 multi-drop connection to an external controller. If no controller for remote O&M activity is present, this setting is not necessary. 25 Transmission timeout sets the maximum elapse of time allowed for transmission. At timeout counter expiring, transmission is shut-down. Short timeout values can affect the equipment service by truncate radiated speech. It is also possible to set the PTT Timeout OFF by setting the relevant parameter to 0, thus allowing for continuous transmission operating. Although this setting is not recommended, it can be required for special application (e.g. VOLMET, etc). 26 Setting of maximum modulation depth is anyway referred to a nominal AF input of -10 dBm. Baseband module internal process operates as compressor/limiter device, avoiding modulation rate to override 95% and causing over-

modulation phenomena. 27 It operates a gain or attenuation on the TX AF line coming from the VCSS. It must be set according to the expected nominal AF level of the line. 46 4bs-tz000009-e Issue 01 - May 2003 4bs-tz000009-e Issue 01 - May 2003 Step 12 13 14 15 Action Set the RX audio output level28. Set the squelch threshold29. Set the equipment ON Line30. Logout31. Expected result is done, control panel is done, control panel Once setting display new RX audio output level. Once setting display shows new squelch threshold. Once setting display shows ON Line indication. Quit the setting environment menu. is done, control panel It is important to note that many of the above parameters do not need to be changed from the default settings for a correct operating, and therefore some of the above steps may be ignored. In example, default value of squelch threshold is -107 dBm. This value allows for correct operating in standard operating condition, and it is not necessary to change it. 4.2.2.1 Reference oscillator monitoring This adjustment must be done with the equipment ON. The front side test port has a monitoring facility for the internal 10 MHz reference oscillator that has a rated 1 ppm accuracy. When operating in in 25 kHz channel spacing mode 5 ppm accuracy is required; when operating in 8.33 kHz channel spacing mode 1 ppm accuracy is required. On the TEST port, a TTL-level 500 KHz square-wave signal is available, obtained by dividing the internal reference32. As specified, the counter used for the test must have an internal time base stability better than 0.1 ppm (1 x 10-7); it is recommended to use a counter provided with internal high-stability oven, or slaved to external reference (e.g GPS). It is necessary to wire a cabling having on the equipment side a Mini-DIN 8-pin male, and having on the frequency counter side the relevant termination (e.g. BNC coaxial). Cabling should be realized preferably with RF-coaxial cable. The pin 3 of the TEST port must be connected to the central conductor of coaxial, while pins 1, 4 or 6 (corresponding to GND) must be connected to the shield. Once realized the cable, the procedure for monitoring and adjustment is given in the following table. Table 4.12 - Reference oscillator monitoring procedure Step 1 2 3 Action Expected result Connect the cabling to the TEST port and to the counter input port. Set the equipment OFF Line. Enter in the display menu the setting environment, and scroll the menu until the window <Set Osc. value> is shown. Frequency counter displays the 500 KHz signal current frequency. The equipment is OFF Line. Current <Set Osc. value> setting figure is displayed. 28 It operates a gain or attenuation on the RX AF line routed to the VCSS. It must be set according to the nominal AF level expected by the line, or connected device. 29 Wrong setting of the squelch threshold may result in no receiving of weak signals. 30 ON Line is the normal operating condition. 31 Logout is mandatory for permanently storing of the edited parameters. 32 The frequency accuracy can be monitored and adjusted even by checking the effective frequency precision of the radiated carrier, e.g. by connecting a radio test set on the transmitter RF output. 4bs-tz000009-e Issue 01 May 2003 47 4 5 6 to previous step, If the equipment is operating in 25 kHz channel spacing mode, and the frequency reference is less accurate than 5 ppm wrt the 500 KHz signal, proceed adjusting the

<Set Osc. value> until the desired accuracy is achieved. the Alternatively in 8.33 kHz equipment channel spacing mode, and the frequency reference is less accurate than 1 ppm wrt the 500 KHz signal, proceed adjusting the

<Set Osc. value> until the desired accuracy is achieved. Set the equipment ON Line and disconnect the counter. is operating if 4bs-tz000009-e Issue 01 - May 2003 Frequency counter displays the 500 KHz signal adjusted frequency. Frequency counter displays the 500 KHz signal adjusted frequency. The equipment is ON Line. 48 4bs-tz000009-e Issue 01 - May 2003