Nautel ND2000A-02x-xx0 Series, Technical Instructions

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500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 5)
15 January 2005
TABLE OF CONTENTS
(Continued)
Section Page
4 OPERATING INSTRUCTIONS (Continued)
4.7.2 SWR-ALARM INDICATION .................................................................................................. 4-3
4.7.3 REMEDIAL ACTION IN BEACON MODE............................................................................ 4-3
4.7.4 REMEDIAL ACTION IN VOICE AND BEACON MODE ...................................................... 4-3
4.8 MODULATION PERCENTAGE INDICATION .................................................................... 4-4
5 TESTING AND ADJUSTMENT
5.1 GENERAL ............................................................................................................................ 5-1
5.2 OPERATING OF EQUIPMENT............................................................................................ 5-1
5.3 TEST/ADJUSTMENT PROCEDURES................................................................................ 5-1
5.3.1 TEST/ADJUSTMENT TEST EQUIPMENT .......................................................................... 5-2
5.3.2 TEST/ADJUSTMENT PREREQUISITES............................................................................. 5-2
5.3.3 TRANSMITTER TURN-ON................................................................................................... 5-2
5.3.4 DC VOLTAGE CHECKS....................................................................................................... 5-3
5.3.4.1 B- Voltage (No Load) Check .......................................................................................... 5-3
5.3.4.2 Logic/Control DC Voltage Checks ................................................................................. 5-3
5.3.5 CARRIER FREQUENCY CHECK ........................................................................................ 5-4
5.3.5.1 RF Synthesizer Check.................................................................................................... 5-4
5.3.5.2 RF Oscillator Check........................................................................................................ 5-4
5.3.6 RF DRIVE OUTPUT LEVEL CHECK ................................................................................... 5-5
5.3.7 PULSE WIDTH MODULATION DRIVE CHECK.................................................................. 5-5
5.3.8 RF CARRIER CHECK........................................................................................................... 5-6
5.3.9 MODULATION DEPTH (MCW) CHECK.............................................................................. 5-6
5.3.10 B- VOLTAGE (MCW) CHECK .............................................................................................. 5-7
5.3.11 AUDIO LIMITER BALANCE CHECK ................................................................................... 5-7
5.3.12 MODULATION DEPTH (A3E MODE) CHECK .................................................................... 5-8
5.3.13 IDENTIFICATION CODE CHECK........................................................................................ 5-9
5.3.14 STANDBY '1' AND STANDBY '2' CODE CHECKS ............................................................. 5-9
5.3.15 FAULT THRESHOLDS/CHANGEOVER CHECK ............................................................. 5-10
5.3.15.1 Preliminary Changeover Procedures........................................................................... 5-10
5.3.15.2 Carrier Level Threshold Check .................................................................................... 5-10
5.3.15.3 Modulation Depth Fault Threshold Check ................................................................... 5-11
5.3.15.4 Changeover/Shutdown Check ..................................................................................... 5-12
5.3.16 SWR CUTBACK THRESHOLD CHECK............................................................................ 5-15
5.3.17 RF CURRENT THRESHOLD CHECK............................................................................... 5-16
5.3.18 ALARM SYSTEMS CHECK................................................................................................ 5-16
5.3.18.1 RF Current-Alarm Check.............................................................................................. 5-17
5.3.18.2 SWR-Alarm Check ....................................................................................................... 5-17
5.3.18.3 Shutdown-Alarm Check................................................................................................ 5-17
5.3.18.4 Standby-Alarm Check .................................................................................................. 5-17
5.3.18.5 Battery-Alarm Check .................................................................................................... 5-17
5.3.18.6 Mod Drive-Alarm Check ............................................................................................... 5-17
5.3.18.7 RF Drive-Alarm Check ................................................................................................. 5-18
5.3.19 LOW AC POWER CHECK ................................................................................................. 5-18
5.3.20 LOW BATTERY VOLTAGE MONITOR ............................................................................. 5-18
5.3.21 TEST/ADJUSTMENT OF SIDE B ...................................................................................... 5-19
5.4 SPECIAL ADJUSTMENT PROCEDURES ....................................................................... 5-19
5.4.1 CURRENT SHUNT RESISTOR ADJUSTMENT ............................................................... 5-19
5.4.2 TEST METER ADJUSTMENT............................................................................................ 5-20
5.4.2.1 Forward Power Reading .............................................................................................. 5-20