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500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 1)
15 January 2005
TABLE OF CONTENTS
Section
Page
1 GENERAL
INFORMATION
1.1
INTRODUCTION................................................................................................................... 1-1
1.2
PURPOSE AND SCOPE OF MANUAL .............................................................................. 1-1
1.3
PURPOSE
OF
EQUIPMENT................................................................................................ 1-1
1.4
FACTORY
REPAIR SERVICE............................................................................................. 1-1
1.5
MECHANICAL
DESCRIPTION............................................................................................ 1-1
1.5.1
TRANSMITTER CHASSIS.................................................................................................... 1-1
1.6
DUPLICATED
MODULES/ASSEMBLIES .......................................................................... 1-2
1.7
TECHNICAL
SUMMARY ..................................................................................................... 1-2
1.8
SPECIAL TOOLS AND TEST EQUIPMENT....................................................................... 1-2
1.9
GLOSSARY
OF TERMS ...................................................................................................... 1-2
2
THEORY OF OPERATION
2.1
GENERAL ............................................................................................................................. 2-1
2.2
TRANSMITTER
DESCRIPTION .......................................................................................... 2-1
2.3
CONTROL/MONITOR PANEL............................................................................................. 2-1
2.3.1
LOCAL/REMOTE CONTROL............................................................................................... 2-1
2.3.2
NORMAL\BYPASS CONTROL ............................................................................................ 2-1
2.3.3
RF
CONTROL SWITCH ....................................................................................................... 2-1
2.3.4
ALARM LAMPS..................................................................................................................... 2-2
2.3.4.1
Battery-Alarm Lamp........................................................................................................ 2-2
2.3.4.2
RF
Current-Alarm Lamp................................................................................................. 2-2
2.3.4.3
SWR-Alarm Lamp........................................................................................................... 2-2
2.3.4.4
Standby-Alarm Lamp...................................................................................................... 2-2
2.3.4.5
Shutdown-Alarm Lamp................................................................................................... 2-2
2.3.5
SELECT
MAIN
TX SWITCHING .......................................................................................... 2-2
2.3.6
SWITCHED METERING....................................................................................................... 2-2
2.3.6.1
Test-Power/Mod Meter/Switch....................................................................................... 2-2
2.3.6.2
Test
Volts/Current Meter/Test Switch ............................................................................ 2-2
2.4
MODULATOR/POWER
AMPLIFIER MODULE.................................................................. 2-2
2.4.1
MODULATOR (A2A1)........................................................................................................... 2-3
2.4.2
POWER
AMPLIFIER (A2A2) ................................................................................................ 2-3
2.5
EXCITER MODULE .............................................................................................................. 2-4
2.5.1
+15
VDC REGULATOR........................................................................................................ 2-4
2.5.2
-15
VDC REGULATOR......................................................................................................... 2-4
2.5.3
KEYING/MOD SWITCH........................................................................................................ 2-4
2.5.4
POWER TRIM ....................................................................................................................... 2-4
2.5.5
KEYER
PWB (A4A1)............................................................................................................. 2-5
2.5.6
RF
OSCILLATOR PWB (A4A3)............................................................................................ 2-6
2.5.6.1
Crystal Oscillator............................................................................................................. 2-6
2.5.6.2
External RF Drive Input .................................................................................................. 2-6
2.5.7
RF
SYNTHESIZER PWB (A4A3) ......................................................................................... 2-6
2.5.8
RF DRIVE AMPLIFIER (A4A4)............................................................................................. 2-6
2.5.9
MODULATOR
DRIVER PWB (A4A2) .................................................................................. 2-6
2.5.9.1
Voice Audio Filter............................................................................................................ 2-7
2.5.9.2
Voice
Audio Amplifier/Limiter ......................................................................................... 2-7
2.5.9.3
Emission
Mode Multiplexer ............................................................................................ 2-7