Vector-LP Radio Beacon Transmitter
Technical Instruction Manual
Feb.24.09
Contents Page
5
MAINTENANCE
AND
TROUBLESHOOTING
5.1 GENERAL
5-1
5.2 SCHEDULED
MAINTENANCE
5-1
5.3 CORRECTIVE
MAINTENANCE
5-2
5.4
ELECTROSTATIC
PROTECTION
5-2
5.5
TROUBLESHOOTING FRONT PANEL ALARMS
5-3
5.6
REPLACING AN RF POWER MODULE
5-9
5.7 FET
CHECKING/REPLACEMENT
5-11
5.8
EXCITER PANEL PWB REPLACEMENT
5-12
5.8.1
Exciter Interface PWB and Interconnecting PWB
Replacement
5-12
5.8.2
Exciter Monitor/Generator PWB Replacement
5-13
5.8.3
Interface PWB Replacement
5-14
5.9
BATTERY BOOST ASSEMBLY REPLACEMENT
5-14
6
THEORY OF OPERATION
6.1
INTRODUCTION
6-1
6.2
TRANSMITTER
OVERVIEW
6-1
6.3
AC_DC POWER STAGE
6-1
6.3.1 Interface PWB
6-5
6.3.2 Ac/Dc Universal Input Power Supplies
6-5
6.4
EXCITER
STAGE
6-6
6.4.1
Exciter Interface PWB
6-6
6.4.2 RF Synthesizer PWBs
6-6
6.4.3 Interphase PDM Driver PWBs
6-8
6.4.4 Exciter Monitor/Generator PWBs
6-15
6.5
CONTROL/MONITOR
STAGE
6-16
6.5.1
Control/Display
PWB
6-16
6.5.2
Remote Interface PWB
6-19
6.5.3
Front Panel Metering
6-20
6.5.4
NDB Site Interface PWB (Optional)
6-21
6.5.5
Modem
(Optional)
6-21
6.6
RF POWER STAGE
6-22
6.6.1
RF Power Module(s)
6-22
6.6.2 RF Filter PWB
6-29
6.6.3 RF Power Probe PWB
6-29
6.7
MODULATION DEPTH WHEN USING A HIGH ‘Q’
ANTENNA
6-30
