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500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 2)
15 January 2005
TABLE OF CONTENTS
(Continued)
Section
Page
2
THEORY OF OPERATION
(Continued)
2.5.9.4
Line Volts Compensation/Power Trim Control .............................................................. 2-7
2.5.9.5
PWM
Square-Wave Generator...................................................................................... 2-7
2.5.9.6
Ramp Integrator.............................................................................................................. 2-7
2.5.9.7
Linear Attenuator ............................................................................................................ 2-8
2.5.9.8
Variable
Pulse-Width Generator .................................................................................... 2-8
2.5.9.10
Balanced Drive ............................................................................................................... 2-8
2.5.9.11
Pulse-Width Fault Detector ............................................................................................ 2-9
2.5.9.12
RF
Drive Alarm Circuit.................................................................................................... 2-9
2.6
POWER ON/OFF PANEL ASSEMBLY............................................................................... 2-9
2.7
POWER
SUPPLY MODULES.............................................................................................. 2-9
2.7.1
POWER SUPPLY CONTROL PWB (A7A1) ........................................................................ 2-9
2.7.2
B- VDC To +24 VOLT DC CONVERTER PWB (A7A2) .................................................... 2-11
2.7.3
AC SUPPLY MONITOR (A7A3) ASSEMBLY .................................................................... 2-11
2.8
HARMONIC
FILTER
ASSEMBLY (A9)............................................................................. 2-11
2.8.1
RF
CURRENT
PROBE (A9A1) .......................................................................................... 2-11
2.8.2
FWD/REFL
POWER PROBE (A9A2)................................................................................. 2-12
2.8.2.1
RF
MON Switching....................................................................................................... 2-12
2.9
MONITOR
PWB (A10)........................................................................................................ 2-12
2.9.1
TEST
SWITCH CONTROL................................................................................................. 2-12
2.9.2
RELAY SWITCHING........................................................................................................... 2-12
2.9.2.1
Remote On/Off Relay ................................................................................................... 2-12
2.9.2.2
A/B
Main Select ............................................................................................................ 2-13
2.9.2.3
Shutdown Relay............................................................................................................ 2-13
2.9.2.4
Standby Relay .............................................................................................................. 2-13
2.9.3
M15 VOLT DC REGULATOR ........................................................................... 2-13
2.9.4
MONITOR
-15
VOLTS DC CIRCUIT.................................................................................. 2-13
2.9.5
MOD
THRESHOLD CIRCUIT ............................................................................................ 2-13
2.9.6
CARRIER
THRESHOLD CIRCUIT .................................................................................... 2-14
2.9.7
CHANGEOVER
DELAY CIRCUIT ..................................................................................... 2-14
2.9.8
STANDBY CIRCUIT............................................................................................................ 2-14
2.9.9
SHUTDOWN CIRCUIT ....................................................................................................... 2-14
2.9.10 FORWARD
POWER CAL................................................................................................... 2-15
2.9.11 AUDIO
MONITOR CIRCUIT............................................................................................... 2-15
2.9.11.1
Speaker Control............................................................................................................ 2-15
2.9.12 RF
CURRENT CIRCUIT ..................................................................................................... 2-15
2.9.13
SWR CUTBACK THRESHOLD CIRCUIT.......................................................................... 2-15
2.9.14
POWER TRIM INTERFACE CONTROL CIRCUIT............................................................ 2-16
2.9.15 REFLECTED
POWER/REFL PWR CAL CIRCUIT ........................................................... 2-16
2.9.16 MOD%
CONTROL CIRCUIT.............................................................................................. 2-16
2.9.17
AC POWER MONITOR CIRCUIT (DC Option Installed)................................................... 2-16
2.9.18
AC POWER MONITOR CIRCUIT (DC Option Not Installed) ............................................ 2-17
2.9.19 MONITOR
BYPASS CIRCUIT............................................................................................ 2-17
2.10
BATTERY CONTROL PANEL (A11) ASSEMBLY........................................................... 2-17
2.10.1 BATTERY
CONTROL PWB (A11A1)................................................................................. 2-17
2.10.1.1
Low
Battery Voltage Monitor ........................................................................................ 2-18