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500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Page
4-7
15 January 2005
Table 4-3 Modulator/Power Amplifier Module Controls and Indicators
PANEL MARKING/
REF
FIG
NOMENCLATURE
FUNCTION
DES
NO.
USED IN TEXT
*A9DS1
MD-4
B
-
Indicates the B- voltage is being applied when on.
*A9DS2
MD-4
PA VOLTS - 4
Indicates modulator *A7 is functioning and is applying
a modulated B- voltage to power amplifier *A8 when
on.
*A9DS3
MD-4
PA VOLTS - 3
Indicates modulator *A5 is functioning and is applying
a modulated B- voltage to power amplifier *A6 when
on.
*A9DS4
MD-4
PA VOLTS - 2
Indicates modulator *A3 is functioning and is applying
a modulated B- voltage to power amplifier *A4 when
on.
*A9DS5
MD-4
PA VOLTS - 1
Indicates modulator *A1 is functioning and is applying
a modulated B- voltage to power amplifier *A2 when
on.
*F1
MD-9
7A SLOW
Fuses B- voltage to modulator *A1 at 7.0 amperes.
*F2
MD-9
7A SLOW
Fuses B- voltage to modulator *A3 at 7.0 amperes.
*F3
MD-9
7A SLOW
Fuses B- voltage to modulator *A5 at 7.0 amperes.
*F4
MD-9
7A SLOW
Fuses B- voltage to modulator *A7 at 7.0 amperes.
*S1
MD-5
Thermal
Normally closed thermal switch. Opens and removes
PWM from the associated modulators when
temperature exceeds 82°C.
TP1
MD-4
PA VOLTS
Provides a test point to monitor the average output
voltage (modulated B- V dc) from the modulators.
* Denotes partial reference designation shown. For complete reference designation, prefix with A2
or A3 as appropriate.