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Section V MAINTENANCE
Up
TM-11-5820-670-12 Radio Set AN/ARC-131(NSN
Next
OPERATIONAL CHECK-continued


TM 11-5820-670-12
MAINTENANCE CONTROLS AND INDICATORS. (CONT)
3-11.
FUNCTION OR USE
CONTROL OR INDICATOR
KEY
Permits monitoring of voltage, automatic gain control
TEST METER
1
(age), and power functions of radio set. Scale is 0 to
100 in 10 equal divisions.
Six position rotary switch, used to connect TEST METER
TEST SWITCH
2
to various circuits of radio set to be checked.
Position 1 Connects 24-volt dc supply to TEST METER.
Position 2 Connects regulated 16-volt dc supply to
TEST METER.
Position 3 Connects agc circuits to TEST METER.
Position 4 Connects rf output circuit (RF FWD) to TEST
METER.
Position 5 Connects antenna circuit (RF REFL) to TEST
METER.
Position 6 Disconnects meter from all circuits.
Selects nominal transmitter power output. In HI
XMTR HI-LO (transmitter
3
position, power output level is 10 watts. In LO posi-
power output switch)
tion, power output level is 1 watt.
Keys transmitter without depressing microphone button
XMTR TEST (transmitter
4
or press-to-talk button. When TEST SWITCH is set to
test pushbutton)
position 3 and XMTR TEST is depressed, agc is measured
on TEST METER. When TEST SWITCH is set to position 4
and XMTR TEST is depressed, forward or rf output power
is measured. When TEST SWITCH is set to position 5 and
XMTR TEST is depressed, rf reflected by antenna circuit
is measured.
Permits adjustment of carrier squelch.
SQ ADJ (squelch
5
adjustment)
Disables squelch circuits to allow hearing of back-
SQ DIS (squelch disable
6
ground noise to adjust control unit VOL control setting.
pushbutton)
3-12.
OPERATIONAL CHECK.
The operational check provides a step by step procedure for evaluating the operational readiness of
the Radio Set AN/ARC-131. It specifies tests and checks for the receiver- transmitter, mounting, and
control unit.
The operational check is normally performed with the radio set installed in aircraft. At a minimum,
the operational check is done as part of PMCS. At the discretion of the maintenance supervisor,
the operational check could be done more often than the scheduled PMCS. After replacement or
adjustment of any component, the portion of the operational check that applies shall be repeated to
ensure that the malfunction has been corrected and that no others exist.
3-23


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