(b) #1. Selects COMM 1 position.
distance of approximately 50 miles. The FM liaison set
(c) #2. Selects COMM 2 position.
(d) #3. Selects UHF position.
audio output is applied to the respective audio control
(e) #4. Selects HF radio position (if
panel where it is made available to the headsets. Power
for the FM liaison set is fed through 50-ampere
AVIONICS NO. 1 and AVIONICS NO. 2 circuit breakers,
Permits the flight crew to
located on the copilot's circuit breaker panel. The unit is
address aft cabin occupants over the passenger address
protected by a 10-ampere circuit breaker, placarded FM,
located on the copilot's subpanel.
(4) Headphone audio select buttons. Selects
audio input to heard on the headphones.
a. Controls and Functions.
(1) Megahertz selector. Tunes transceiver in
d. Operating Procedures.
10-MHz, as indicated by the first digit of the frequency
AVIONICS MASTER switch - ON.
MIC SELECT switch - As required.
Audio select button - As required.
(2) Frequency indicator.
to which transceiver is tuned.
INT VOL - Adjust as required if INT is
(3) Megahertz selector. Tunes transceiver in
1-MHz, as indicated by the second digit of the frequency
3-7. FM Liaison Set (AN/ARC-131) (If installed).
The FM liaison set (fig. 3-2) is a radio transceiver
(4) Kilohertz selector. Tunes transceiver in
which provides two-way frequency modulated (FM)
100-kHz, as indicated by the third frequency indicator.
Megahertz (10) selector
Megahertz (1) selector
Kilohertz (100) selector
Kilohertz (10) selector
Figure 3-2. FM Liaison Set (AN/ARC-131)
Change 5 3-3