Figure 3-3. UHF Control panel (AN/ARC- 164)
3 . GUARD. Selection auto-
matically tunes the main receiver and transmitter to
the guard frequency and the guard receiver is
(d.) ADF. Not used.
c. Normal Operation.
(b.) SOUELCH switch. Turns main
(1.) Turn on procedure:
receiver squelch on or off.
VOL control. adjusts volume.
(8.) TONE pushbutton. When pressed,
transmits a 1,020 Hz tone on the selected frequency.
It is presumed aircraft power is on and
normally used avionic circuit breakers
(9.) Function selector. Selects operating
(a.) OFF. Turns set off.
(b.) MAIN. Selects normal transmis-
sion with reception on main receiver.
(c.) BOTH. Selects normal transmis-
sion with reception on both the main receiver and
the guard frequency receiver.
Avionics master power switch
(overhead panel, fig. 2-12) - ON.
Function select switch (UHF con-
trol panel, fig. 3-3) -MAIN or
BOTH position, as required.