HEADQUARTERS OH-58A, Техническое руководство, Страница: 126 / 292

TM 55-1520-228-10
3-8.2 Change 11
PRESET A frequency is selected
using the preset channel
selector switch for select-
ing any one of 20 preset
channels as indicated on
the CHAN indicator.
GUARD The main receiver and
transmitter are automati-
cally tuned to the guard
frequency. Blocks out
any frequency set either
manually or preset.
SQUELCH ON-OFF
switch Turns squelch of main
receiver on or off.
VOL control Adjusts volume.
TONE switch Enables transmisison
and headset monitoring
of a 1.020-Hz tone on
selected frequency for
maintenance check only.
Mode selector switch Selects operating mode:
OFF Turns power off.
MAIN Enables the transceiver.
BOTH Enables transceiver and
guard receiver.
ADF Not operational.
b. RT-1167C/ARC-164(V). The controls and func-
tions of the RT-1167C/ARC-164(V) are identical to the
RT-1167/ARC-164(V) with the exception of the follow-
ing:
CONTROL FUNCTION
Frequency selector
switch 1 (T-2-3-A) Selects 100’s digit of fre-
quency (either 2 or 3) in
MHz. The A position se-
lects the HAVE QUICK
mode. The T position
(spring-loaded) allows
the radio to receive a
new time of day.
3-26. OPERATING PROCEDURE – UHF/AM
RADIO SET (RT-1167/ARC-164(V) or
RT-1167C/ARC-164(V)).
a. Modes of Operation. Depending on the settings
of the operating controls, the radio set can be used for
these modes of operation:
(1) Control (Mode) Settings.
(a) MAN mode: two-way voice commu-
nications.
(b) BOTH mode: utilizing the transceiver
constant monitoring of guard receiver without losing the
use of the transceiver.
(c) Transmission of 1,020 Hz TONE signal.
(2) Transmit/Receive (MAIN) mode.
(a) Set OFF-MAIN-BOTH-ADF selector
switch to MAIN.
(b) Set MANUAL-PRESET-GUARD selec-
tor switch to MANUAL for manual frequency selection or
to PRESET for preset channel selection.
(c) To manually select a frequency, rotate
the five MHz selector switches until desired frequency
is displayed in indicator window.
NOTE
Clockwise rotation of the MHz selector
switches increases frequency.
(d) To select a preset channel, rotate pre-
set channel selector switch until desired channel is dis-
played in preset CHAN indicator window.
NOTE
Clockwise rotation of preset channel se-
lector switch will increase the desired
channel number (1 to 20).
(3) Transmit/Receive/Guard Monitor (BOTH)
mode.
(a) Set OFF-MAIN-BOTH-ADF selector
switch to BOTH.
NOTE
The BOTH position turns on the trans-
ceiver and the guard receiver. The
guard receiver will remain turned to 243
MHz regardless of manual or preset fre-
quencies selected.
(b) Select desired manual frequency or
preset channel. Refer to steps 3-26.a.(2)(c) and (d).
NOTE
If reception on the selected frequency
interferes with guard reception, detune
the set by selecting an open frequency
or place MANUAL-PRESET-GUARD
selector switch to GUARD.