HEADQUARTERS OH-58A, Technical Manual

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TM 55-1520-228-10
Change 11 3-8.1
a. Transmit/Receive.
(1) Function selector - As desired.
(2) Frequency - Select.
(3) RCVR TEST - Press to test.
(4) AUDIO - Adjust.
(5) Transmit.
(a) Transmit - Interphone selector - Num-
ber 2 position.
(b) RADIO transmit switch - PRESS.
b. Stopping Procedures. Function Selector -
OFF.
3-22. OPERATING PROCEDURES – UHF/
AM RADIO SET (AN/ARC-164).
a. Transmit/receive.
(1) Function selector - As desired.
(2) Frequency - Select.
(3) TONE - Press to test.
(4) VOL - Adjust.
(5) Transmit.
(a) Transmit - Interphone selector - Num-
ber 2 position.
(b) RADIO transmit switch - PRESS.
b. Stopping Procedure. Function Selector - OFF.
3-23. UHF/AM RADIO SET
(RT-1167/ARC-164(V) or RT-1167C/
ARC-164(V)).
3-24. DESCRIPTION – UHF/AM RADIO SET
(RT-1167/ARC-164(V) or RT-1167C/
ARC-164(V)).
a. RT-1167/ARC-164(V). The Receiver-Transmit-
ter Radio RT-1167/ARC-164(V) (figure 3-6) is an
airborne, ultra-high frequency (UHF), amplitude-modu-
lated (AM), radio transmitting-receiving (transceiver)
set. It contains a multichannel, electronically-tunable
transceiver and a fixed-tuned guard receiver. The trans-
ceiver operates on any one of 7,000 channels spaced in
0.025 MHz units in the 225.000 to 399.750 MHz UHF
military band. The guard receiver is tunable in the
238.000 to 248.000 MHz frequency range with crystal
replacement and realignment (usually 243.000 MHz).
The radio set primarily is used for voice communication.
An additional radio set capability, although not functional
is ADF. Power to operate the ARC-164(V) radio is from
the 28 vdc emergency bus through a circuit breaker
marked UHF-AM on the pilot overhead circuit breaker
panel. UHF/AM Antenna location is shown in figure 3-1.
b. RT-1167C/ARC-164(V). The Receiver-Trans-
mitter Radio RT-1167C/ARC-164(V) (figure 3-6) has the
same functions and capabilities as the
RT-1167/ARC-164(V), plus a HAVE QUICK mode of
operation. HAVE QUICK is an antijamming mode which
uses a frequency hopping scheme to change channels
many times per second. Because the HAVE QUICK
mode depends on a precise time of day, both HAVE
QUICK radios must have synchronized clocks. UHF/AM
Antenna location is shown in figure 3-1.
3-25. CONTROLS AND FUNCTIONS – UHF/
AM RADIO SET (RT-1167/ARC-164(V) or
RT-1167C/ARC-164(V)).
a. RT-1167/ARC-164(V). Controls for the
RT-1167/ARC-164(V) are on the front panel of the unit
(figure 3-6). The function of each control is as follows:
CONTROL FUNCTION
Frequency selector
switch 1 Selects 100’s digit of fre-
quency (either 2 or 3) in
MHz.
Frequency selector
switch 2 Selects 10’s digit of fre-
quency (0 through 9) in
MHz.
Frequency selector
switch 3 Selects units digit of fre-
quency (0 through 9) in
MHz.
Frequency selector
switch 4 Selects tenths digit of
frequency (0 through 9)
in MHz.
Frequency selector
switch 5 Select hundredths and
thousandths digits of fre-
quency (00, 25, 50, or
75) in MHz.
Preset channel
selector switch Selects one of 20 preset
channels.
MANUAL-PRESET-
GUARD selector Selects method of fre-
quency selection.
MANUAL Any of 7,000 frequencies
is manually selected us-
ing the five frequency se-
lector switches.