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TM 11-5221-277-20
Section Il. DESCRIPTION AND DATA
tronics bay of the aircraft. Control, Radio Set C-
1-5. Purpose and Use
7197/ARC-134 is on the pilot's or copilot's in-
a. Purpose,  Radio  Set  AN/ARC134(*)  wer-
strument panel to facilitate tuning b the desired
ates in the very high frequency (vhf) range,
frequency. Figure 12 is a typical block dia-
116.000 through 149.975 MHz, and uses ampli-
gram of Radio Set AN/ARC134(*) installed in
tude modulation (am.) to provide receive and
an aircraft. Additional equipment (para-10) is
transmit voice communications between aircraft,
necessary to permit Radio Set AN/ARC-134(*)
and between aircraft and fixed or mobile ground
to perform its desired function. A vhf antenna
radio stations. Radio Set AN/ARC-134 (*) has
must be provided on the aircraft to permit re-
the design capability to be tuned to any  one o f
ception and transmission. Headset H1O1A/U,
1 , 3 6 0 channels spaced at 25-kHz intervals
or equivalent, must be available to provide the
throughout its operating frequency range; how-
operator monitoring capability for audio signals
ever, filters supplied with the AN/ARC134(*)
received by Receiver-Transmitter RT-857/ARC
limit channel spacing to 50 kHz and permit the
134. The headset is normally wired through air-
AN/ARC-134(*) to be tuned to only 680 selec-
craft wiring to Control, Intercommunication Set
table channels Alternate filters can be installed
C-1611(D)/AIC,  or equivalent. External push-
which provide a bandpass of 20 kHz for 25-
to-talk switching is also wired through aircraft
kHz channel spacing, providing the 1,360 chan-
wiring to the C1611D/AIC which is wired to
nel tuning capability When used with auxiliary
Receiver-Transmitter RT-857/ARC-134. When
equipment, Radio Set AN/ARC-134(*) receives
the operator presses the push-to-talk switch and
and transmits communication signals for an Air
the transmit
speaks  into  the  microphone,
Traffic control Signaling System (ATCSS).
function of Receiver-Transmitter RT-857/ARG
b. Use. Radio Set AN/ARC-134(*) is normal-
134 is enabled and the desired signal is trans-
ly installed in an aircraft and used by crew-
mitted. When the push-to-t.alk switch is  not
members to establish voice communication with
pressed, Receiver-Transmitter RT-857/ARC-194
crewmembers of other aircraft and personnel in
is in the receive mode. Detected audio signals are
fixed or mobile ground radio stations, Mounting
routed through the C1611D/AIC to the oper-
MT-3791(*)/ARC-l34
Receiver-Trans-
and
mitter RT857/ARC134 are located in the elec-
ator's headset.
Figure 1-2. Typical operational block diagram.
1-2


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