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transmitter selector switch may be set at any
position when using either cyclic stick RADIO/
ICS switch in the ICS position.
The RADIO/ICS switch on either cyclic stick
grip should be pressed to ICS or the CPG footoperated
ICS switch should be pr-e-s-sed
3.6 RADIO SET AN/ARC-186(V).
Radio Set AN/ARC-186(V) is a VHF FM-AM transceiver
that provides clear and secure voice communication
capability at frequencies in the VHF AM and FM
bands. The radio set has a guard frequency of 40.500
MHz for FM and a 121.500 MHz for AM. Over a frequency
range of 108.00 MHz to 115.975 MHz, it functions
as a receiver for the reception of (AM) transmissions.
At frequencies in the range of 116.000 MHz to
(ground crew must press a push-to-talk but- 151.975 MHz, the set operates both as an AM receiver
ton on their ICS cord) to talk on the ICS. and AM transmitter. From 108.000 MHz to 151.975
Speak into the microphone while pressing any MHz, a total of 1760 AM voice communication channels
of these switches. Release switch to listen. spaced at 25 kHz is provided by the set. In a range of
frequencies extended from 30.000 MHz to 87.975 MHz,
3.5.4 External Radio Communication. Both crew- it functions both as an FM receiver and FM transmitmembers
are able to communicate with external receiv- ter. Operating in this frequency range, it provides 2320
ing station in the following manner: FM voice communication channels with a spacing of 25
1.
kHz. The radio set also provides 20 channel presets
Transmitter selector switch is set to the de- which can be any combination of AM or FM frequensired
position, 1 thru 3, for either crew sta- ties. Automatic tuning to both AM and FM emergency
tion. Pilot sets to 5 (C-10414) or RMT frequencies (121.5 MHz and 40.5 MHz, respectively) is
(C-11746) if he wishes to use the remote trans- provided by setting only one control. Power output of
mit select switch. the transmitter is 10 watts.
3-9
TM 1-1520-238-10
3.6.1 Antennas. The FM-AM No. 1 (pilot) commu- tenna fairing.
nication antenna (fig 3-1) is mounted on the vertical
stabilizer as an integral part of the trailing edge assem- 3.6.2 Controls and Functions. Controls for the AN/
bly. Some helicopters have an FM-AM whip antenna ARC-186(V) transceiver are on the front panel (fig 3-4)
mounted on top of the vertical stabilizer replacing the of the unit. The function of each control is as shown in
trailing edge antenna. The FM-AM No. 2 (CPG) com- table 3-3.
munication blade antenna is mounted on the bottom
center fuselage area directly forward of the doppler an-
Figure 3-4. Control Panel AN/ARC-186
3-10
TM 1-1520-233-10
Table 3-3. AN/ARC-186(V) Controls and Functions
Control/Indicator Function
0.025 MHz selector Rotary switch. Selects r/t frequency in 0.025 MHz increments. Clockwise rotation
increases frequency.
0.025 MHz Indicates manually selected r/t frequency in 0.025 MHz increments.
Indicator
0.1 MHz selector Rotary switch. Selects r/t frequency in 0.1 MHz increments. Clockwise rotation increases
frequency.
0.1 MHz indicator Indicates manually selected r/t frequency in 0.1 MHz increments.
1.0 MHz selector Rotary switch. Selects r/t frequency in 1.0 MHz increments. Clockwise rotation increases
frequency.
1.0 MHz indicator Indicates manually selected r/t frequency in 1.0 MHz increments.
10 MHz selector Rotary switch. Selects r/t frequency in 10 MHz increments from 30 to 150 MHz.
Clockwise rotation increases frequency.
10 MHz indicator Indicates manually selected r/t frequency in 10 MHz increments from 30 to 150 MHz.
Present channel Rotary switch. Selects preset channel from 1 to 20. Clockwise rotation increases channel
selector number selected.
Preset channel Indicates selected preset channel.
indicator
Volume control Potentiometer. Clockwise rotation increases volume.
Squelch disable/ Three-position switch. Center position enables squelch. SQ DIS position disables squelch.
tone select Momentary TONE position transmits tone of approximately 1000 Hz.
Frequency control/ Four-position rotary switch. EMER AM/FM selects a prestored guard channel. MAN
emergency select position enables manual frequency selection. PRE position enables preset channel
switch selection.
Mode select switch Three position rotary switch. OFF position turns transceiver off. TR position enables
transmit receive modes. D/l? position is not used.
Bandwidth/memory Three-positions switch. NB position enables narrow band selectivity. WB enables
load switch wideband selectivity in the FM band. Momentary MEM LOAD allows manually selected
frequency to go into selected preset channel memory.
AM squelch control Screwdriver adjustable potentiometer. Squelch overridden at maximum counterclockwise
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