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channel frequency.
EMER FM Radio is tuned to FM Guard
channel frequency.
MAN Allows manual tuning of radio
operating frequency.
PRE Allows selection of any 20 preset
operating frequencies.
VOL Rotary control adjusts radio
output volume.
SQ DIS/TONE
Switch
Three position toggle switch
used to select radio squelch
operations.
Normal (center
position)
Preset squelch level is selected.
SQ DIS Squelch operation is disabled.
TONE Not used - maintenance operation
only.
Preset Channel Selector
Twenty position rotary control
used to select any 20 preset
channel frequencies.
CHAN Display selected radio operating
preset channel.
CONTROLS/
INDICATOR
FUNCTION
Frequency Controls Four rotary controls used to
manually select radio operating
frequency.
10 MHz Control Thirteen position (03 through
17) rotary control used to select
first and second digits of
operating frequency.
1 MHz Control Ten position (0 through 9)
rotary control used to select
third digit of operating frequency.
0.1 MHz Control Ten position (0 through 9)
rotary control used to select
fourth digit of operating frequency
0.025 MHz Control Four position rotary control
used to select fifth and sixth
digits (00 through 75) of operating
frequency in 0.025 MHz
increments.
Frequency Display Display selected radio operating
frequency.
WB/NB/MEM LOAD
Switch (under channel
card)
Three position toggle switch
used to select radio operating
band, and during preset channel
frequency loading.
NB Places radio in NB (narrow
band) operation.
WB Places radio in WB (wide
band) operation.
NOTE
Switch will remain in WB position unless
otherwise instructed by radio set controller.
MEM LOAD Momentary contact position
used with frequency controls
and channel selector to load
preset channels.
3-2-15. Normal Operation – AM/FM Radio Set.
The following steps provide operating procedures.
a. Starting.
(1) Interphone control panel -— Set switches as
follows:
(a) Receiver 3 switch — ON
(b) Selector switch — 3.
(2) VHF ANT SEL switch — SYS 2 – SYS 1.
TM 1-1520-240-10
3-2-11
Figure 3-2-5. VHF AM/FM Radio Set (AN/ARC-186)
b. Transmit-receiver mode.
(1) Mode select switch — TR.
(2) Frequency Control/Emergency Select
Switch — As required. If greater receiver sensitivity is
required, set the SQ DIS/TONE switch to SQ DIS.
(3) VOL control — As required.
c. Stopping. Mode select switch — OFF.
d. Presetting channels. Perform the following steps
to preset a channel to a desired frequency.
(1) Mode select switch — TR.
(2) Frequency select switch — MAN.
(3) Rotate the four frequency select switches
until the desired frequency is displayed.
(4) Rotate the preset channel selector until the
desired channel appears in the preset CHAN indicator.
(5) Remove the snap-on cover.
(6) Momentarily set the bandwidth WB, NB,
MEM LOAD switch to MEM LOAD. The preset frequency
is now in memory.
(7) Using a soft lead pencil, record the loaded
frequency opposite the channel number on the snap-on
cover.
(8) Using the above procedure, preset any other
channels and install the snap-on cover.
3-2-16. VHF/FM Radio Set (AN/ARC-201).
The AN/ARC-201 is located on the pilot instrument panel
and provides two-way frequency modulated (FM narrow
band voice communications.
a. The following items from the airborne radio system.
ITEM DESCRIPTION
1. Receiver-Transmitter Radio Panel Mounted
(RT-1476)
2. Amplifier (AM 7189)
b. Essential Operational Technical Characteristics.
Except where specifically indicated otherwise, the following
operational/technical parameters are the minimum
essential characteristics. Unless otherwise specified,
they apply to each radio configuration.
TM 1-1520-240-10
3-2-12
c. Frequency Range. The frequency range is 30 to
87.975 MHz channelized in tuning increments of 25 kHz.
In addition a frequency offset tuning capability of -10 kHz,
-5kHz, +1kHz is provided in both receive and transmit
mode; this frequency is not used in the ECCM mode.
d. Homing.
(1) Mode select switch — HOM.
(2) Operating frequency — Set.
NOTE
Any strong single channel signal within the
frequency range of the radio set can be used
for homing.
(3) FM button on HSI MODE SELECT PANEL
　
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