Change 3 3-15
Always key the microphone after selecting a new
frequency to initiate antenna tuning. Otherwise
poor reception or failure to hear a ground station
which is calling you may be experienced.
Before keying the microphone to talk, you should
depress the store (STO) switch momentarily.
This will allow you to listen on the transmit fre-
quency to see if another aircraft is calling the
same ground station.
Some Canadian public correspondence stations
require the reception of a 1,000 Hz signal from
an aircraft calling the station before it will answer.
This signal may be sent by keying the radio and
then simultaneously depressing the store (STO)
3-12. VHF-FM TRANSCEIVER (AN/ARC-201A(V),
a. Description. The single channel ground and air-
borne radio system (SINCGARS, AN/ARC-201(V)) pro-
vides VHF-FM radio communications. The frequency
range is 30 to 87.975 MHz. The system provides for
secure communications through interfacing with a voice
security system. The system is protected by a 10-ampere
circuit breaker placarded FM, located on the overhead
circuit breaker panel (fig. 2-7).
Control of the VHF-FM transceiver is provided by the
aircraft survivability equipment/avionics control system
b. Normal Operation.
Some operations in the VHF-FM transceiver re-
quire several seconds to accomplish. While
these operations are active, the TUNING legend
(multifunction display, fig. 4-2), will be displayed
and some bezel buttons will become inactive
until tuning is complete.
(1) Turn-on Procedure.
1. BATTERY switch (overhead control panel,
fig. 2-13) - ON.
2. AVIONICS MASTER POWER switch (over-
head control panel, fig. 2-13) - ON
3. Transmitter-intercom selector switch (audio
control panel, fig. 3-1) - 2.
4. FM/AM alternate communication selector
switch (pedestal extension, fig. 2-12) - As
5. D mode selector switch (multifunction dis-
play, fig. 4-2) - Depress to select COMM
On power-up, the transceiver is put into the self-
test mode for approximately 30 seconds. During
this period, the legend TUNING is displayed ad-
jacent to L1 on the COMM control page and at
the top center of this page and the transceiver
will not respond to operator inputs.
(2) COMM control page. The COMM control
page shows the status of the VHF-FM and has a frequen-
cy list. Radio name, mode of operation, selected channel
and frequency (or hopset number/AJ NET number), and
plain/cipher indications are presented. Two arrows indi-
cate which transceiver each pilot has selected with the
transmitter-intercom selector switch (audio control pan-
el, fig. 3-1).
NOT INST - The aircraft is configured for the equip-
ment but it is not installed.
FAIL - The equipment has failed.
Blank - No legend at the bezel switch indicates that
the aircraft is not configured for the equipment.
The following definitions apply to the legend ad-
jacent to the bezel switches:
If L1 line selection switch is depressed with the
The FM frequency list will be displayed in the box in
the center of the multifunction display (MFD).
The HOPSET/LOCKSET list will be displayed in the
box in the center of the MFD if the frequency hopping
mode is active.
The legend at R4 will change to FM FREQ.
The legend at R5 will change to 2-FM SETUP.
If the VHF-FM transceiver is in the single channel
mode and valid data is scratchpadded, depressing L1 will
cause the transceiver to be returned and the display at
L1 to be updated to reflect the scratchpadded data. Valid
A channel (1 through 20, or C or E).
A frequency (30,000 to 87.975 with leading and trail-
ing zeroes and decimal points optional).