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position. Clockwise rotation increases input signal required to open the squelch.
FM squelch control. Screw driver adjustable potentiometer. Squelch overridden at maximum
counterclockwise position. Clockwise rotation increases input signal required to open the
squelch.
Band lockout Will lock out the AM or FM frequency of the band selected. Presently set to the center
switch (LOCKOUT) position to receive both AM and FM bands.
3-11
TM 1-1520-238-10
3.6.3 Modes of Operation. Depending on the setting
of the operating controls, the radio set can be used for
the following controlled modes of operation:
a. Transmit/Receive (TR) Mode. Two-way in the
clear and secure voice communication. Refer to paragraphs
3.8 through 3.8.2 for voice security system.
1.
2.
3.
Set OFF, TR, -D/F mode select switch to TR.
Set EMER AM/FM, -MAN, -PRE frequency
selector switch to MAN for manual frequency
selection or to PRE for preset channel selection.
To manually select a frequency, rotate the four
MHz selector switches until desired frequency
is displayed at indicator windows.
NOTE
Rotating the MHz selector switches clockwise
increases frequency. Frequencies can
be manually selected in 0.025 MHz increments.
4. To select a preset channel, rotate preset channel
selector switch until the number of the desired
channel is displayed in the CHAN indicator
window.
NOTE
Clockwise rotation of preset channel selector
switch will increase the desired channel
number (1 to 20). The radio set will automatically
tune to the preset channel in
TR mode.
b. DF Mode. Not Used.
c. AM Emergency (EMER AM) mode. Emergency
two-way voice communication on selected guard channel.
1.
2.
Set mode select switch to TR.
Set frequency control/emergency select switch
to EMER AM.
NOTE
Selecting the EMER AM mode will automatically
disable the secure speech function
and enable clear voice communication.
d. FM Emergency (EMER FM) mode. The FM
emergency mode enables voice reception/transmission
on a prestored guard frequency of 40.500 MHz.
3.6.4
1. Set mode select switch to TR.
2. Set EMER AM/FM, -MAN, -PRE frequency
control/emergency select switch to EMER
FM.
NOTE
Selecting the EMER FM mode will automatically
disable the secure speech function
and enable voice communication.
Operating Procedures, Radio Set AN/ARC-186.
a. Squelch Disable. To disable squelch, set
squelch disable tone select SQ DIS/TONE switch to
SQ DIS. Squelch will remain disabled (open) until
switch is returned to center position.
b. Tone Transmission. To transmit (FM or AM)
tone frequency of approximately 1000 Hz, set squelch
disable tone select SQ DIS/TONE switch to the momentary
TONE position. Releasing the switch removes
the tone frequency.
c. Loading Preset Channels.
1.
2.
3.
4.
5.
6.
Set mode select switch to TR.
Set EMER AM/FM-MAN-PRE frequency
control/emergency select switch to MAN.
Rotate the four MHz selector switches until
desired frequency is displayed in indicator
windows.
Rotate CHAN preset channel selector switch
until the desired channel is displayed in the
indicator window.
Remove snap-on cover.
Momentarily hold WB-NB-MEM LOAD
switch to MEM LOAD. Preset frequency is
now loaded into memory.
3-12
d.
e.
Wideband/Narrowband Selection
1.
2.
3.
Remove snap-on cover.
For wideband operation,
LOAD switch to WB.
set WB-NB-MEM
For narrowband operation, set WB-NB-MEM
LOAD switch to NB.
NOTE
The switch shall be placed in the WB position
at anytime the MEM LOAD function
is not being accomplished. The NB position
is not used in this installation.
Band Lockout Selection.
1. Remove snap on cover.
NOTE
With the LOCKOUT-AM-FM switch set
to AM or FM, the frequency of the band
selected will be locked out. This will cause
an audible warning to occur whenever a
frequency in a locked out band is selected.
For this installation, operational AM and
FM bands are required and the LOCKOUT-
AM-FM switch must be set to the
LOCKOUT position.
TM 1-1520-236-10
2. Ensure LOCKOUT-FM-AM switch is in
LOCKOUT position (indicated by a white dot
on the switch).
3.7 RADIO SET RT-1167C/ARC-164(V) AND HAVE
QUICK RADIOS
Receiver-Transmitter RT-1167/ARC-164 (fig 3-5) is an
airborne, (UHF), (AM), radio transmitter-receiver
(transceiver) set. It is a multi-channel, electronicallytunable
　
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