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transceiver with a fixed-tuned guard receiver.
The transceiver operates on any one of 7,000 channels
spaced in 0.025 MHz units in the 225.000 to 399.975
MHz frequency range. The guard receiver is on a permanent
guard/emergency frequency of 243.000 MHz.
The radio set primarily is used for voice communication.
An additional radio set capability, although not
fictional, is ADF. The radio set receives 28 vdc from
the emergency dc bus through the UHF AM circuit
breaker on the pilot overhead circuit breaker panel.
Receiver-Transmitter RT-1167C/ARC-164 has the same
functions and capabilities as the RT-1167/ARC-164
plus a WWE-QUICK (HQ) mode of operation which
provides an electronic counter counter measures
(ECCM) frequency hopping capability. Radios with the
HQ capability have frequency selector 1 on the extreme
left of the front panel labeled A-3-2-T (fig 3-5). The
single frequency mode of operation is referred to as the
normal mode and the frequency hopping mode of operation
is referred to as the anti-jam (AJ) or ECCM active
mode.
Figure 3-5. Receiver-Transmitter Radio, RT-1167/ARC-164(V)
3-13
TM 1-1520-236-10
3.7.1 Antenna. The UHF-AM antenna (fig 3-1) is lo- 3.7.2 Controls and Functions. Controls for the
cated on the bottom center fuselage area and is ARC-164(V) are on the front panel of the unit (fig 3-5).
mounted directly aft of the doppler fairing. The function of each control is described in table 3-4.
Table 3-4. RT-1167C/ARC-164(V) Controls and Functions
Control
Frequency
selector 1
A-3-2-T selector
switch (RT-1167C
radios only)
A
3 and 2
T
Frequency
selector 2
Frequency
selector 3
Frequency
selector 4
Frequency
selector 5
Preset channel
selector
CHAN indicator
Function selector
switch
MANUAL
PRESET
GUARD
SQUELCH
ON-OFF switch
Function
For the RT-1167, manually selects 100’s digit of frequency (either 2 or 3) in MHz.
Selects AJ mode.
Manually selects 100’s digit of frequency (either 2 or 3) in MHz in normal mode or the
first digit of the WOD in the AJ mode.
Momentary switch position allows the radio to receive a new TOD. Also used with TONE
button for emergency clock start.
Manually selects 10’s digit of frequency (0 through 9) in MHz in normal mode, second
digit of the WOD or first digit of net number in AJ mode.
Manually selects unit digit of frequency (0 through 9) in MHz in normal mode, third digit
of the WOD or second digit of net number in AJ mode.
Manually selects tenths digit of frequency (0 through 9) in MHz in normal mode, fourth
digit of the WOD or third digit of net number in AJ mode.
Manually selects hundredths and thousandths digits of frequency (00, 25, 50 or 75) in
MHz and the fifth and sixth digits of the WOD.
Selects and stores one of 20 preset channels in normal mode or the WOD in AJ mode.
Indicates selected preset channel. Indicator is blanked when radio is in MANUAL or
GUARD mode.
Selects method of frequency selection.
Any of 7,000 frequencies can be manually selected using the five frequency selectors.
A frequency is selected using the preset channel selector switch for selecting any one of
20 preset channels as indicated on the CHAN indicator.
The main receiver and transmitter are automatically tuned to the guard frequency and
the guard receiver is turned off. Any manually set or preset frequency is blocked out.
Turns squelch of main receiver on or off.
3-14
TM 1-1520-236-10
Table 3-4. RT-1167C/ARC-164(V) Controls and Functions - continued
Control Function
VOL control Adjust volume.
TONE button Momentary switch. When pressed, causes 1,020 Hz tone to be transmitted on radio
operating frequency. Transmits TOD followed by a 1,020 Hz tone and used with A-3-2-T
switch for emergency clock start in AJ mode.
Mode selector Selects operating mode.
switch
OFF Turns power off.
MAIN Enables main transceiver.
BOTH Enables main transceiver and guard receiver.
ADF Not used.
PRESET switch Used to load the 20 preset channels in normal mode or WOD in AJ mode. Stores selected
data in specified preset channels.
NB-WB switch Selects wideband or narrowband selectivity of main receiver.
MN-SQ (main Sets the squelch level of the main transceiver
squelch) adjust
GD-SQ (guard Sets the squelch level of the guard receiver.
squelch) adjust
3.7.3 Modes of Operation. The radio set has the following
modes of operation:
a. MAIN mode: Two-way voice communication.
b. BOTH mode: Allows using the main transceiver
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