RT-1167C/ARC-164(V) Controls and Functions continued
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.
Selects operating mode.
Turns power off.
Enables main transceiver.
Enables main transceiver and guard receiver.
Used to load the 20 preset channels in normal mode or WOD in AJ mode. Stores selected
data in specified preset channels.
Selects wideband or narrowband selectivity of main receiver.
Sets the squelch level of the main transceiver
Sets the squelch level of the guard receiver.
3.7.3 Modes of Operation.
The radio set has the fol-
lowing modes of operation:
a. MAIN mode:
Two-way voice communication.
b. BOTH mode:
Allows using the main transceiver
with constant monitoring of the guard receiver.
c. GUARD mode:
Allows transmission and recep-
tion on guard frequency.
d. Normal Mode:
Single frequency used.
e. HQ mode:
The HQ mode of operation provides a
jam resistant capability by means of a frequency hopping
technique that changes frequency many times per sec-
ond. Automatic frequency changing in an apparently ran-
dom manner provides the jam resistance of the radio. The
HQ radios permit communication in radio-jamming envi-
ronments. Three elements are required for uninterrupted,
successful communication. Radios must use the word-of-
day (WOD), be time-synchronized with each other with a
time-of-day (TOD), and share a common net.
Common frequencies, hopping pat-
tern, and rate are determined by the operator entered
WOD. The WOD is a secret, tactical, multi-digit code that
changes daily, and is available worldwide to all HQ us-
The WOD programs the radio with the frequency hopping
pattern and rate. The hundredths/thousandths digits in the
channel 20 WOD element program the frequency hop rate
with .00 being the slowest and .75 being the fastest. WOD
elements vary in number and are entered by using one or
more of the six preset channels 20 through 15. Channels
containing WOD elements cannot be used in the normal
preset function. Transmissions can be made in WOD
channels, but they will not be on the frequency stored in
the preset channel memory.