Figure 3-3. UHF Control Panel (AN/ARC-164)
or copilot's SATCOM/FM monitor switch has been set to
MONITOR ON, the pilot or copilot will receive audio from
the SATCOM receiver (the deselected receiver). Monitor
volume is controlled by the master volume control, located on
the appropriate pilot's or copilot's audio control panel (fig. 3-
3-9. UHFCOMMAND SET(AN/ARC-164).
Description. The UHF command set is a line-of-
sight radio transceiver which provides transmission and
reception of amplitude modulated (AM) signals in the ultra
high frequency range of 225.000 to 399.975 MHz for a
distance range of approximately 50 miles. Channel selection
is spaced at 0.025 MHz. A separate receiver is incorporated
to provide monitoring capability for the UHF guard frequency
(243.0 MHz). UHF audio output is applied to the audio panel
where it is routed to the headsets.
The PRESET channel selector and
inoperative when the mode selector is set
to GUARD position. The receiver-
transmitter will be set to the emergency
The transmitter and receiver sections of the UHF unit
operate independently but share the same power supply and
frequency control circuits. Separate cables route transmit and
receive signals to their respective receiver/transmitter.
Complete provisions only are installed for a TSEC/KY-
58 voice security device to be located on the INS equipment
rack behind the copilot. The UHF command set is protected
by the 7 1/2 ampere UHF circuit breaker on the overhead
circuit breaker panel (fig. 2-27). Figure 3-3 illustrates the
UHF command set. The associated blade type antenna is
shown in figure 2-1.
Controls and Functions.
UHF control panel (fig. 3-3):
Selects hundreds digit of frequency (either 2 or 3) in MHz.
Manual frequency selector (tens). Selects tens
digit of frequency (O through 9) in MHz.
Manual frequencyselector (units). Selects
units digit of frequency (O through 9) in MHz.
Manual frequencyselector (tenths). Selects
tenths digit of frequency (O through 9) in MHz.