2. PLAIN/CIPHER switch (CIPHONY
position and will increase volume by turning clockwise.
control-indicator) - PLAIN.
This knob also overrides the automatic squelch by
pulling it out for audio test.
3. Mode selector (UHF control panel) -
The radios are protected by two 7 1/2-ampere circuit
breakers placarded COMM VHF 1 VHF 2, located on the
4. Microphone switch - Press.
3-10. VHF Command Sets (KY 196).
b. Controls and Functions .
a. Description. Identical VHF command sets are
(1) Active frequency display.
provided for the pilot and copilot, COMM 1 and COMM 2
frequency being used.
(2) Transmit symbol. A letter T will appear
way voice communication within the frequency range of
between the USE and STANDBY windows when the
118.000 MHz to 135. 975 MHz, in 25 kHz increments.
transceiver is in the transmit mode of operation.
Active and standby frequencies may be transferred at
anytime, by pressing a frequency transfer button. The
(3) Standby frequency display.
frequency is tuned by the selector on the right side of the
frequency selected for standby.
unit. It may be tuned in ascending or descending order,
by rotating the selector clockwise or counterclockwise.
(4) Frequency selector
The outer larger selector knob is used to change the
frequencies in MHz and kHz.
MHz portion of the frequency while the smaller knob
changes the kHz portion. The 5 kHz units will not be
indicated in the readout display.
(b) kHz knob. Selects kHz frequencies.
The OFF-PULL TEST control knob turns power off to
the unit by rotating counterclockwise to the detent
Active frequency display
Standby frequency display
Frequency selector knobs
OFF-PULL TEST switch
Frequency transfer button
Figure 3-5. VHF Control Panel
3-8 Change 5