Figure 3-4. HF Control Panel (KCU-951)
not functional when the FREQ/CHAN switch is in the
CHAN position. The inner knob will provide channel
control from 1 through 99, displayed at the right end of
the display window.
STO (Store) recessed switch. Stores
displayed data when programming preset channels.
(10) OFF-VOLUME control. Applies power to the unit
and controls the audio output level.
SQUELCH control. Provides variable
squelch threshold control.
CLARIFIER control. Provides 250 Hz
of local oscillator adjustment.
Turn on procedure:
It is presumed aircraft power is on and
normally used avionic circuit breakers
Avionics master power switch
clockwise out of OFF position. Adjust volume as
Frequency operation (simplex only):
OFF-VOLUME Switch -. Turn clockwise out of OFF
position. Adjust volume as desired.
Each digit of the frequency may be
selected instead of dialing up or down
to a frequency. The larger concentric
knob is used to select the digit to be
changed. This digit will flash when
selected. Rotation of the knob moves
the flashing cursor in the direction of
rotation. After the digit to be changed
is flashing, the smaller concentric
knob is used to select the numeral
desired. This process is repeated until
the new frequency has been ;elected.
The flashing cursor may then be
stowed by moving it to the extreme left
or right of the display and then one
more click. This stows the cursor
behind the display until needed again.
The cursor may be recalled by turning
the concentric knob one click left or