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KEYS AND KNOBS
Left-hand Keys and Knobs
k
In the GNC 420W and the GNS 430W, the
COM power/volume knob controls unit
power and communications radio volume.
Press the knob momentarily to enable/disable
automatic squelch control.
j
In the GNS 430W, the VLOC volume knob
controls audio volume for the selected VOR/
Localizer frequency. Press momentarily to
enable/disable the ident tone.
y
In the GNC 420W and GNS 430W, the large
left knob is used to tune the megahertz
(MHz) value of the standby frequency for
the COM transceiver or the VLOC receiver,
whichever is currently selected by the tuning
cursor.
v
In the GNC 420W and GNS 430W, the small
left knob is used to tune the kilohertz (kHz)
value of the standby frequency for the COM
transceiver or the VLOC receiver, whichever
is currently selected by the tuning cursor.
Press this knob momentarily to toggle the
tuning cursor between the COM and VLOC
windows.
W
In the GNC 420W and GNS 430W, the COM
flip-flop key is used to swap the active and
standby COM frequencies. Press and hold to
select emergency channel (121.500 MHz).
V
In the GNS 430W, the VLOC flip-flop key
is used to swap the active and standby VLOC
frequencies (i.e., make the selected standby
frequency active).
COM flip-flop
COM power/
volume
VLOC volume
Small left knob
VLOC flip-flop
Large left knob
KEYS
AND KNOBS