2
TAKEOFF TOUR
190-00356-00 Rev B
f
The
small left
knob (COM/VLOC)
(420W/430W only) is used to tune the kilo-
hertz (kHz) value (to the right of the decimal
point) of the standby frequency for the com-
munications transceiver (COM) 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 frequency fields.
W
The
COM flip-flop
key (420W/430W only)
is used to swap the active and standby COM
frequencies. Press and hold to select emer-
gency channel (121.500 MHz).
V
The
VLOC flip-flop
key (430W only) is
used to swap the active and standby VLOC
frequencies (i.e., make the selected standby
frequency active).
Key and Knob Functions
Key and Knob Functions
The 400W-series unit is designed to make operation
as simple as possible. The key and knob descriptions on
the next three pages provide a general overview of the
primary function(s) for each key and knob. This Takeoff
Tour section is intended to provide a brief overview of
the primary functions of your 400W-series unit. Experi-
ment with the unit and refer to the Reference sections
for more information.
Left-hand Keys and Knobs
Left-hand Keys and Knobs
GPS 400W
GNC 420W/AW
GNS 430W/AW
k
The
COM power/volume
knob (420W/430W
only) controls unit power and communications
radio volume. Press momentarily to disable
automatic squelch control. In the GPS 400W,
this control is used only for power.
j
The
VLOC volume
knob (430W only)
controls audio volume for the selected VOR/
Localizer frequency. Press momentarily to
enable/disable the ident tone.
h
The
large left
knob (COM/VLOC)
(420W/430W only) is used to tune the mega-
hertz (MHz) value (to the left of the decimal
point) of the standby frequency for the com-
munications transceiver (COM) or the VLOC
receiver, whichever is currently selected by
the tuning cursor.
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