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TAKEOFF TOUR
190-00356-00 Rev E
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-
municationstransceiver(COM)ortheVLOC
receiver, whichever is currently selected by the
tuning cursor. Press this knob momentarily
to toggle the tuning cursor between the COM
andVLOCfrequencyfields.
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
usedtoswaptheactiveandstandbyVLOC
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)
controlsaudiovolumefortheselectedVOR/
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-
municationstransceiver(COM)ortheVLOC
receiver, whichever is currently selected by
the tuning cursor.