24
1 - COM
190-00356-00 Rev B
Com Window and Tuning
COM Window and Tuning
Communication frequencies are selected with the
tuning cursor in the
standby
COM frequency field,
and using the
small
and
large
left
knobs to dial in
the desired frequency. The standby frequency always
appears below the
active
frequency. The active fre-
quency is the frequency currently in use for transmit
and receive operations.
Tuning cursor in the COM window. Use the
small and large left knobs to dial in the
desired standby frequency.
A frequency may also be quickly selected from the
database by simply highlighting the desired frequency
on any of the main pages and pressing the
ENT
key.
This process is referred to as
auto-tuning
. Once a
frequency is selected in the standby field, it may be
transferred to the active frequency by pressing the
COM flip-flop
key.
Once the standby frequency is selected, use
the COM flip-flop key to make the frequency
active for transmit and receive operations.
While receiving a station, an “RX” indication
appears in the upper right corner of the COM window
— to the immediate right of “COM”. A “TX” indication
appears at this location while you are transmitting.
NOTE:
The tuning cursor will normally appear
in the COM window, unless placed in the VLOC
window by pressing the
small left knob
. When
the tuning cursor is in the VLOC window, it will
automatically return to the COM window after 30
seconds of inactivity. This does not apply to the
GNS 420W.
The active frequency in either window cannot be
accessed directly—only the standby frequency will be
highlighted by the tuning cursor.
To select a COM frequency:
1. If the tunng cursor s not currently n the COM
wndow, press the
small left
knob momen-
tarly.
2. Turn the
large left
knob to select the desred
megahertz (MHz) value. For example, the
“118” porton of the frequency “118.300”.
3. Turn the
small left
knob to select the desred
klohertz (kHz) value. For example, the “.300”
porton of the frequency “118.300”.
To make the standby frequency the active fre-
quency, press the COM flip-flop key.
The tuning cursor will remain in the
COM window
.
The GNS 430W/AW unit has a built-in VOR/Localizer/
Glideslope capability. If you wish to select a VOR/
localizer/ILS frequency, press the
small left
knob
momentarily to place the cursor in the
VLOC window
.
Additional instructions for VOR/localizer/ILS opera-
tions are available in Sections 5 and 8.
420W / 430W Only
190-00356-00_0B.indd 24
9/7/2007 2:49:05 PM
