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1 - COM
190-00356-00 Rev E
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.
Whilereceivingastation,an“RX”indication
appears in the upper right corner of the COM window
—totheimmediaterightof“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 tuning cursor is not currently in the COM
window, press the small left knob momen-
tarily.
2. Turn the large left knob to select the desired
megahertz (MHz) value. For example, the
“118” portion of the frequency “118.300”.
3. Turn the small left knob to select the desired
kilohertz (kHz) value. For example, the “.300”
portion 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.
TheGNS430W/AWunithasabuilt-inVOR/Localizer/
Glideslopecapability.IfyouwishtoselectaVOR/
localizer/ILS frequency, press the small left knob
momentarily to place the cursor in the VLOC window.
AdditionalinstructionsforVOR/localizer/ILSopera-
tions are available in Sections 5 and 8.
420W / 430W Only