Section 1 - Com - Communicating Using The Gnc 420W/Aw And; Gns 430W/Aw; Volume; Squelch - Garmin GNS 400W Pilot's Manual & Reference

Section 1 - COM -
Communicating Using the
GNC 420W/AW and GNS 430W/AW
Some models of the 400W-series feature a digitally-
tuned VHF COM radio that provides a seamless transi-
tion from communication to navigation. The GNC
420W and GNS 430W' s COM radio operates in the
aviation voice band, from 118.000 to 136.975 MHz,
in 25 kHz steps (default). For European operations, a
COM radio configuration of 8.33 kHz steps is pro-
vided (Section 9 - Aux - Setup 2). The GNC 420AW
and GNS 430AW use a 16-watt transmitter, instead of
the standard 10-watt transmitter.
"TX" appears at the upper right corner of
the screen while transmitting.

Volume

COM radio volume is adjusted using the COM
power/volume knob. Turn the COM power/volume
knob clockwise to increase volume, or counterclock-
wise to decrease volume.
420W / 430W Only

Squelch

The COM radio features an automatic squelch to
reject many localized noise sources. You may override
the squelch function by pressing the COM power/
volume knob. This facilitates listening to a distant sta-
tion or setting the desired volume level.
Press the COM power/volume knob momen-
tarily to override the automatic squelch.
Note the "RX" receive indication when
To override the automatic squelch, press the COM
power/volume knob momentarily. Press the COM
power/volume knob again to return to automatic
squelch operation.
190-00356-00 Rev G
1 - COM
Radio Volume / Auto Squelch
receiving a station.
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