231 - COMSection 1Communicating using theGNS 530WThe GNS 530W features a digitally-tuned VHFCOM radio that provides a seamless transition fromcommunication to navigation. The GNS 530W’sCOM radio operates in the aviation voice band, from118.000 to 136.975 MHz, in 25 kHz steps (default).For European operations, a COM radio configurationof 8.33 kHz steps is also provided.“TX” appears at the upper right corner of theCOM window while transmitting.VolumeCOM radio volume is adjusted using the COMpower/volume knob. Turn the COM power/volumeknob clockwise to increase volume, or counterclock-wise to decrease volume.SquelchThe COM radio features an automatic squelch toreject many localized noise sources. You may overridethe squelch function by pressing the COM power/volume knob. This facilitates listening to a distant sta-tion or setting the desired volume level.While receiving a station, an “RX” indicationappears in the upper right corner of the COMwindow — to the immediate right of “COM”. A “TX”indication appears at this location while you are trans-mitting.Press the COM power/volume knob momen-tarily to override the automatic squelch.Note the “RX” receive indication whenreceiving a station.To override the automatic squelch, press theCOM power/volume knob momentarily. Press COMpower/volume knob again to return to automaticsquelch operation.Radio Volume / Auto SquelchGNS 530W only
