Garmin GNS 480TM GPS Receiver User Manual


 
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Advanced Operation
System Mode
Com Options
The Com Options selection allows you to set up options available for Com radio operation.
1. In the System mode rotate the LARGE knob to display the Com Options page. Press ENT.
2. Rotate the LARGE knob to view the Com Options.
RF Signal Level
The RF Level function shows the relative signal strength of the active frequency. The value
will change as signal conditions change. This information can be used by your dealer to ad-
just the radio squelch break.
Com Noise Level
The Com Noise Level function shows the relative received noise level of the active fre-
quency. The value will change as signal conditions change.
Mic 1 and 2 Squelch
The input levels required to break squelch by the microphones are set by these values.
Lower numbers indicate a higher input level necessary to break squelch. Turn the LARGE
knob to view the option pages. Turn the SMALL knob to change the value. The range is from
0 to 100.
Transmit Mic
The Transmit Microphone page allows you to control which microphone is permitted to
transmit. You may choose Mic 1, 2, or both. To adjust the Transmit Mic control:
1. In the Com Options selection, rotate the LARGE knob to display the Transmit Mic page.
2. Rotate the SMALL knob to select MIC1, MIC2, or MIC1+MIC2.
3. Select an appropriate frequency, key the transmitter, and talk into the microphones to check for the
intended operation.