Noise Level; Headphone Level; Mic Squelch 1 And 2; Transmit Mic - Garmin SL40 Pilot's Manual

Noise Level

The Noise Level function shows the relative received noise level of the frequency you are listening
to. The range displayed is between 0 and 255. The value will constantly change as you are viewing it as
signal conditions change.

Headphone Level

The Headphone Level function allows you to adjust the headphone audio level. Turn the Small knob
to change the value. Setting the value to 0 slaves the headphone audio level to the volume control knob.
The range is from 0 to 255.

Mic Squelch 1 and 2

The input level required to break squelch by the microphone is set from this page. Lower numbers
indicate a higher input level necessary to break squelch. Turn the Small knob to change the value. The
range is from 0 to 127.

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. Press and hold the MON button for about two seconds. This will access the System Functions mode.
2. Rotate the Large knob to display the Transmit Mic page.
3. Rotate the Small knob to select MIC1, MIC2, or MIC1+MIC2.
4. Press any key to exit the Setup Functions mode.
5. Select an appropriate frequency, key the transmitter, and talk into the microphones to check for the
intended operation.
Detailed Operation
System Functions
NOISE 017
Noise Level
Hdphone Lvl 100
Noise Level
Mic1 Sqlch 100
Mic Squelch Level
Transmit Mic 1
Transmit Mic Selection
11