Garmin SL40 SL 40 User Guide - Page 17
Noise Level, Headphone Level, Mic Squelch 1 and 2, Transmit Mic, NOISE, Mic1 Sqlch
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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