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The squelch adjustment sets a threshold for the signals/transmissions that you hear -- it lets you listen to actual transmissions without hearing the "dead" noise when a frequency is not active. With the radio on and set to a specific frequency, turn the squelch down until you hear the noise, then turn it up slowly until the noise stops. This will be the ideal squelch/threshold setting for that particular frequency, and you may need to adjust the setting for other frequencies.

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Q: What does squelch mean on airband radios?
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