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The high frequencies used on scanner channels cross over into the area where there is a lot of random "white noise", a harsh, loud "hiss". Squelch turns the gain down below the hiss, but hopefully not below the signal. It has to be adjusted carefully, otherwise you eliminate the signal along with the noise.

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Q: What is squelch on a police scanner?
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Related questions

Have a police scanner and the 400 channels have a lot of static what can you do Do I need to buy a digital scanner?

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