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What does “squelch” do?

The squelch control adjusts the sensitivity of the receiver.  At the minimum setting, the device will look for RF signals, and won’t filter out weaker signals.  This setting is good for those who will be using their systems from longer distances.  The maximum setting will ensure that only the strongest RF signals will be passed through.  A high squelch setting is better for users who are trying to block out interference.