Radio Receivers
The typical squelch circuit cuts off

an audio amplifier when the carrier is absent
An IF amplifier when the AGC is minimum
An IF amplifier when the AGC is maximum
RF interference when the signal is weak

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Radio Receivers
In a radio receiver with simple AGC

The audio stage gain is normally controlled by the AGC
The highest AGC voltage is produced
The faster the AGC time constant the more accurate the output
An increase in signal strength produces more AGC

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