Radio Receivers
The typical squelch circuit cuts off

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

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Radio Receivers
In a ratio detector

stabilization against signal strength variations is provided
the output is twice that obtainable from a similar phase discriminator
the circuit is the same as in a discriminator, except that the diodes are reversed
the linearity is worse than in phase discriminator

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Radio Receivers
In a radio receiver with simple AGC

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

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