Radio Receivers
The typical squelch circuit cuts off

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

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Radio Receivers
In a ratio detector

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

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Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Reducing the effect of negative-peak clipping
Improving the effectiveness of the AGC
Reducing the effect of noise at low modulation depths
Improving the selectivity of the receiver

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