Radio Receivers
The typical squelch circuit cuts off

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

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Radio Receivers
In a ratio detector

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
stabilization against signal strength variations is provided
the linearity is worse than in phase discriminator

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Radio Receivers
Indicate the false statement in connection with communications receivers.

The noise limiter cuts off the receiver’s output during a noise pulse.
A product demodulator could be used for the reception of Morse code.
Double conversion is used to improve image rejection
Variable sensitivity is used to eliminate selective fading

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