Radio Receivers
The typical squelch circuit cuts off

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

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Radio Receivers
In a broadcast superheterodyne receiver, the

Mixer input must be tuned to the signal frequency
Local oscillator operates below the signal frequency
RF amplifier normally works at 455 kHz above the carrier frequency
Local oscillator frequency is normally double the IF

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