Radio Receivers
The typical squelch circuit cuts off

An IF amplifier when the AGC is maximum
An IF amplifier when the AGC is minimum
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

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

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Radio Receivers
Show which of the following statements about the amplitude limiter is untrue:

When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
The circuit is always biased in class C, by virtue of the leak-type bias.
Leak-type bias must be used
The output must be tuned

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