Radio Receivers
The typical squelch circuit cuts off

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

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

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

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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
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that

Production of AGC is a rather complicated process
The receiver cannot use a phase comparator for AFC
Adjacent-channel rejection is more difficult
The transmission is not compatible with A3E

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