Radio Receivers
To prevent overloading of the IF amplifier in a receiver, one should use

Variable selectivity
Variable sensitivity
Squelch
Double conversion

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

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

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