Radio Receivers
One of the main functions of the RF amplifier in a superheterodyne receiver is to

Permit better adjacent-channel rejection
Increase the tuning range of the receiver
Provide improved tracking
Improve the rejection of the image frequency

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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
Adjacent-channel rejection is more difficult
The receiver cannot use a phase comparator for AFC
The transmission is not compatible with A3E

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Radio Receivers
In a ratio detector

the linearity is worse than in phase discriminator
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

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