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

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

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Radio Receivers
Indicate the false statement in connection with communications receivers.

Variable sensitivity is used to eliminate selective fading
Double conversion is used to improve image rejection
A product demodulator could be used for the reception of Morse code.
The noise limiter cuts off the receiver’s output during a noise pulse.

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