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

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

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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.
Leak-type bias must be used
The circuit is always biased in class C, by virtue of the leak-type bias.
The output must be tuned

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