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

Permit better adjacent-channel rejection
Provide improved tracking
Improve the rejection of the image frequency
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:

The output must be tuned
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.

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Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Reducing the effect of noise at low modulation depths
Improving the selectivity of the receiver
Improving the effectiveness of the AGC
Reducing the effect of negative-peak clipping

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Radio Receivers
In a radio receiver with simple AGC

The faster the AGC time constant the more accurate the output
The highest AGC voltage is produced
An increase in signal strength produces more AGC
The audio stage gain is normally controlled by the AGC

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