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

Variable sensitivity
Double conversion
Variable selectivity
Squelch

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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

To allow adequate frequency coverage without switching
To permit easier tracking
Because otherwise an intermediate frequency could not be produced
To help the image frequency rejection

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

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