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
Improve the rejection of the image frequency
Provide improved tracking

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Radio Receivers
In a broadcast superheterodyne receiver, the

Mixer input must be tuned to the signal frequency
RF amplifier normally works at 455 kHz above the carrier frequency
Local oscillator frequency is normally double the IF
Local oscillator operates below the signal frequency

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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
Improving the selectivity of the receiver
Improving the effectiveness of the AGC
Reducing the effect of noise at low modulation depths

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