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

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

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Radio Receivers
In a broadcast superheterodyne receiver, the

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

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