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Normally, front-end selectivity is provided by the resonant networks both before and after the RF stage in a superheterodyne receiver. This whole section of the receiver is often referred to as the:
preselector
The preselector comprises all the tuned circuits at the input of the receiver (before and after the RF amplifier, if present, and leading up to the first mixer) that select the desired RF signal and provide initial rejection of out-of-band signals, especially the image frequency.
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