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:

Why

The preselector is the correct term because it describes the group of tuned circuits placed before the first amplifier to pick out the desired signal and block others right at the front end of the receiver. The full explanation — and one for every question — is in Pro.

Practise this section

Receivers is section A-006 of the Advanced exam: Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.

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