Extra exam question E4C02
Subelement E4, AMATEUR PRACTICES· Group E4C
Which of the following receiver circuits can be effective in eliminating interference from strong out-of- band signals?
- A.A front-end filter or preselector (correct answer)
- B.A narrow IF filter
- C.A notch filter
- D.A properly adjusted product detector
WhyA front-end filter or preselector is effective at eliminating interference from strong out-of-band signals. A front-end filter or preselector, placed ahead of the receiver's mixer, attenuates strong signals outside the band of interest before they ever reach circuitry that could be overloaded or generate spurious mixing products from them, answer A. A narrow IF filter and product detector operate after the signal has already been converted and don't address out-of-band overload, and a notch filter is meant to remove a specific in-band interfering tone, not broadly reject out-of-band energy.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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