Extra exam question E4D09
Subelement E4, AMATEUR PRACTICES· Group E4D
What is the purpose of the preselector in a communications receiver?
- A.To store frequencies that are often used
- B.To provide broadband attenuation before the first RF stage to prevent intermodulation
- C.To increase the rejection of signals outside the band being received (correct answer)
- D.To allow selection of the optimum RF amplifier device
WhyA preselector's purpose is to increase rejection of signals outside the band being received. A preselector's job is to increase rejection of signals outside the band currently being received, filtering out strong out-of-band energy before it reaches the mixer and can create image responses or intermodulation products, answer C. It doesn't store frequently used frequencies, isn't primarily a broadband attenuator, and doesn't select which RF amplifier device is in use, those aren't what a preselector does.
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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