Technician exam question T7B05
Subelement T7, PRACTICAL CIRCUITS· Group T7B
Which of the following might reduce interference by an amateur station to a non-amateur over-the-air radio receiver?
- A.Block the amateur signal with a filter at the antenna input of the affected receiver (correct answer)
- B.Block the interfering signal with a filter on the amateur transmitter
- C.Switch the transmitter from FM to SSB
- D.Switch the transmitter to a narrow-band mode
WhyBlocking the amateur signal with a filter at the antenna input of the affected receiver might reduce interference to a non-amateur over-the-air radio receiver. When a non-amateur receiver is being overloaded by a nearby amateur signal, installing a filter right at that receiver's antenna input to block the amateur's frequency is usually the most effective fix, since the problem is the victim receiver's front end, not the amateur transmitter's output, answer A. B mistakenly proposes filtering out the interfering signal at the transmitter that's producing it, which does nothing, and switching modes (C) or going narrowband (D) doesn't address a receiver that simply can't reject a strong nearby signal.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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