Technician exam question T4B04
Subelement T4, AMATEUR RADIO PRACTICES· Group T4B
What does an FM signal sound like when received slightly off frequency?
- A.The audio increases in pitch
- B.The audio decrease in pitch
- C.There is no effect except for reduction in amplitude
- D.The audio becomes distorted (correct answer)
WhyAn FM signal received slightly off frequency sounds distorted. An FM receiver's detector expects a signal centered exactly on its tuned frequency; when the signal is off frequency, the recovered audio comes out distorted rather than shifted in pitch, the effect you'd hear tuning an AM or SSB signal off center, answer D. A and B describe a pitch shift, which isn't how FM demodulation reacts to a frequency offset, and C incorrectly claims there's no effect beyond a change in amplitude.
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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