Extra exam question E4D06
Subelement E4, AMATEUR PRACTICES· Group E4D
What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?
- A.Reciprocal mixing
- B.Quieting
- C.Desensitization (correct answer)
- D.Cross modulation interference
WhyDesensitization is the term for reduced receiver sensitivity caused by a strong signal near the received frequency. Desensitization is the term for a receiver's sensitivity dropping because a strong signal near the receive frequency is overloading front-end circuitry, even though that strong signal isn't itself the one being demodulated, answer C. Reciprocal mixing produces audible interference through a different mechanism (LO phase noise), quieting describes an FM receiver's noise dropping as signal strength increases, and cross-modulation interference involves unwanted modulation transfer rather than a general sensitivity reduction.
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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