Extra exam question E8D08
Subelement E8, SIGNALS AND EMISSIONS· Group E8D
What parameter evaluates distortion of an AFSK signal caused by excessive input audio levels?
- A.Signal-to-noise ratio
- B.Baud error rate
- C.Repeat Request Rate (RRR)
- D.Intermodulation Distortion (IMD) (correct answer)
WhyIntermodulation Distortion (IMD) is the parameter that evaluates distortion of an AFSK signal caused by excessive input audio levels. Intermodulation Distortion (IMD) is the parameter used to evaluate distortion in an AFSK signal caused by excessive input audio levels, measuring the unwanted mixing products that appear when a nonlinear stage is driven too hard, answer D. Signal-to-noise ratio, baud error rate, and "Repeat Request Rate" describe different aspects of link performance, not specifically the distortion generated by overdriving the audio input.
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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