General exam question G8A05
Subelement G8, SIGNALS AND EMISSIONS· Group G8A
What type of modulation varies the instantaneous power level of the RF signal?
- A.Power modulation
- B.Phase modulation
- C.Frequency modulation
- D.Amplitude modulation (correct answer)
WhyAmplitude modulation is the type of modulation that varies the instantaneous power level of the RF signal. Amplitude modulation is specifically the technique that varies an RF signal's instantaneous power level (its envelope) in step with the modulating signal, answer D. "Power modulation" isn't a standard modulation type, and phase and frequency modulation instead vary the signal's phase or frequency while its amplitude stays essentially constant.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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