General exam question G8A04
Subelement G8, SIGNALS AND EMISSIONS· Group G8A
What emission is produced by a reactance modulator connected to a transmitter RF amplifier stage?
- A.Multiplex modulation
- B.Phase modulation (correct answer)
- C.Amplitude modulation
- D.Pulse modulation
WhyA reactance modulator connected to a transmitter RF amplifier stage produces phase modulation. A reactance modulator varies a stage's effective capacitance or inductance in step with the modulating signal, which shifts the RF carrier's phase rather than its amplitude, producing phase modulation, answer B. It doesn't produce multiplexed, amplitude, or pulse modulation, those come from entirely different modulator circuits.
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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