General exam question G4B08
Subelement G4, AMATEUR RADIO PRACTICES· Group G4B
G4B08
What transmitter performance parameter does a two-tone test analyze?
- A.Linearity (correct answer)
- B.Percentage of suppression of the carrier and undesired sideband for SSB
- C.Percentage of frequency modulation
- D.Percentage of carrier phase shift
WhyA two-tone test analyzes a transmitter's linearity. Feeding two non-harmonic tones into an SSB transmitter and examining the resulting spectrum on a scope reveals how much the amplifier distorts the combined signal, which is a direct measure of the amplifier's linearity, answer A. It isn't used to measure carrier/sideband suppression, FM percentage, or carrier phase shift, those are checked with other tests entirely.
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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