General exam question G8A07
Subelement G8, SIGNALS AND EMISSIONS· Group G8A
Which of the following phone emissions uses the narrowest bandwidth?
- A.Single sideband (correct answer)
- B.Vestigial sideband
- C.Phase modulation
- D.Frequency modulation
WhySingle sideband uses the narrowest bandwidth of the common phone emissions. Single sideband phone transmits only one sideband and suppresses the carrier entirely, which gives it the narrowest occupied bandwidth of the common phone emission types, answer A. Vestigial sideband retains a partial second sideband, and phase and frequency modulation both spread energy across a wider bandwidth than a suppressed-carrier single-sideband signal does, so B, C, and D are all wider.
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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