General exam question G4D11
Subelement G4, AMATEUR RADIO PRACTICES· Group G4D
How close to the upper edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide USB?
- A.At least 3 kHz above the edge of the band
- B.At least 3 kHz below the edge of the band (correct answer)
- C.At least 1 kHz above the edge of the segment
- D.At least 1 kHz below the edge of the segment
WhyWhen using 3 kHz wide USB, the displayed carrier frequency should be at least 3 kHz below the upper edge of the band's phone segment. Because USB energy extends upward from the displayed carrier frequency, staying inside a band's phone segment on USB means keeping the displayed carrier at least the full 3 kHz bandwidth below the segment's upper edge, so the whole signal, which extends above the carrier, stays inside the segment, answer B. Placing the carrier above the edge, or only 1 kHz below it, would let part or all of a 3 kHz-wide signal fall outside the authorized segment, so A, C, and D don't provide adequate clearance.
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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