General exam question G4D09
Subelement G4, AMATEUR RADIO PRACTICES· Group G4D
What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
- A.14.347 MHz to 14.647 MHz
- B.14.347 MHz to 14.350 MHz (correct answer)
- C.14.344 MHz to 14.347 MHz
- D.14.3455 MHz to 14.3485 MHz
WhyA 3 kHz USB signal with the displayed carrier at 14.347 MHz occupies from 14.347 MHz to 14.350 MHz. USB places all of its energy above the displayed carrier frequency, so a 3 kHz-wide USB signal with the carrier displayed at 14.347 MHz occupies from 14.347 MHz up to 14.350 MHz, answer B. The range in A is far too wide for a 3 kHz voice signal, C extends downward from the carrier, which is LSB behavior, and D's narrower, offset range doesn't match a straightforward 3 kHz USB passband above 14.347 MHz.
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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