General exam question G4D08
Subelement G4, AMATEUR RADIO PRACTICES· Group G4D
What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
- A.7.178 MHz to 7.181 MHz
- B.7.178 MHz to 7.184 MHz
- C.7.175 MHz to 7.178 MHz (correct answer)
- D.7.1765 MHz to 7.1795 MHz
WhyA 3 kHz LSB signal with the displayed carrier at 7.178 MHz occupies from 7.175 MHz to 7.178 MHz. LSB places all of its energy below the displayed (suppressed) carrier frequency, so a 3 kHz-wide LSB signal with the carrier displayed at 7.178 MHz occupies from 7.178 MHz down to 7.175 MHz, answer C. The ranges in A and B extend upward from the carrier, which describes USB, not LSB, and D's narrower, offset range doesn't match a straightforward 3 kHz LSB passband below 7.178 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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