General exam question G3B12
Subelement G3, RADIO WAVE PROPAGATION· Group G3B
Which of the following is typical of the lower HF frequencies during the summer?
- A.Poor propagation at any time of day
- B.World-wide propagation during daylight hours
- C.Heavy distortion on signals due to photon absorption
- D.High levels of atmospheric noise or static (correct answer)
WhyHigh levels of atmospheric noise or static are typical of the lower HF frequencies during summer. Summer thunderstorm activity drives up atmospheric noise and static, which is especially noticeable and troublesome on the lower HF frequencies, answer D. It doesn't mean propagation is uniformly poor at any time of day, doesn't provide worldwide daytime coverage as a rule, and photon absorption isn't a real cause of signal distortion here.
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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