General exam question G3B01
Subelement G3, RADIO WAVE PROPAGATION· Group G3B
What is a characteristic of skywave signals arriving at your location by both short-path and long-path propagation?
- A.Periodic fading approximately every 10 seconds
- B.Signal strength increased by 3 dB
- C.The signal might be cancelled causing severe attenuation
- D.A slightly delayed echo might be heard (correct answer)
WhyA skywave signal arriving by both short-path and long-path propagation at once may produce a slightly delayed echo. Because the long-path route around the globe covers more distance than the short path, a signal arriving by both routes at once typically shows up as two copies with a slight time offset, heard as a faint delayed echo, answer D. Fixed 10-second periodic fading, a flat 3 dB strength boost, and complete cancellation aren't the actual characteristic multi-path arrivals like this produce.
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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