Basic Qualification · B-007 Radio wave propagation · B-007-007-006
On which amateur radio band is the extended-distance propagation effect of sporadic-E most often observed?
- A160 metres
- B20 metres
- C2 metres
- D6 metres
Correct answer: D — 6 metres. From the official ISED question bank, verified word for word.
Why
Sporadic-E occurs when dense patches of ionisation form in the lower atmosphere, acting like a mirror that bounces radio signals much farther than usual. The full explanation — and one for every question — is in Pro.
Practise this section
Radio wave propagation is section B-007 of the Basic exam: How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.
Drill B-007 — free, no account