Basic Qualification · B-007 Radio wave propagation · B-007-003-009
Skip is a term associated with signals from the ionosphere. What causes skip?
- A Refraction by the ionosphere
- B Selective fading of local signals
- C High gain antennas are being used
- D Local cloud cover
Correct answer: A — Refraction by the ionosphere. From the official ISED question bank, verified word for word.
Why
Skip happens when radio waves bend back toward Earth as they pass through the ionosphere, a layer of charged particles high in the sky. The full explanation — and one for every question — is in Pro.
Practise this section
How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.