Basic Qualification · B-007 Radio wave propagation · B-007-004-005
A transmitted radio signal reaches a receiver by both one-hop and two-hop skip paths. What can small changes in the ionosphere cause?
- A A shift in signal frequency
- B Variations in signal strength
- C Consistently weaker signals
- D Consistently stronger signals
Correct answer: B — Variations in signal strength. From the official ISED question bank, verified word for word.
Why
When a signal arrives via both one-hop and two-hop paths, the waves can either reinforce or cancel each other out depending on their alignment. 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.