Basic Qualification · B-007 Radio wave propagation · B-007-004-011
If a radio transmission follows two or more different paths during propagation, the received signal may degrade due to fading. What other type of degradation can occur?
- A Frequency shift
- B Heterodyne squeal
- C Higher noise floor
- D Phase-shift distortion
Correct answer: D — Phase-shift distortion. From the official ISED question bank, verified word for word.
Why
When a radio signal travels along two or more paths, the copies arrive at the receiver at slightly different times, causing their phases to misalign. 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.