Basic Qualification · B-007 Radio wave propagation · B-007-008-007

On the HF bands, when is scatter propagation most likely involved?

1. A When you receive weak and distorted signals near the maximum usable frequency (MUF)
2. B When the sunspot cycle is at a minimum and D-region absorption is high
3. C At night when propagation is poor
4. D When the F1 and F2 regions are combined

Correct answer: A — When you receive weak and distorted signals near the maximum usable frequency (MUF). From the official ISED question bank, verified word for word.

Why

Scatter propagation happens when you hear weak, distorted signals just as you reach the highest frequency that can bounce off the ionosphere, known as the maximum usable frequency. 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.

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