Question
Why are HF scatter signals in the skip zone usually weak?
Answer Options
- A) Only a small part of the signal energy is scattered into the skip zone
- B) Signals are scattered from the magnetosphere, which is not a good reflector
- C) Propagation is via ground waves, which absorb most of the signal energy
- D) Propagation is via ducts in the F region, which absorb most of the energy
Correct Answer: A
Explanation
The skip zone is the area between the limit of ground-wave coverage and the point where the first skywave signal returns to Earth. HF scatter allows signals to be heard in this zone. However, scatter propagation is a highly inefficient process because the radio energy is not being focused or strongly refracted.
Instead, only a small part of the signal energy is scattered into the skip zone from the intended path. Consequently, the received scatter signal is typically very weak and fades severely (fluttering), making it useful primarily for marginal communication or propagation analysis.
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