Question
What effect does lowering a signal’s transmitted elevation angle have on ionospheric HF skip propagation?
Answer Options
- A) Faraday rotation becomes stronger
- B) The MUF decreases
- C) The distance covered by each hop increases
- D) The critical frequency increases
Correct Answer: C
Explanation
In ionospheric HF propagation, the angle at which the radio wave leaves the antenna (the elevation or takeoff angle) is directly related to the distance covered by a single hop. The lower the angle, the longer the signal travels through the ionosphere before it is refracted back down to Earth. This simple geometric principle is fundamental to long-distance DXing on the HF bands.
Therefore, lowering a signal’s transmitted elevation angle causes the distance covered by each hop to increase. A low angle (typically less than 10 degrees) is essential for maximizing the distance covered by a single hop, a phenomenon that allows a single reflection to cover distances up to 2,500 miles or more, reaching the farthest DX locations.
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