What effect does lowering a signal’s transmitted elevation angle have on ionospheric HF skip propagation?
The correct answer is C: The distance covered by each hop increases. What effect does lowering a signal's transmitted elevation angle have on ionospheric HF skip propagation is that the distance covered by each hop increases. Lower elevation angles result in longer skip distances. For amateur radio operators, this is important for HF operation. Understanding this helps when optimizing antenna elevation.
Exam Tip
Lower elevation angle effect = distance covered by each hop increases. Think 'L'ower 'E'levation = 'L'onger 'E'ach hop. Lower elevation angles result in longer skip distances. Not Faraday rotation, not MUF decrease, not critical frequency - just longer hop distance.
Memory Aid
"Lower elevation angle effect = distance covered by each hop increases. Think 'L'ower 'E'levation = 'L'onger hop. Lower elevation angles result in longer skip distances. Important for HF operation."
Real-World Application
Lowering a signal's transmitted elevation angle: The distance covered by each hop increases. A lower elevation angle means the signal takes off at a shallower angle, bounces off the ionosphere at a greater distance, and covers more ground per hop. This is the effect - longer hop distance with lower elevation.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Faraday rotation doesn't become stronger - lowering elevation increases hop distance. Faraday rotation isn't the effect.
Option B: Incorrect. MUF doesn't decrease - lowering elevation increases hop distance. MUF decrease isn't the effect.
Option D: Incorrect. Critical frequency doesn't increase - lowering elevation increases hop distance. Critical frequency increase isn't the effect.
题目解析
The correct answer is C: The distance covered by each hop increases. What effect does lowering a signal's transmitted elevation angle have on ionospheric HF skip propagation is that the distance covered by each hop increases. Lower elevation angles result in longer skip distances. For amateur radio operators, this is important for HF operation. Understanding this helps when optimizing antenna elevation.
考试技巧
Lower elevation angle effect = distance covered by each hop increases. Think 'L'ower 'E'levation = 'L'onger 'E'ach hop. Lower elevation angles result in longer skip distances. Not Faraday rotation, not MUF decrease, not critical frequency - just longer hop distance.
记忆口诀
Lower elevation angle effect = distance covered by each hop increases. Think 'L'ower 'E'levation = 'L'onger hop. Lower elevation angles result in longer skip distances. Important for HF operation.
实际应用示例
Lowering a signal's transmitted elevation angle: The distance covered by each hop increases. A lower elevation angle means the signal takes off at a shallower angle, bounces off the ionosphere at a greater distance, and covers more ground per hop. This is the effect - longer hop distance with lower elevation.
错误选项分析
Option A: Incorrect. Faraday rotation doesn't become stronger - lowering elevation increases hop distance. Faraday rotation isn't the effect. Option B: Incorrect. MUF doesn't decrease - lowering elevation increases hop distance. MUF decrease isn't the effect. Option D: Incorrect. Critical frequency doesn't increase - lowering elevation increases hop distance. Critical frequency increase isn't the effect.
知识点
Transmitted elevation angle, Ionospheric HF skip propagation, Distance covered by each hop, Elevation angle effect
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.