Why are HF scatter signals in the skip zone usually weak?
The correct answer is A: Only a small part of the signal energy is scattered into the skip zone. Why HF scatter signals in the skip zone are usually weak is that only a small part of the signal energy is scattered into the skip zone. Most energy goes in other directions, with only a small portion scattered into the skip zone. For amateur radio operators, this explains why scatter signals are weak. Understanding this helps explain scatter signal strength.
Exam Tip
HF scatter weak in skip zone = only small part of energy scattered. Think 'S'catter = 'S'mall 'P'art of energy 'S'cattered. Only a small portion of signal energy is scattered into the skip zone - most goes elsewhere. Not magnetosphere, not ground waves, not ducts - just small scattered portion.
Memory Aid
"HF scatter weak in skip zone = only small part of energy scattered. Think 'S'catter = 'S'mall 'P'art. Only a small portion of signal energy is scattered into the skip zone - most goes elsewhere. Explains why scatter signals are weak."
Real-World Application
HF scatter signals in the skip zone are weak because only a small part of the transmitted energy is scattered into that area. Most energy goes in other directions (normal skywave paths, absorbed, etc.), with only a small portion scattered into the skip zone. This is why scatter signals are typically weak and require good receivers and antennas.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Scatter isn't from the magnetosphere - it's from ionospheric irregularities. Magnetosphere isn't involved in HF scatter.
Option C: Incorrect. Scatter isn't via ground waves - it's via skywave paths. Ground waves don't reach the skip zone.
Option D: Incorrect. Scatter isn't via F-region ducts - it's via multiple reflection paths. Ducting is a different phenomenon.
题目解析
The correct answer is A: Only a small part of the signal energy is scattered into the skip zone. Why HF scatter signals in the skip zone are usually weak is that only a small part of the signal energy is scattered into the skip zone. Most energy goes in other directions, with only a small portion scattered into the skip zone. For amateur radio operators, this explains why scatter signals are weak. Understanding this helps explain scatter signal strength.
考试技巧
HF scatter weak in skip zone = only small part of energy scattered. Think 'S'catter = 'S'mall 'P'art of energy 'S'cattered. Only a small portion of signal energy is scattered into the skip zone - most goes elsewhere. Not magnetosphere, not ground waves, not ducts - just small scattered portion.
记忆口诀
HF scatter weak in skip zone = only small part of energy scattered. Think 'S'catter = 'S'mall 'P'art. Only a small portion of signal energy is scattered into the skip zone - most goes elsewhere. Explains why scatter signals are weak.
实际应用示例
HF scatter signals in the skip zone are weak because only a small part of the transmitted energy is scattered into that area. Most energy goes in other directions (normal skywave paths, absorbed, etc.), with only a small portion scattered into the skip zone. This is why scatter signals are typically weak and require good receivers and antennas.
错误选项分析
Option B: Incorrect. Scatter isn't from the magnetosphere - it's from ionospheric irregularities. Magnetosphere isn't involved in HF scatter. Option C: Incorrect. Scatter isn't via ground waves - it's via skywave paths. Ground waves don't reach the skip zone. Option D: Incorrect. Scatter isn't via F-region ducts - it's via multiple reflection paths. Ducting is a different phenomenon.
知识点
HF scatter, Skip zone, Weak signals, Scattered energy
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.