What type of propagation allows signals to be heard in the transmitting station’s skip zone?
The correct answer is B: Scatter. The type of propagation that allows signals to be heard in the transmitting station's skip zone is scatter. Scatter propagation occurs when signals are scattered by ionospheric irregularities into the skip zone (the area between ground wave and first skywave return). For amateur radio operators, this explains how signals can be received in areas that normally wouldn't receive them. Understanding this helps explain scatter propagation.
Exam Tip
Skip zone reception = scatter propagation. Think 'S'kip 'Z'one = 'S'catter 'Z'ones. Scatter propagation allows signals to be heard in the skip zone through ionospheric irregularities. Not Faraday rotation, chordal hop, or short-path - just scatter.
Memory Aid
"Skip zone reception = scatter propagation. Think 'S'kip 'Z'one = 'S'catter 'Z'ones. Scatter propagation allows signals to be heard in the skip zone through ionospheric irregularities. Only propagation mode that fills the skip zone."
Real-World Application
You transmit on 20 meters, and your signal is received 200 miles away - within your skip zone (too far for ground wave, too close for normal skywave). This is scatter propagation - your signal is scattered by ionospheric irregularities into the skip zone. Scatter is the only propagation mode that fills the skip zone.
Key Concepts
Why Other Options Are Wrong
Option A (Faraday rotation): Incorrect. Faraday rotation is the rotation of polarization in the ionosphere, not a propagation mode that fills the skip zone. It doesn't explain skip zone reception.
Option C (Chordal hop): Incorrect. Chordal hop is a type of multi-hop propagation, not a mode that fills the skip zone. It's a different propagation mechanism.
Option D (Short-path): Incorrect. Short-path is the direct route, not a mode that fills the skip zone. Short-path doesn't explain skip zone reception.
题目解析
The correct answer is B: Scatter. The type of propagation that allows signals to be heard in the transmitting station's skip zone is scatter. Scatter propagation occurs when signals are scattered by ionospheric irregularities into the skip zone (the area between ground wave and first skywave return). For amateur radio operators, this explains how signals can be received in areas that normally wouldn't receive them. Understanding this helps explain scatter propagation.
考试技巧
Skip zone reception = scatter propagation. Think 'S'kip 'Z'one = 'S'catter 'Z'ones. Scatter propagation allows signals to be heard in the skip zone through ionospheric irregularities. Not Faraday rotation, chordal hop, or short-path - just scatter.
记忆口诀
Skip zone reception = scatter propagation. Think 'S'kip 'Z'one = 'S'catter 'Z'ones. Scatter propagation allows signals to be heard in the skip zone through ionospheric irregularities. Only propagation mode that fills the skip zone.
实际应用示例
You transmit on 20 meters, and your signal is received 200 miles away - within your skip zone (too far for ground wave, too close for normal skywave). This is scatter propagation - your signal is scattered by ionospheric irregularities into the skip zone. Scatter is the only propagation mode that fills the skip zone.
错误选项分析
Option A (Faraday rotation): Incorrect. Faraday rotation is the rotation of polarization in the ionosphere, not a propagation mode that fills the skip zone. It doesn't explain skip zone reception. Option C (Chordal hop): Incorrect. Chordal hop is a type of multi-hop propagation, not a mode that fills the skip zone. It's a different propagation mechanism. Option D (Short-path): Incorrect. Short-path is the direct route, not a mode that fills the skip zone. Short-path doesn't explain skip zone reception.
知识点
Scatter propagation, Skip zone, Ionospheric irregularities, Propagation modes
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.