Which of the following is an advantage of using a horizontally polarized as compared to a vertically polarized HF antenna?
The correct answer is A: Lower ground losses. An advantage of using a horizontally polarized as compared to a vertically polarized HF antenna is lower ground losses. Horizontal antennas have less interaction with ground, reducing ground losses compared to verticals. For amateur radio operators, this is why horizontal antennas are often preferred. Understanding this helps when selecting antennas.
Exam Tip
Horizontal vs vertical advantage = lower ground losses. Think 'H'orizontal = 'H'igher above ground = 'L'ower ground losses. Horizontal antennas have less interaction with ground, reducing ground losses. Not lower impedance, not shorter radials, not lower radiation resistance - just lower ground losses.
Memory Aid
"Horizontal vs vertical advantage = lower ground losses. Think 'H'orizontal = 'L'ower ground losses. Horizontal antennas have less interaction with ground, reducing ground losses. Key advantage of horizontal polarization."
Real-World Application
A horizontal dipole vs a vertical antenna: The horizontal antenna has less interaction with the ground (it's typically higher), resulting in lower ground losses. Vertical antennas interact more with the ground, causing higher ground losses. Lower ground losses is a key advantage of horizontal polarization on HF.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Horizontal doesn't have lower feed point impedance - both can have similar impedances. Feed point impedance isn't the advantage.
Option C: Incorrect. Horizontal doesn't have shorter radials - radials are for verticals, not horizontals. Radials aren't relevant.
Option D: Incorrect. Horizontal doesn't have lower radiation resistance - both can have similar radiation resistance. Radiation resistance isn't the advantage.
题目解析
The correct answer is A: Lower ground losses. An advantage of using a horizontally polarized as compared to a vertically polarized HF antenna is lower ground losses. Horizontal antennas have less interaction with ground, reducing ground losses compared to verticals. For amateur radio operators, this is why horizontal antennas are often preferred. Understanding this helps when selecting antennas.
考试技巧
Horizontal vs vertical advantage = lower ground losses. Think 'H'orizontal = 'H'igher above ground = 'L'ower ground losses. Horizontal antennas have less interaction with ground, reducing ground losses. Not lower impedance, not shorter radials, not lower radiation resistance - just lower ground losses.
记忆口诀
Horizontal vs vertical advantage = lower ground losses. Think 'H'orizontal = 'L'ower ground losses. Horizontal antennas have less interaction with ground, reducing ground losses. Key advantage of horizontal polarization.
实际应用示例
A horizontal dipole vs a vertical antenna: The horizontal antenna has less interaction with the ground (it's typically higher), resulting in lower ground losses. Vertical antennas interact more with the ground, causing higher ground losses. Lower ground losses is a key advantage of horizontal polarization on HF.
错误选项分析
Option B: Incorrect. Horizontal doesn't have lower feed point impedance - both can have similar impedances. Feed point impedance isn't the advantage. Option C: Incorrect. Horizontal doesn't have shorter radials - radials are for verticals, not horizontals. Radials aren't relevant. Option D: Incorrect. Horizontal doesn't have lower radiation resistance - both can have similar radiation resistance. Radiation resistance isn't the advantage.
知识点
Horizontal polarization, Vertical polarization, Lower ground losses, Ground interaction
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.