How does the VHF/UHF radio horizon compare to the geographic horizon?
The correct answer is A: It is approximately 15 percent farther. How does the VHF/UHF radio horizon compare to the geographic horizon is that it is approximately 15 percent farther. Radio waves bend slightly due to atmospheric refraction, extending the radio horizon. For amateur radio operators, this is important for VHF/UHF operation. Understanding this helps when planning VHF/UHF contacts.
Exam Tip
VHF/UHF radio horizon vs geographic = approximately 15 percent farther. Think 'R'adio 'H'orizon = 'R'efraction 'H'elps (15% farther). Radio waves bend slightly due to atmospheric refraction, extending the radio horizon. Not nearer, not 50%, not same - just 15% farther.
Memory Aid
"VHF/UHF radio horizon vs geographic = approximately 15 percent farther. Think 'R'adio 'H'orizon = '1'5% farther. Radio waves bend slightly due to atmospheric refraction, extending the radio horizon. Important for VHF/UHF operation."
Real-World Application
VHF/UHF radio horizon: It's approximately 15 percent farther than the geographic horizon. This is because atmospheric refraction bends radio waves slightly downward, extending the effective horizon. For example, if geographic horizon is 10 miles, radio horizon is about 11.5 miles. This is the comparison - radio horizon is 15% farther.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. 20 percent nearer isn't correct - radio horizon is farther, not nearer. Nearer is wrong.
Option C: Incorrect. 50 percent farther is too much - radio horizon is about 15 percent farther. 50 percent is too high.
Option D: Incorrect. They're not approximately the same - radio horizon is about 15 percent farther. Same is wrong.
题目解析
The correct answer is A: It is approximately 15 percent farther. How does the VHF/UHF radio horizon compare to the geographic horizon is that it is approximately 15 percent farther. Radio waves bend slightly due to atmospheric refraction, extending the radio horizon. For amateur radio operators, this is important for VHF/UHF operation. Understanding this helps when planning VHF/UHF contacts.
考试技巧
VHF/UHF radio horizon vs geographic = approximately 15 percent farther. Think 'R'adio 'H'orizon = 'R'efraction 'H'elps (15% farther). Radio waves bend slightly due to atmospheric refraction, extending the radio horizon. Not nearer, not 50%, not same - just 15% farther.
记忆口诀
VHF/UHF radio horizon vs geographic = approximately 15 percent farther. Think 'R'adio 'H'orizon = '1'5% farther. Radio waves bend slightly due to atmospheric refraction, extending the radio horizon. Important for VHF/UHF operation.
实际应用示例
VHF/UHF radio horizon: It's approximately 15 percent farther than the geographic horizon. This is because atmospheric refraction bends radio waves slightly downward, extending the effective horizon. For example, if geographic horizon is 10 miles, radio horizon is about 11.5 miles. This is the comparison - radio horizon is 15% farther.
错误选项分析
Option B: Incorrect. 20 percent nearer isn't correct - radio horizon is farther, not nearer. Nearer is wrong. Option C: Incorrect. 50 percent farther is too much - radio horizon is about 15 percent farther. 50 percent is too high. Option D: Incorrect. They're not approximately the same - radio horizon is about 15 percent farther. Same is wrong.
知识点
VHF/UHF radio horizon, Geographic horizon, 15 percent farther, Atmospheric refraction
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.