What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?
The correct answer is D: 12,000 miles, if the moon is 'visible' by both stations. What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME is 12,000 miles, if the moon is 'visible' by both stations. EME can cover up to about 12,000 miles when both stations can see the moon. For amateur radio operators, this is important for EME operation. Understanding this helps when planning EME contacts.
Exam Tip
EME maximum separation = 12,000 miles if moon visible by both stations. Think 'E'ME 'M'aximum = '1'2,000 miles. EME can cover up to about 12,000 miles when both stations can see the moon. Not 2,000 miles, not 5,000 miles - just 12,000 miles.
Memory Aid
"EME maximum separation = 12,000 miles if moon visible by both stations. Think 'E'ME 'M'aximum = '1'2,000 miles. EME can cover up to about 12,000 miles when both stations can see the moon. Important for EME operation."
Real-World Application
EME (Earth-Moon-Earth) communication: The approximate maximum separation between two stations is 12,000 miles, if the moon is 'visible' by both stations. This is roughly half the Earth's circumference. When both stations can see the moon, they can communicate via EME. This is the maximum separation - 12,000 miles.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 2,000 miles at perigee is too short - EME can cover up to about 12,000 miles. 2,000 miles is too short.
Option B: Incorrect. 2,000 miles at apogee is too short - EME can cover up to about 12,000 miles. 2,000 miles is too short.
Option C: Incorrect. 5,000 miles at perigee is too short - EME can cover up to about 12,000 miles. 5,000 miles is too short.
题目解析
The correct answer is D: 12,000 miles, if the moon is 'visible' by both stations. What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME is 12,000 miles, if the moon is 'visible' by both stations. EME can cover up to about 12,000 miles when both stations can see the moon. For amateur radio operators, this is important for EME operation. Understanding this helps when planning EME contacts.
考试技巧
EME maximum separation = 12,000 miles if moon visible by both stations. Think 'E'ME 'M'aximum = '1'2,000 miles. EME can cover up to about 12,000 miles when both stations can see the moon. Not 2,000 miles, not 5,000 miles - just 12,000 miles.
记忆口诀
EME maximum separation = 12,000 miles if moon visible by both stations. Think 'E'ME 'M'aximum = '1'2,000 miles. EME can cover up to about 12,000 miles when both stations can see the moon. Important for EME operation.
实际应用示例
EME (Earth-Moon-Earth) communication: The approximate maximum separation between two stations is 12,000 miles, if the moon is 'visible' by both stations. This is roughly half the Earth's circumference. When both stations can see the moon, they can communicate via EME. This is the maximum separation - 12,000 miles.
错误选项分析
Option A: Incorrect. 2,000 miles at perigee is too short - EME can cover up to about 12,000 miles. 2,000 miles is too short. Option B: Incorrect. 2,000 miles at apogee is too short - EME can cover up to about 12,000 miles. 2,000 miles is too short. Option C: Incorrect. 5,000 miles at perigee is too short - EME can cover up to about 12,000 miles. 5,000 miles is too short.
知识点
EME, Maximum separation, 12,000 miles, Moon visible
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.