When scheduling EME contacts, which of these conditions will generally result in the least path loss?
The correct answer is A: When the Moon is at perigee. When scheduling EME contacts, which of these conditions will generally result in the least path loss is when the Moon is at perigee. Perigee is when the moon is closest to Earth, resulting in less path loss. For amateur radio operators, this is important for EME operation. Understanding this helps when scheduling EME contacts.
Exam Tip
EME least path loss = when Moon is at perigee. Think 'E'ME 'L'east 'L'oss = 'E'arth 'L'osest to moon (perigee). Perigee is when the moon is closest to Earth, resulting in less path loss. Not full moon, not apogee, not MUF - just perigee.
Memory Aid
"EME least path loss = when Moon is at perigee. Think 'E'ME 'L'east 'L'oss = 'P'erigee. Perigee is when the moon is closest to Earth, resulting in less path loss. Important for EME operation."
Real-World Application
Scheduling EME contacts: When the Moon is at perigee (closest to Earth), the path loss is least because the distance is shortest. At apogee (farthest from Earth), path loss is greater. This is why EME operators prefer to schedule contacts when the moon is at perigee. This is the condition - moon at perigee results in least path loss.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. When the Moon is full doesn't minimize path loss - perigee (closest distance) minimizes path loss. Full moon isn't the condition.
Option C: Incorrect. When the Moon is at apogee increases path loss - perigee minimizes path loss. Apogee is wrong.
Option D: Incorrect. When MUF is above 30 MHz doesn't affect EME path loss - moon distance affects path loss. MUF isn't the factor.
题目解析
The correct answer is A: When the Moon is at perigee. When scheduling EME contacts, which of these conditions will generally result in the least path loss is when the Moon is at perigee. Perigee is when the moon is closest to Earth, resulting in less path loss. For amateur radio operators, this is important for EME operation. Understanding this helps when scheduling EME contacts.
考试技巧
EME least path loss = when Moon is at perigee. Think 'E'ME 'L'east 'L'oss = 'E'arth 'L'osest to moon (perigee). Perigee is when the moon is closest to Earth, resulting in less path loss. Not full moon, not apogee, not MUF - just perigee.
记忆口诀
EME least path loss = when Moon is at perigee. Think 'E'ME 'L'east 'L'oss = 'P'erigee. Perigee is when the moon is closest to Earth, resulting in less path loss. Important for EME operation.
实际应用示例
Scheduling EME contacts: When the Moon is at perigee (closest to Earth), the path loss is least because the distance is shortest. At apogee (farthest from Earth), path loss is greater. This is why EME operators prefer to schedule contacts when the moon is at perigee. This is the condition - moon at perigee results in least path loss.
错误选项分析
Option B: Incorrect. When the Moon is full doesn't minimize path loss - perigee (closest distance) minimizes path loss. Full moon isn't the condition. Option C: Incorrect. When the Moon is at apogee increases path loss - perigee minimizes path loss. Apogee is wrong. Option D: Incorrect. When MUF is above 30 MHz doesn't affect EME path loss - moon distance affects path loss. MUF isn't the factor.
知识点
EME contacts, Least path loss, Moon at perigee, Path loss
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.