What does MUF stand for?
The correct answer is B: The Maximum Usable Frequency for communications between two points. MUF stands for the Maximum Usable Frequency for communications between two points. MUF is the highest frequency that can successfully propagate between two locations. For amateur radio operators, MUF helps determine the highest frequency that will work for a specific path. Understanding this helps when selecting operating frequencies.
Exam Tip
MUF = Maximum Usable Frequency for communications between two points. Think 'M'UF = 'M'aximum 'U'sable 'F'requency. Highest frequency that can successfully propagate between two locations. Not minimum, not 24-hour period, not past 60 minutes - just two points.
Memory Aid
"MUF = Maximum Usable Frequency for communications between two points. Think 'M'UF = 'M'aximum 'U'sable 'F'requency. Highest frequency that can successfully propagate between two locations. Path-specific value."
Real-World Application
MUF for a path from New York to London is 21 MHz. This means 21 MHz is the highest frequency that can successfully propagate between these two points. Frequencies above 21 MHz won't work for this path - they'll pass through the ionosphere. MUF is specific to the path and current conditions.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. MUF isn't Minimum Usable Frequency - it's Maximum. LUF is the minimum, MUF is the maximum.
Option C: Incorrect. MUF isn't for a 24-hour period - it varies with time of day. MUF is a current value, not a 24-hour average.
Option D: Incorrect. MUF isn't for the past 60 minutes - it's a current value for a specific path, not a historical average.
题目解析
The correct answer is B: The Maximum Usable Frequency for communications between two points. MUF stands for the Maximum Usable Frequency for communications between two points. MUF is the highest frequency that can successfully propagate between two locations. For amateur radio operators, MUF helps determine the highest frequency that will work for a specific path. Understanding this helps when selecting operating frequencies.
考试技巧
MUF = Maximum Usable Frequency for communications between two points. Think 'M'UF = 'M'aximum 'U'sable 'F'requency. Highest frequency that can successfully propagate between two locations. Not minimum, not 24-hour period, not past 60 minutes - just two points.
记忆口诀
MUF = Maximum Usable Frequency for communications between two points. Think 'M'UF = 'M'aximum 'U'sable 'F'requency. Highest frequency that can successfully propagate between two locations. Path-specific value.
实际应用示例
MUF for a path from New York to London is 21 MHz. This means 21 MHz is the highest frequency that can successfully propagate between these two points. Frequencies above 21 MHz won't work for this path - they'll pass through the ionosphere. MUF is specific to the path and current conditions.
错误选项分析
Option A: Incorrect. MUF isn't Minimum Usable Frequency - it's Maximum. LUF is the minimum, MUF is the maximum. Option C: Incorrect. MUF isn't for a 24-hour period - it varies with time of day. MUF is a current value, not a 24-hour average. Option D: Incorrect. MUF isn't for the past 60 minutes - it's a current value for a specific path, not a historical average.
知识点
MUF, Maximum Usable Frequency, Two points, Path-specific
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.