Question
What does LUF stand for?
Answer Options
- A) The Lowest Usable Frequency for communications between two specific points
- B) Lowest Usable Frequency for communications to any point outside a 100-mile radius
- C) The Lowest Usable Frequency during a 24-hour period
- D) Lowest Usable Frequency during the past 60 minutes
Correct Answer: A
Explanation
LUF is the acronym for Lowest Usable Frequency. It represents the lowest frequency at which ionospheric absorption permits a signal strong enough for communication between two specific points.
Unlike the MUF, which is limited by refraction, the LUF is limited by absorption, primarily in the D-region, which changes depending on the ionization level. Both the LUF and MUF are specific to a particular path, time, and date, meaning the LUF for a path from New York to London will be different from the LUF for a path from New York to California.
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