General exam question G3B07
Subelement G3, RADIO WAVE PROPAGATION· Group G3B
G3B07
What does LUF stand for?
- A.The Lowest Usable Frequency for communications between two specific points (correct answer)
- B.The Lowest Usable Frequency for communications to any point outside a 100-mile radius
- C.The Lowest Usable Frequency during a 24-hour period
- D.The Lowest Usable Frequency during the past 60 minutes
WhyLUF stands for the Lowest Usable Frequency for communications between two specific points. LUF stands for the Lowest Usable Frequency for communication between two specific points, the floor of the usable propagation window for that particular path, answer A. It isn't defined relative to any fixed 100-mile radius, a 24-hour period, or the past 60 minutes, those all describe something other than what LUF actually measures.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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