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G3B11
What happens to HF propagation when the LUF exceeds the MUF?
Pick an answer to check it.
Answer: A. Propagation via ordinary skywave communications is not possible over that path
If the lowest usable frequency is higher than the maximum usable frequency, there is no frequency that works on that path. Ordinary skywave communication is not possible.
Tip: LUF above MUF: no window.