Discussion
Why is ducting a nuisance for frequency planners?
Answer: A
Because a duct occasionally carries a signal hundreds of kilometres, a frequency assignment that is safe on ordinary days can suffer severe interference for hours at a time, and the statistics of its occurrence must be built into planning criteria. Coverage within the duct is if anything enhanced, polarisation is preserved, and reception is not prevented. A rare but severe condition is harder to plan for than a common mild one, which is why propagation statistics are expressed as percentages of time.
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