Discussion
Why is a microwave path checked for clearance at both high and low k values?
Answer: B
At low k the earth bulges and an obstacle may intrude, while at high k the ray flattens and a strong ground reflection can arrive to interfere with the direct signal, so both conditions must be considered. Typical criteria demand full first Fresnel clearance at four thirds and sixty per cent at a low value such as two thirds. Frequency, antenna moves and paperwork are not the reason. A parameter that varies must be checked at both extremes rather than at its average.
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