Discussion
Why do higher frequency links use shorter hops?
Answer: C
Because the impairments grow rapidly with frequency, a margin that would cover a fifty kilometre hop at six gigahertz covers only a few kilometres at thirty eight. Antenna gain in fact rises with frequency for a fixed aperture, which partly offsets it. Far field distance and regulation are not the constraint. Hop length falling as frequency rises is the practical expression of the whole atmospheric impairment picture, and it shapes the architecture of a network.
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