Discussion
Why does frequency diversity not help against rain attenuation?
Answer: B
Attenuation by rain varies slowly with frequency, so two carriers a few per cent apart fade together and no independence exists to exploit. Route diversity, with a second path outside the rain cell, is the effective answer where availability demands it. Rain does depolarise but affects both polarisations, fades last minutes rather than milliseconds, and the antenna match is unaffected. Choosing a diversity dimension in which the impairment is actually independent is the whole art of applying the technique.
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