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Floyd Davidson wrote:
"---I`ll bet you just exagerated a little, that`s all." Too many hours of daylight on Floyd are taking their toll. Everything you work with is known. precisely, including path attenuation under normal propagation conditions. Normally, you don`t have a path grazing at a highly reflective point. Your path survey discloses path detractions and you adjust for the possibility of distructive interference. You may opt for a high / low antenna placement for the path ends, diversity, more clearance, shorter paths, and brute-force fade margins. The high / low option lets you move the reflection point and the reflection. Long microwave systems must have huge fade margins anyway due to noise buildup from individual path contributions. A receiver not too much below the overload signal point is a very quiet receiver and contributes almost no noise to a system. When the path design is right, the as-built numbers are almost exactly as calculated, whether you believe it or not. Best regards, Richard Harrison, KB5WZI |
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