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Calculator normalises all distances to kilometers and meters
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Miles to Kilometers = 1.609
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Kilometers to miles = 0.621
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feet to meters = .3048
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meters to feet = 3.28
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1st Fresnel Zone radius (Km) = 17.3 x Sqr root ((Obstacle Distance x (Total Link - Obstacle Distance)) / (Frequency in GHz x Total Link))
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1st Fresnel Zone radius (miles) = 72.6 x Sqr root ((Obstacle Distance x (Total Link - Obstacle Distance)) / (Frequency in GHz x Total Link))
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Obstacle free radius = 0.6 x 1st Fresnel Zone radius
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Radius of nth Fresnel zone (meter) = sqr root ( (n x wave length x Obstacle distance x (Total Link - Obstacle Distance)) / Total Link )
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wave length (meters) = speed of light (299,792,458 m/s) / frequency in Hz
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Earth curvature calculation = (Total Link) 2 /(8 * effective earth radius)
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effective earth radius = 4/3 * Earth radius
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Earth radius = 3963 miles, 6378 Km