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On Mon, 19 Jan 2004 19:06:06 GMT, Gary Schafer
wrote: .... Here is a path loss calculator. It uses 20 miles as a default for the range. You can put in some heights and note the amount of path loss in DB that you get. Then double the height of one of the antennas and note that the path loss you get decreases by 6 db. http://www.decibelproducts.com/Calculators/qegli.htm Regards Gary This caculator gives the following caution: "Note: The Egli model is based on data measured over radials mainly in the eastern US seaboard and central plains states. It gives an overall propagation loss over gently rolling terrain with average hill heights of approximately 50 ft. " You may have noticed that at sea, you hope to avoid regions with gentle hillocks of 50 ft wave height. :-) Brian W |
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