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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: ftth who wrote (4649)7/17/1999 11:32:00 PM
From: wonk  Read Replies (2) of 12823
 
Dave, Frank, all:

Regarding the following:

...A fade margin of 15 dB or more is sufficient for reliable transmission at one-half-mile range in heavy rainfall up to 3 inches per hour, in wet snowfall up to 2 inches per hour, and in dry snowfall up to 1 inch per hour. It is also sufficient to penetrate fog at a distance of approximately 110 percent of the actual visibility....

Not knowing laser transmission, I have been looking - and have been unsuccessful - for any authoritative source (IEEE etc) which quantifies attenuation due to precipitation, at various levels of point rain rate, and other atmospherics effects in dB per kilometer.

Anyone have a reference source or link?

Thanks

ww
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