Looking to perhaps setup a bridge between 2 buildings. Have successfully setup a 10Mbps bridge between corporate and a sales office about a half-mile away, so I have a little experience. BUT, looking to link another site with corporate HQ. This building is roughly 10 miles away and I am thinking about using Proxim TeraBridge 5845 which can supposedly go to ~40 miles. But, how do I ascertain LOS existence? From up on the roof I think I could probably see the other building, but what type of equipment (without spending 10 grand on the final product) cna I use to deduce LOS quality? Anyone done something similiar ot this?
Bridge buildings ~10 miles apart
Mar 06, 2006
2 Replies
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how to do link calculations. Run the numbers and don't believe the 40 miles claims.
I use a program called Topo! for doing path profiles. Find the
*EXACT* latitude, longitude, and probable antenna height above the ground. I just print the path profile, which shows all the intervening hills, mark points at both ends of the path for the radios, and draw a straight line. If you hit the ground or any hills, it won't work.
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A better way is to use Radio Mobile for the path calcs:
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the 2nd photo (labelled link):
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sure to use the SRTM data and not the DEM data. When I have time, or want an exact calculation, I use this method.
At 10 miles, the Fresnel Zone at 5.7GHz will be 48ft around the line of sight at midpoint. You'll need about 38ft clearance to all obstructions including the ground. Also, don't foget about the curvature of the earth.
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There are a number of excellent calculators at:
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Also:
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If you're stuck, yell.
Thanks so much for the thorough reply....
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