I have a 5-mile link that experiences occasional several hour periods of 90% plus packet loss. Is there any reason not to set up two parabolic dish antennas, one 3 inches closer to the other end of the link, and configure the radio for diversity? The hope is that this would reduce multipath problems.
It would reduce multipath if multipath is the problem but you might be dealing with refraction or you might be on the edge of the fresnel zone. When it happens, try raising your antenna to move it out of the fresnel zone.
I was doing some work with Sprint's MMDS system down in LA. They had acquired a MMDS licensee down there who had collected huge amounts of propagation data over an 80mi path south from Mount Wilson. I was amazed to see that, over the path which was totally in the clear, they experienced up to 20db of signal reinforcement and 40db of loss relative to the link path loss calculations. That is 60 db of signal variation over a clear LOS path. They even correlated the path variations with weather and thermal inversions. Very cool.
Oh, their solution? They placed another 8' dish about 50' down on the tower and then put in a voter that selected the better signal. Problem solved.
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Brian Lloyd 6501 Red Hook Plaza, Suite 201 [EMAIL PROTECTED] St. Thomas, VI 00802 +1.340.998.9447 - voice +1.360.838.9669 - fax GMT-4
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