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#1
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Floyd Davidson wrote:
"And darned if a few years later a build up of rhime ice on the 43 feet of tower above the dish didn`t fall down and bend that dish into a pile of rubble too," By Floyd`s logic the lesson must be that a dish must always top the tower, out of harms way. The antenna does not have to receive zero interference, though that would be nice. We are always susceptible to some interference from somewhere at some time. Multiphop systems often must reuse just a few frequency pairs over and over. It`s all the regulators will allow. Situations arise when anomalous propagation provides strong signals at extraordinary distances. Planning includes avoiding azimuths which would repeat to present interference at a great distance along with a repetition of a frequency which might interfere. A solution to interference is coordination. Another is often high performance dishes which do a better job of rejection. I`ve used the shielded variety from Antennas For Communications (AFC) with good success. Ice may be falling, but the sky isn`t in the case of microwave interference. Best regards, Richard Harrison, KB5WZI |
#3
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Floyd Davidson wrote:
"The only sky falling is your claim that you calculate path losses to within 1 dB for every single microwave shot." I wrote many boring postings ago: "---my best received carrier power was very nearly always within a db of my calculations." That was very nearly, not every single microwave shot. That was during normal propagation conditions, not during fades. It was and is a true statement. Such results can be achieved by anyone who plans the system correctly using the required accurate information. Best regards, Richard Harrison, KB5WZI |
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