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On 10 Sep 2011 18:27:58 GMT, dave wrote:
Cell sites are a different animal . We were talking about 2-way, point-to-point, VHF/UHF broadcast type sites. Perhaps you didn't notice but several of the examples of PIM and rotten coax induced intermod were for non-cellular systems. The problems are much the same with any service type. If you have moderate TX power, magnetic materials in the connectors, and sensitive receivers, PIM might be a concern. Also, it may not be obvious unless you've worked on a cell site, but the state-o-de-art in radio is currently defined by cellular. The current generation of cellular radios, pre-distorting power amps, tower mounted amps, cryogenic front ends, steerable antennas, channel loading, codecs, and environmental protections, are far superior to what I've seen in commercial radio, and light years ahead of the 3rd hand garbage commonly found in ham repeaters. Yes, cellular is different, but it's also quite superior. If the cellular people think they have a PIM problem, it's probably quite real. Unfortunately, cellular can't always get everything right: http://802.11junk.com/jeffl/SCCARC-talk-2010-06-18/Burning-Towers.htm http://www.cellsiteanalysis.net/cell_site_analysis_images/Cell_Site_Mast_Loaded.jpg YouTube is pretty intense. Duz that mean that you still haven't watched the video clip? -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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