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On Tue, 16 Sep 2008 17:25:35 -0700, John Smith
wrote: IMHO, and humble experience, reflections only worsen with a raise in frequency ... others mileage may vary ... and EVERYTHING you own, which is metal/conductive, is a wavelength+ at Ghz! If the US had gone with the DVB-T COFDM standard, instead of the ATSC 8VSB standard, we would have much better immunity to reflections. OFDM is fairly immune to reflections, which appears as frequency selective fading. If a few carriers end up cancelling with a reflection, then COFDM still has 1700 or more carriers that continue to pass data. With FEC, most of the data gets through. Something like this: http://www.navtechsystems.co.uk/services/micro_links/cofdm_dig_theory.html -- # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060 # 831-336-2558 # http://802.11junk.com # http://www.LearnByDestroying.com AE6KS |
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