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

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# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
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