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Old June 1st 09, 10:27 PM posted to rec.radio.amateur.antenna,rec.radio.amateur.homebrew,alt.tv.tech.hdtv
Paul Keinanen Paul Keinanen is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 85
Default "Panel" style UHF DTV antenna?

On Mon, 01 Jun 2009 06:49:20 -0500, Cecil Moore
wrote:

Gordon wrote:
Well, I got an improvement, probably in spite of myself. The
setup gives better signal strength, and is less suseptable to
interfearence (people walking aroung the room) than just a
single bowtie.


A mismatch can cause ghosting in an analog TV.
What does ghosting do to a digital TV signal?


In countries using COFDM (DVB-T), the symbol time is about 1000 us
(8k) or 250 us (2k), so in the worst case with minimal guard
intervals, you can still use mismatched coaxial cables longer than 1
km without problems :-).

With ATSC 8VSB it depends how well the equalizer is capable of
detecting the characteristics of the radio and coaxial path with a
known signal pattern.

Paul OH3LWR