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I have two Samsung 19" HDTV's, and the difference between HD and SD is very obvious, even on this size a set. I suspect the tuner in your DVD recorder converts HD to SD, as I know of no DVD recorders that can record in HD off the air (copyright concerns). If you're passing the signal through a VCR on the way to the TV, then it definitely is a SD signal, as no VCR's have the correct inputs to accept or pass through an HD signal.
I have analog cable, and the service converts the HD channels to SD, which I use for my SD sets. For true HD reception, I rely on over the air signals through an antenna for my HDTV's.
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