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Originally Posted by old_tv_nut
I don't beleive anyone is doing a 1080i sub on top of a 1080i main - what you are probably seeing is the same as what WGN (WB channel in Chicago) is doing - two program table entries for the same video, perhaps with Spanish audio on the second entry when available.
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Los Angeles channel 5 WB (KTLA) does the same thing, I was told this does not use any more bandwidth than one main channel since it's the same data. It's an excellent digital channel out here, they zoom in on almost everything fully or nearly fully so not much in the way of annoying black or grey side bars, only channel in LA that does that. They really do a good job at it too as I never seem to notice stuff getting chopped off vertically, maybe they zoom a little and stretch a little, but it looks great. Don't know if it's WB doing it or KTLA.