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Of course, the quick way to get unpuzzled is to look at a baseband video output with a scope.
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Bear with me while I ask a stupid question: by baseband, do you mean the video signal coming directly from the cable box?
Here's the video signal from a high channel (521) showing a dark letterboxed vampire movie.
Here's the video signal (nothing changed on scope) from a low channel (4) showing the Wheel of Fortune stage full-screen.
They sure look different, but I'm at a loss how to interpret . . . .
Phil Nelson