Thanks for that list, it looks correct to me. I recently converted my Myth HTPC to Windows 7 Media Center (mostly so I can use Xboxes and a Linksys DMA2100 as extenders) and I'm only using clear QAM on that box. I noticed that a lot of channels went away Wed., think it was ABC, NBC, and CBS, and CW. Not good. At first I thought it was a signal level issue but now I see it's the usual Comcast idiocy with PSIP data missing. My HDTV with clear QAM tuner had the same issue, and all of the channels except CW are working this morning.
Surfing around I found this post at thegreenbutton.com
, which although for Vista, would also apply to 7MC as a possible fix for QAM channels with PSIP issues. You basically just add the QAM channels by hand instead of relying on the scan, because the scanned channels apparently rely on PSIP to work. I plan on doing this and we'll see if it corrects the problems with channels disappearing.
FWIW Myth never had a problem with this because it ignores PSIP and tunes the actual freq directly, which I hope this workaround should take care of for 7MC. The only drawback to doing this will be if/when Comcast moves the QAM channel assignments around, which happens every once in a while -the manual add channels won't work then and will have to be re-added with the new freqs (same thing I had to do with Myth once a year or so). However, I've seen PSIP missing way more often so it's probably better to add them by hand then rely on Comcast to provide proper mapping.