I have a similar problem.
Have already built a simple HTPC containing the Hauppage 2250 tuner.
One of the purposes was to be able to record HD shows. Was also planning
purchasing a CableCard from Comcast but what I observed so far got me
confused. Perhaps someone can help me out.
I have Comcast cable service and Motorolla DCX3200 Digital STB. The box has
all kind of outputs, HDMI, composite, components, S-video. I can use S-
video STB output to feed 2250 tuner to watch/record any channel in my
subscription package, but of course, all of them will be in SD (standard
definition) only. However, I reasoned, once I get the Comcast cablecard I should be
able to feed 2250 tuner directly by connecting the the cable to the
antenna/cable input on the 2250. Also, I do not need Comcast cable Card
to watch unencrypted (clear Qam) HD channels. And so in my Windows XP
version of the HTPC I see all these ABC, CBS, and the like. My Win XP
didn't come with WMC and I used Hauupage Win7 app but didn't like it.
Had other problems with XP and decided to reload the HTPC with 64-bit
Hoime Premium Win7. I like Win7 WMC, sort of, but it doesn't find almost
no digital channels. Actually, when it scans for available channels, it
does find all the unencrypted ones, but once it finished scanning, it
reports just one, MeToo. I tried manually to add an HD channel but Wmc
said there's no signal in that channel, while I actually could hear the
audio of that channel but no video.
So it seems adding a comcast CableCard wouldn't do me any good, until I
solve my problem with unencrypted channels.
I will be greatfull for any ideas.