One minute the "Digital TV Signal Strength" option under Tasks->Settings->TV was there and then poof it was gone and I can't for the life of me bring it back. According to the Avermedia instructions for their ClearQAM beta drivers and tool, I need to run this utility in media center before running their QAM tool.

I'm running Vista Home Premium, AverMedia Combo PCI-E tuner card. I've tried just about everything, and yet to no avail. I'm on the verge of scrapping everything and starting over, which would be very inconvenient and time consuming. I thought I'd throw this out to the experts before I go to plan Z. Any help would be appreciated!

Not 100% sure but I think thats only for ATSC.

Count me as one of the people who can't find this.  One moment I'm trying to add a channel back to my lineup for my HDHR and after a reboot I have no clear QAM in media center.  Running the TV Signal setup and it finds no Digital Antenna and no option to check the signal strength. 

I can see the QAM channels in VLC and through the HDHR setup software.  For some reason, I can't get VMC to see that I have a digital antenna at all.

Anyone? 

I ran into the same issue. Apparently you need to disconnect your CableCARD tuners, then run the TV signal setup. The option to manually configure your signal will only appear after disconnecting the digital tuners.

Looks like after disconnecting my CableCARD tuners I was able to add the HDHR QAM channels. However, when I try to run the TV signal setup again for the CableCARD tuners it forces me into auto detection mode and only finds and sets up the CableCARD tuners (removing the HDHR channels). I see all 4 tuners in the registry. Right now I can only do either CableCARD or HDHR, but not both. Anyone have any ideas?

I've even re-imaged back to before I started the Media Center setup, so everything was clean. I then tried adding the HDHR tuners first, then the CableCARD tuners, but I can still only get either and not both.

Interesting.  I'm wondering how this has broken for a few of us.  I am hesitant to unplug my OCUR tuners, since they have worked perfectly and I'm paranoid by messing with them I will get an error message.  

Thanks Richard. Yes you are correct it is for ATSC only, but that's what I'm trying to do. The card I have has both NTSC/Analog and ATSC/Digital/QAM inputs. I don't know how it's possible that an option just disappeared from Media Center. I wonder if I got some Windows update that wiped it out?

MS doens't seem to know anything about it as it relates to Vista, though they had the problem in MCE 2005 for XP and had fixes for it.

You're not alone. The same thing happened to me today. I have an Hauppauge HVR-1600 PCI card and HVR-950 USB stick, and "Digital TV Signal Strength" disappeared today. In addition, ATSC no longer works; running setup again, it finds no digital tuners. The only thing that does work is my set top box over S-Video on the HVR-1600. I did uninstall the SageTV trial right before this occurred, and I also uninstalled an Auzentech Prelude and installed a Creative X-Fi Titanium PCIe card. I tried deleting the tuners from Device Manager, rebooting, and running Media Center setup again, but no joy. Open to ideas!

tims029334:

You're not alone. The same thing happened to me today. I have an Hauppauge HVR-1600 PCI card and HVR-950 USB stick, and "Digital TV Signal Strength" disappeared today. In addition, ATSC no longer works; running setup again, it finds no digital tuners. The only thing that does work is my set top box over S-Video on the HVR-1600. I did uninstall the SageTV trial right before this occurred, and I also uninstalled an Auzentech Prelude and installed a Creative X-Fi Titanium PCIe card. I tried deleting the tuners from Device Manager, rebooting, and running Media Center setup again, but no joy. Open to ideas!

I managed to get the TV Strength option back by changing the DWORD value "atsc" from 0 to 1 under this registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Service\EPG

No luck yet getting VMC to recognize my digital tuners that it formerly recognized. The tuners aren't broken, because they work in another copy of Vista (primary one, actually) that I dual boot with. Fortunately, it was only my "gamer" copy (also guinea pig) that got hosed.