I just upgraded my HTPC setup by adding a HDHomerun, I'm very satisfied with it but I've noticed over the last week an issue with clearQAM scanning in MediaPortal. When I use the included software to scan my cable setup I get 180 clearQAM channels that I can view with VLC media player, but when I scan with MediaPortal for setting up the channels I see, I only get 68 channels. I've tried multiple configurations of placing the tuner direct to the cable input in my home, and such trying to ascertain if MediaPortal scan engine is more sensitive than the manufacturer's client. I've also looked at the HDhomerun channel scan xml file produced by manufacture's software, and I can't figure out how to map it to MediaPortal XML syntax. I've attached my TVServer logs for MediaPortal, plus the channel scan with MediaPortal (MP_HDHomeRun_Scan.xml) and the scan results from the manufacturer's software (HDHomeRun_Scan.xml).
In trying to figure things out, and find a solution myself, I noticed that the frequencies in the XMl file generated from the manufacturer's software didn't match the QAM frequencies listed in the QAM_Standard.qam TuningParameters file, I then tried taking the XML file from the scan done with the software from the HDHomeRun manufacturer and then extracting the frequencies, then filtering the list to unique values (as there may be multiple channels on a single frequency), then truncating the frequencies to be in the thousands (dividing by 1000 to match the syntax of the other QAM definition files) to create a custom QAM tuning setup to store into C:\Program Files\Team MediaPortal\MediaPortal TV Server\TuningParameters. Then I re-ran the tuning setup in TVServer. This, however, did not produce any results either. (I've attached the custom QAM file below, but I had to add a .txt to the .qam suffix for the system to accept it as a valid file to upload).
I've also tried tinkering with values found in General Settings->Scan for the TVServer too with no luck. I've tried cutting these values to 1, and extending them all to 30 with neither action resulting in any additional channels found.
I've had this problem with clean installs of 1.0RC1 (no svn), and with SVN builds 19311, and 19376 (admittedly, I haven't tried the rest of the earlier SVNs).
For what it's worth I've had similar issues with my Hauppauge HVR-1600 too, my intuition is that the problem is the same (or VERY closely related) for both QAM tuners.
Any ideas on how to fix this?

-Rob
TV-Server Version: 1.0 RC + SVN
MediaPortal Version: 1.0 RC + SVN
MediaPortal Skin: Blue Two
Windows Version: XP SP2
CPU Type: Intel P4 2.26Ghz
HDD: 2 80GB IDE
Memory: 2GB
Motherboard: Biostar U-866D
Video Card: Diamond Stealth AGP 256MB
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: HVR-1600
1. TV Card Type: Analog/ATSC/QAM
1. TV Card Driver: Latest BDA drivers from mfg. website
2. TV Card: HDHomeRun
2. TV Card Type: ATSC/QAM
2. TV Card Driver: 20080430 (latest BDA drivers from mfg. website)
MPEG2 Video Codec: FFDShow
MPEG2 Audio Codec: FFDShow
h.264 Video Codec: FFDShow
CableTV Provider: Sunflower Broadband (Lawrence, Kansas)
HTPC Case: In the market for a new one
Cooling:
Power Supply:
Remote: Hauppauge 45 Button
TV: 27" 4:3 aspect ratio SDTV
TV - HTPC Connection: S-Video
In trying to figure things out, and find a solution myself, I noticed that the frequencies in the XMl file generated from the manufacturer's software didn't match the QAM frequencies listed in the QAM_Standard.qam TuningParameters file, I then tried taking the XML file from the scan done with the software from the HDHomeRun manufacturer and then extracting the frequencies, then filtering the list to unique values (as there may be multiple channels on a single frequency), then truncating the frequencies to be in the thousands (dividing by 1000 to match the syntax of the other QAM definition files) to create a custom QAM tuning setup to store into C:\Program Files\Team MediaPortal\MediaPortal TV Server\TuningParameters. Then I re-ran the tuning setup in TVServer. This, however, did not produce any results either. (I've attached the custom QAM file below, but I had to add a .txt to the .qam suffix for the system to accept it as a valid file to upload).
I've also tried tinkering with values found in General Settings->Scan for the TVServer too with no luck. I've tried cutting these values to 1, and extending them all to 30 with neither action resulting in any additional channels found.
I've had this problem with clean installs of 1.0RC1 (no svn), and with SVN builds 19311, and 19376 (admittedly, I haven't tried the rest of the earlier SVNs).
For what it's worth I've had similar issues with my Hauppauge HVR-1600 too, my intuition is that the problem is the same (or VERY closely related) for both QAM tuners.
Any ideas on how to fix this?
-Rob
TV-Server Version: 1.0 RC + SVN
MediaPortal Version: 1.0 RC + SVN
MediaPortal Skin: Blue Two
Windows Version: XP SP2
CPU Type: Intel P4 2.26Ghz
HDD: 2 80GB IDE
Memory: 2GB
Motherboard: Biostar U-866D
Video Card: Diamond Stealth AGP 256MB
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: HVR-1600
1. TV Card Type: Analog/ATSC/QAM
1. TV Card Driver: Latest BDA drivers from mfg. website
2. TV Card: HDHomeRun
2. TV Card Type: ATSC/QAM
2. TV Card Driver: 20080430 (latest BDA drivers from mfg. website)
MPEG2 Video Codec: FFDShow
MPEG2 Audio Codec: FFDShow
h.264 Video Codec: FFDShow
CableTV Provider: Sunflower Broadband (Lawrence, Kansas)
HTPC Case: In the market for a new one
Cooling:
Power Supply:
Remote: Hauppauge 45 Button
TV: 27" 4:3 aspect ratio SDTV
TV - HTPC Connection: S-Video