I have two Hauppauge 2250 tuners in my HTPC, and I've never had any problems with them.
However, after the channel lineup changed, I did a full rescan of the channels just to be safe. The QAM channels didn't change much other than the NASA QAM channel is gone, and it's been replaced with the Univision channel.
I created a spreadsheet of the QAM channels in case I ever needed to redo them:
| Channel Name |
Regular Channel |
Digital Channel |
Hi-Def Channel |
| NBC |
3 |
94.1 |
115.1 |
| FOX |
4 |
94.2 |
116.10 |
| CW |
5 |
94.3 |
117.5 |
| PBS |
8 |
94.5 |
114.3 |
| ABC |
10 |
94.6 |
115.2 |
| CBS |
12 |
94.7 |
114.5 |
| CBS Weather |
12.2 |
114.6 |
|
| MyTV |
6 |
94.9 |
116.3 |
| PBS Explore |
670 |
114.1 |
|
| PBS Create |
671 |
114.4 |
|
|
|
118.15 |
|
| City Channel |
7 |
95.1 |
|
| Univision |
15 |
94.10 |
|
| Azteca America |
312 |
83.4 |
|
Also, channels 122.1 - 122.30 are music channels, though I can only tune into 122.30 for some reason.