I had some time to experiment and load the latest Satdreamgr in flash to check out the atsc epg. I removed the Sundtek usb tuner and deleted the .sh file, but left the control center alone. Then I tried individually, the three Hauppauge driver versions but the image would not recognize the wintv 850 usb tuner.

The only way to get it recognized was to do the opkg install routine. Once recognized, it scanned all the stations and has an epg assigned to some 30% of channels. Some problems still exists for me. Still have to keep using engima restart from the menu in order to activate the usb tuner. Also, when receiver is shut down over night, it needs two or more cold boots to activate the receiver. Then it needs engima restart from the menu to activate the usb tuner.

I'll probably post on the Satdreamgr site too.