Problem with SAT HD520 OTA HD signal

[keklimek]

I have the above STB connected to my Hitachi 65SWX20B RPTV via the DVI connectors. Just installed a Winegard Chromstar UHF/VHF antenna in the attic. I am only able to receive a digital signal when I am in the 480P mode. Signal strength is in the lower good range. I have a very good picture in this 480P mode. When I switch to any of the other digital/HDTV modes on the HD520 (1080i, 720p, hybrid or EZ DVI) I lose the digital picture. There is a fluttering with occassional moments of excellent picture strength. This happens with known high definition broadcasts as well as with digital non HD broadcasts. 480P is the only way I can capture any digital signal. Is this all a matter of antenna signal strength? My analog stations come in quite well. I am only 15 miles from the primary transmitters and am using a an attic preamp with an amplifier. This leads to a signal that reads around the g on the good portion of the digital signal strength scale. Any help would be very much appreciated. Thanks.

[kevinw]

Have you tried connecting via component? Sounds like some type of protection scheme preventing anything aboe 480p from being sent to the TV. DVI problem?

[keklimek]

Thanks for the reply. I did connect via components and that has solved my problem. 1080i in all its glory. I still do not understand why I am limited to 480P with the DVI connection. Did I waste $40 on this DVI cable? I have been unable to find a menu item addressing the DVI connection. Thanks again.