I have an Onkyo 806 which isn't 3D compatible. Someone correct me if I'm wrong, but I think framepacked 3D won't pass through the receiver, but side by side content will. When I go to the 3D channels I have, I get two side by side images, then I manually change the 3D to side by side on my projector and it works. So perhaps your DTV 3D channels are frame packed. And yes, my satellite is hooked up via hdmi through my non-3D ready receiver. Hope that helps. Worst case scenario is you hook up the dvr directly to your tv, and then hopefully your dvr also has a toslink or digital coaxial output for 5.1 audio.
Video: Optoma HD3300, Panamorph UH480, Darbee Darblet, Samsung BD D6700 Blu Ray player, DIY Seymour Centerstage XD 138" Curved Screen
LCR - Tannoy DC12i, Sides - Tannoy IW63, Rears - Tannoy Saturn DC6ti Bookshelf, Ceilings - Tannoy CMS 603DC (TF), Tannoy CMS 601DC (TR), 3 Micro Marty/1 Full Marty DIY subs
Amplification: Emotiva XPA-3, Emotiva XPA-2, Outlaw Audio 7700, 2x Inuke 6000DSP
Receiver: Anthem MRX 720