Contrary to popular belief, it will work with only one cable attached...at least in my case it did. I relocated my 322 to my bedroom from it original location to have S-video in there, but only had one run of cable to the bedroom. I used the 322 that way for nearly a year w/o problems. Took a bit of trial & error when I hooked it up. IIRC, I had the single cable hooked to the sat #2 input. I recently had a DPP44 switch installed with my 61.5 dish, so I now have it hooked up with the seperator.