I was wondering if I could send a signal from two receivers to one tv? I have the 722 in one room and the 322 in another. The 322 already sends signals to one tv. But I would like to send the recorded shows to the same tv occasionally . Would it be possible to join the two signals, and how would that be done. I know that obviously one receiver would have to be off so that the other signal could go through. Could I use a regular cable splitter that converts from one to two signals? Would that be backwards compatible? Both the 722 and the 322 have something like that on the back of the receiver. Or do I need to get a special one just as the Dual tuners have, from a local installer?