Last night I turned on my 722 with Aquiring Sat. single screen showing I had no signal on either input from 110 119 & 61.5. Tried running check switch but instead of doing a 1-5 count it was doing 1-38 then would give me a message that I had fewer sat than before but was finding no signal. But the 501 and 508 were working fine all connected to the same DPP44 switch. I also had another cable that was hooked to the switch that used to feed one input of my 721 tried swapping input cables to the diplexer but same result. After spending almost an hour with a person on the phone and finding out a dish tech was week away they also wanted 49.95 said I cancelled my protection plan which I did not want to do they must have cancelled this when I turned HBO ect. off. After finding out it would be week with no tv in this room was going to hook my 721 back up and use that but decided to take the diplexer out and hook one switch feed to each input on the 722 now everything is back to normal check switch was a normal 1-5 count and found all sat on both inputs. So my question is do I need a diplexor as long as there are two cables one for sat input off the DPP44? I dont plan on using the 721 although have not turned it off with dish yet. Although the part that made me laugh about this whole thing was when this CS told me in his broken english "Now dont get up on the roof and try to re aim yourdish" like I am going to do this a 10:00 pm at night. They always call me Mr Doug cause they cant pronounce my last name Neronsky. Thanks for any help.