I just got my 722 and still have my older 508's in use. The 508's use channel 3 to feed to other TV's. Have a series of A/B switches I use to switch from 1 508 to other so you can watch either one on any of my 5 TV's.
Now the 722 default coax out on TV 2 is ch 60. I put a splitter to combine ch...