I'll have to say I don't have a clue. I say this because I have two BUD's and two 1.2m's (ku only) currently being used for one Pansat 3500s, one Coolsat 5000, one Quali-tv (for HD & 4:2:2), and one Twinhan 102g ( also for HD & 4:2:2). All four can get C-band from either BUD or ku from all four dishes. Each piece of the puzzle has it's +/- factor for each receiver and there are times when each receiver may give a better picture quality than the other three. But, all in all, nothing beats the HD pictures for best picture quality. Sometimes the Quali-tv is better and sometimes the Twinhan is better. Also I have two tv's, one is 61" 720p and the other is 70" 1080i. When a picture is broadcast in 1080i, it looks better on the 1080i set, and when a picture is broadcast in 720p, it looks better on my 720p set. But, regardless, they look excellent on either set.
4:2:2 goes out in 4:2:2, whether it's passing through a computer or a set-top box (Quali-tv). 4:2:2 has something to do with the color codec's and if it's being used, then that's what passes through.
Al