I see the same thing as Mike in that I some times have to adjust my dish differently for the channels on the 4Dtv, from some of those on the DVB box, but W-3 is a week sat, I had a lot of trouble with the three nets on that sat, if I would take the splitter out of the loop I could get enough quality to watch the channels with no problem but once the splitter was back in no go, the splitter I am talking about is the one so you can hook up the DVB box and the 4Dtv at the same time. I decided to make it easy to switch so I put in an extra length of cable with the slip on ends so I could just unplug the cable from the splitter and hook it straight to the 4Dtv and it fixed the problem, I get 52 quality on the 4Dtv with the splitter in the loop, something to do with the wave length, TVROPRO can explain it, I can't .
I hope this helps
Terry