I have just changed to a quad LNB from a single so I can add a another box upstairs. The issue I have is that on all the sky channels on 28.2 I get no signal at all, but get a good signal on all the other channels on this satellite. I also get a good signal on other Satellites. This is the same on a spider box and a zgemma. If I change back to the single LNB I get a signal again. I have tried 2 different quad LNBs and get the same thing with both. Has anybody else experienced this when changing from a single to multi LNB? Am I missing something obvious? Any help with this much appreciated as it's driving me crazy!