I have a dish network 500 HD setup installed about 3 years ago with a VIP 722 in one room and a VIP 211k in the basement, I am recently having poor signal on my 722, only about 25 signal quality, so I tried adjusting dish and could only get up to about 35, nothing appears to be in the way of dish, I decided to check signal quality on my 211k and I have good signal of about 80, now that tells me the dish is not the problem but I don't exactly know what else is in the system that could cause poor signal on only one receiver, I know there is some switch or transponder but don't know what they do. Can anyone tell me if I'm heading in the right direction and what to check next. Thanks.