I just purchased a 55" hd-ready rear projection set. I also have Dish Network feed coming in on a high-end S-Video cable. Over time, my signal strength has dropped from around low to mid 90's to around low 70's range (basically been too lazy to re-adjust). I never really noticed many problems on my old 32" set, but now that I have the projection set, i definitely see more artifacts, fuzziness, etc. I expected some loss of quality but I am wondering if signal strength will effect the picture quality or not, especially on a larger rear projection set.
Higher signal strength will not give you any better picture quality. With the digital nature of DBS, you either get a picture or you don't (there is no in between like there is with a normal analog rooftop antenna). Higher signal numbers are better because when it rains, you will have better resistance to "rain fade". Your signal is starting out at a higher level so it will have to fall further before the receiver can no longer lock on to the signal.
You are probably seeing more artifacts than you did before because your TV screen is much larger and the defects are easier to see. (The artifacts were always there but your older TV covered them up).
If you don't have a rain fade problem, you can delay re-aligning your dish - your picture will not get any better. However, if your signals continue to drop, you might want to re-tweak.
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