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That is more than likely your TV. Do you have another TV in the house to double check? It could be your picture tube going. How old is the TV, also?

My guess would be that the dish is just slightly off - balance. I'm betting that the contractors never took the dish off and checked the foot.

Use single mode on the receiver.

Locals were on 7. They're getting them off 7 and moving them to 105 because of the problems installers were having with transponder 7. For instance, if you hit 65 on transponder 7 in Michigan, that was GOOD signal. If you really worked at it, 75 was about the best you could get. Now, just...

Transponder 7 channels are being migrated over to transponder 10 to alleviate the problem with transponder 7 as of today. That's probably what fixed you ... and the dish alignment.

Transponder 7 on 121/105 is still crap. Here's what I would do. Disconnect the ground (green wire). Your house may have a grounding problem, and you're feeding the dish your electrical backfeed. More than likely, the dish is out of tune -- transponder 7 can be a PITA at times. As far as...

Transponder 7 is the main feed for the locals on 121/105. If there is not signal, or low level on that transponder, your locals will be shoddy, or nonexistant. You just need your dish tuned properly. No big deal.

You would need to run both lines from the Twin LNBF to the 34 Switch. The switch will take control from that point. Diplex as necessary.