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If you have a DishPro Plus Twin. you can run one coax to a 622, using a Separator. The Separator has two output coax leads for Tuner 1 and Tuner 2. You can run the second coax from the DPP Twin to another 622, again using a Separator. I did it a few months back while testing an old and a replacement 622. In this way, you need no external switches. The third F connector on the DPP Twin is an Input for the coax from the 129 LNB.

There have been many reports of failures of DPP Twin LNBs. Try swapping the cables that come from the two outputs of the DPP Twin and connect to your 622s (with a Separator) . That is, use the single cable with Separator from one side of the DPP Twin to connect to one 622.

Then, use the other coax from the DPP Twin and Separator on the same 622. Do the same swap of coaxes (Separators) on the other 622. Do a Switch Check each time you connect a different coax. By then, you should know if both sides of your DPP Twin are okay (or not) and whether both 622s are working normally.

I have heard of Separators going bad, so you could make sure that one coax with a Separator is working okay on one of the 622s. Then on the 622 input you know is working, swap out for the other Separator, to make sure it is okay, before you being the swapping of incoming coaxes between the two 622s. Are you following this? I am having trouble, but I am near senility.

In the 10 days I did the A/B comparison of the two 622s, I never saw a difference in using two coaxes from the DPP Twin to Tuner 1 and Tuner 2 inputs on a 622 or using one coax and a Separator.
 
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