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You don't say what receiver you are using, and don't give specifics about how you are connected, but I'm guessing that you have the Diseq switch controlling whether you are on C or Ku, and have polarity controlled by the 4DTV. In that case, then, as you suggest, you will have to scan twice, once with the 4DTV on horizontal polarity, and again with it on vertical polarity.
I also assume that you are "T"'d off the LNB coaxes using a DC block, so that the 4DTV is providing power to the LNBs. One thing I noticed with my receiver and Diseq switch, which may be different in your case, is that even though my analog receiver is providing power to the LNBs, I found it necessary to keep the lnb power option ON, for the Fortec receiver, even though it wasn't powering the LNBs, because the Diseq switch wouldn't work unless the LNB power was on.
Re setting the LNB setting to Standard, this may be different with your model receiver, but with my regular Lifetime, I had to use Standard, and set the LNB freq to either 5150 or 10750 . I found it necessary to define separate satellites for C and Ku, because it didn't seem possible to set a high and low LNB freq when in standard mode, but this may be different with your receiver.
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