For convenience sake, it's best to have a dedicated dish for any subscription service.
Subscription service receivers expect to be able to get to their dedicated satellites any time they wish.
If you screw with that, you are asking for problems.
Plus, no Dish service technician nor company tech support will talk to you if you admit to such a lash-up.
Two dishes isn't such a big deal.
It's when members here have four, five, and more dishes, that they start thinking about combining them.
The T90 torodial dish lets you mount lots of LNBs for dedicated birds, and DOES NOT MOVE.
It lets all receivers have full-time access to their birds.
Of course, for the price of $200 plus LNBs, plus wiring, plus alignment, that is usually enough to discourage the casual user.
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I was wondering if its possible to hook up my Dishnetwork LNB alongside with my standard KU Lnb so I dont have to have two dishes up on the roof? I have a Disecq switch that I can use to hook up one coax to my FTA receiver and the other one to my dish network receiver. My current FTA setup is a approx 36" dish, with sg-2100 motor. Dishnetwork is Dish500 with its standard 110/119 LNB.
The answer to this question, as worded, is:
NO.