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I just purchased a 721 receiver and a Quad LNB. I now need to take the next step and install. Is it just a matter of installing the Qual LNB and stretching the cables to the rooms?
If you dont know then maybe it would be an idea to have it done by a professional.
Theres more to it than just putting the lnbf on the dish and running coax lines, the dish needs to be pointed and peaked, the whole system needs to be grounded properly as well.
Did they give you the quad lnb for free? If you were an existing customer, you could have called Dish directly, and they give you any switches, lnbs, and a free install, if necessary.
Make sure your old receivers are unplugged when you swap the LNBFs. Be especially careful if you are switching from DishPro to Legacy - either to a Legacy Quad from a DishPro Twin (probably not a dual), or if you're going the other way to fallback.
The simple procedure, is to ALWAYS do a Check Switch with NO feeds connected, followed by a power-plug reboot and another Check Switch whenever you switch LNBFs. It's usually overkill, but always safe.
Note that 4-digit model number receivers will NOT work with DishPro without extra hardware.
If I have confused you with all this, either read a bunch of threads (the info is all here somewhere), or call that pro that Van and Rob suggest.