I just got hooked up and was wondering, I have a 311 reciever and a 3900 reciever with a Dish 500 sat and a DishPro quad lnb. Will I need a switch to run both recievers. I was told by Dish Network that I won't and after doing some reading it appears that I may. Dont want to hook up anything until I know for sure. Don't want to damage anything. Hopefully thats enough info. Great site. Keep up the good work.