I have a Dish 500 that I am hooking up to a VIP722. I had a legacy receiver before and only had 1 cable to the receiver. I have that one cable installed in the SATALLITE 1 input on the rear of the receiver. I get all 110 satellite channels but only about half of the 119 channels....why?? There was a separator that I did not use...do I need to use that?? Please help!!