I've been struggling with this problem for over a month. I have 2 rca directv 18" dishs, each with dual lnb's. I have one pointed at 110 and one at 119. I connected 5' of rg6 cable from each to a sw21 switch. I connected 30' of rg6 cable to the sw21 and to my 7100 receiver. I get it to see a sw21 switch but it says multi dish problem detected. I get 119 odd and 110 even and 110 odd. I don't get 119 even. If I switch the 119 and 110 dish inputs on the sw21 I get 119 odd and 110 odd, no evens. Any ideas what could be wrong?