Trying to install a 3-lnb dish to my 811 receiver and I can not make all three lnb's work at the same time, I've tried a couple of diffrent switches and the receiver would not recognize them or like the dp34 switch was recognized but it want recognize the lnb's. Is there a special switch that i need or is there special lnbs that i need with the dp34 switch. I can connect the receiver to each of the three lnbs directly and each sat. one at a time but just can not get them to work together.