I am trying to replace an older Direct Tv Receiver with a new D12-100 receiver at hunting camp. I have a 18x20 3 lnb dish which works perfectly with the old receiver but when I hook up the new receiver to the old dish, perform the satellite setup change the dish type and change from swm to multichannel, the picture is pixelated, intermittent and I can not receive local channels. The channel guide is also incorrect for some channels This is a straight 30' coax run with no splitters, or filters inline from dish to swm in on the receiver. The receiver is from a house just up the street where it works perfectly on a 5lnb SWM HD Direct Tv setup. Satellite signals are all in the 90-100% range. Do I need a B-Band converter for this setup? HELP!