I have a Shaw Direct system with the double head and eliptical dish. It has two lines coming from the dish into the house. I am upgrading my single line HD receiver at my main set to a PVR which needs two dedicated lines from the satellite. (I have two other TV sets in use.) I am doing the installation myself. I have purchased a Zinwell 4 x 8 multiswitch to handle the distribution. It all seems straight forward but I have one question. I am told that one line coming down from the dish goes into a 13 volt input at the multiswitch, the other goes into an 18 volt input. Are both lines from the dish the same or do I have to connect the correct one to the 13 volt and the correct one to the 18 volt input? If the latter, how do I tell them apart? They look the same. Thanks.