I have a captain 8000hd receiver with a sg2100 motor and a invacom quad lnbf. I get a strong signal on transponder 11736 where mta comes in clear but the pbs transponder 12140 and 12180 is very weak to the point that they don't come in. I have a 4 port DiSEiqC switch that is set linear. My dish is 31" help me bring in the pbs transponder. Also I've noticed if I go drive my motor west I get a very strong signal but nothing is scanned in on my autoscan.