How does a FTA receiver move a dish? I'm assuming that an interface is required to supply power to an existing motorized dish but I can't seem to find info on how the receiver sends the signals to move/stop a dish. I'm currently using my 4DTV receiver to move the dish but would like to remove the 4DTV from service and have the MPEG receiver move the dish instead. I'm not using the 4DTV for receiving VC or DC programming anymore.