I just got the Mercury II from the $85 deal and plan to install a motor to my dish using USALS. I am quite happy with Mercury II but have question about the loop out feature. I plan to connect Mercury II to the motor and dish and its loopout to my old FTA receiver. Should I turn off the DC power output of my older receiver? If I leave the output DC power of the old receiver on and turn Mercury II's power off can my old receiver still work? I mean will Mercury II pass through the DC power backwards from loop out to the motor and dish?