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That actually happen to me when I was installing my in-laws system. High signal at first, but dropped when I moved the dish by motor. The problem was that all the screws were not tight. I suggest you go back and recheck every screw and nut, especially the ones that hold the motor to the dish. The dish should feel stiff to the touch, no free play. Then again, Bill in Maine could be right, your whole arc is off and if that is the case, start at the beginning.
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