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Message: <blockquote data-quote="Channel Hopper" data-source="post: 741975" data-attributes="member: 175144">Polar offset would mean the arc is higher on one side and lower on the other. The errors discovered in declination suggest there may be a difference in the final angle of the dish, to that of the polarmount. Not common in prime focus systems, unless the two bearings are not set one above the other.The usual suspects are offset antennas mounted on a motor where the clamping system is not aligned correctly at true south.Since you have an elevation motor that can give you correction on the arc, I would continue using it, as the only other answer (on the design of framework on your dish) is to offset the pole to one side, or rewelding of one of the bearings, and correcting the north/south.</blockquote>