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Amateurs who have experienced difficulty with PI beam rotators freezing-up in cold weather might be interested in my inexpensive solution to this problem. Position a 150-watt light bulb just below the rotator mechanism and enclose it with asbestos paper. Connect a heavy duty power cord to the lamp and to a power receptacle. When the temperature goes down and the rotator sticks, turn on the light bulb for about fifteen or thirty minutes. The rotator will then turn "free" again.
John L. Spencer, K0IUC.