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I have read somewhere-probably the Stark Labs yahoo group FAQ- that if you are trying to autoguide on a target nearer the pole you should change the default setting up from 500 ms for the calibration steps. Try 1000ms.
When you go to other parts of the sky a calibration step of 500 ms should generally work fine
PHD as you know tries to move the star a certain distance in each direction during calibration. If your mount is caught in some backlash loop this sometimes fails-the star simply doesnt move, in which case PHD gives up. Turning off PHD and starting up again sometimes works
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