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Are you using ST4 guiding ( guide camera to mount ) ? If so , ditch it and use Ascom pulse guiding ( guide camera direct to laptop) enables you to guide on both sides of the meridian without issue, allows you to save a good Calibration for reuse over months and months , easier to analyse and diagnose PHD2 logs
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Pulse guiding through ASCOM.
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Check Backlash and Stiction in both Dec and Ra , worms may need adjusting ?
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Doing that tonight - RA guides fine, just DEC - I'm thinking this is the main issue.
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Ensure you achieve good calibration at Dec 0 ( Calibrate near celestial equator and close to north meridian)
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Will redo the calibration & see once the skies clear again.
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Check balance in both Ra and Dec
How’s your Polar Alignment ? Under an arc minute ?
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Both good.
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Run the Guide Assistant in PHD2 , it may pick up the problem
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Will do. Thanks.