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Hi Fahim
Sorry to hear of your problems – I know how frustrating these can be!
I use PHD, an (old model) Orion Star Shooter Deep Sky CCD and a WO 66mm F6 for side-by-side auto guiding with the GPUSB interface.
When PHD goes through the calibration routine, in indicates that it is clearing DEC backlash before making the DEC cal movements. I have done this for Eta Carina, Omega Centauri and other objects near the SCP and PHD has always completed the cal successfully and auto guided successfully for fl’s up to 1000mm with my rig.
Cheers
Dennis
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