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For these spurious events I like to go back to basics as a base line ……,
Re balance rig in Dec and Ra
Check your polar alignment first ( a few arc min is fine with PHD2 )
Launch PHD2 direct to mount ( not via the ASIair or your acquisition software like APT
Run through the installation wizard to ensure guide camera and settings are correct, including creating a dark library.
Run the calibration assistant to get a good calibration at Dec=0
Try the PPEC algorithm instead of Hysterisis ( I haven’t use Hysteresis in 5 years , always use the PHD2 PPEC algorithm.
Pick an object above 40 deg Alt and guide for 20 mins long enough to let PHD2 record a few worm cycles
See how it performs ?
By the way was your big spike in Ra or Dec ?
It may very well be a millisecond signal interruption to a pulse running PHD2 via other programs
Also could be Stiction on your worm or main thrust bearing ( old grease with a bit of crap in the mix )
Obviously not a cable snag ?
Obviously not a wind gust ?
These events are always a pain in butt but it’s best to start from the beginning and run the basics direct to the mount ( when it comes to PHD2 guiding )
Good luck
Martin
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