Me too,
I have been using PHD for about 2 1/2 years with no problem, until last summer where I cannot use DEC guiding at all. I get major spikes and it ruins all my images.
If I turn it off and I have good polar alignment, I can get 5 min subs with 'almost' round stars. I have to reset it after 3 images or so. It appears that the scope is OK. But I cannot find out why and I have tried everything.
I have a Meade 10" LX200GPS.
However, my DEC drive controller on the scope died, and it was replaced with a new DEC controller by Bintel and the problem started after this.
Not sure what to do and can anyone else help us both? Please.
Cheers,
Damien.
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