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After quite some time (almost a year!!) and a bit of fiddling, this weekend I figured how to make my (and Ritchie's, hopefully) dob to track correctly:
The problem was in absence of RTC from the system.
Once I have it connected, the tracking is quite precise (same as with my old Bartel's system).
Interestingly, I checked the available documentation, buy this detail was not mentioned anywhere (or I didn't see it) .. Maybe because noone attempted to do it without RTC?
There is a note on MEGA being more precise with RTC.. but I never had any issue with tracking in EQ mode, without or with RTC.
Anyway.. maybe this piece of info might save someone considerable effort testing their OnStep system.
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