This topic might be getting a bit old.... but .....
I have worked out that my Gemini (and maybe all of this version) has a definite PAC bug (polar axis correction). It issues
elevation corrections the
wrong way. Azimuth seems fine - elevation is definitely reversed.
Here's what I did.
Built a model (5 stars each side meridian, all separated by at least 2hr RA).
A=-7, E=7
Did a PAC on SAO128085 (nearest star to intersection of meridian/equator) - adjusted so as to only correct the error by about half.
Built same model again-
A=-3, E=13
A has improved, E not so.....
I did PAC on the same star - but this time, did not touch azimuth knob, and pushed the star further away from the centre with the elevation knob, instead of correcting it.....
Built same model -
A=-3, E=4 - what the?
Did another elevation-in-reverse PAC, but did make some azimuth adjustment in the correct direction....
Built same model -
A=-2, E=3
Same again.....
A=-1, E=-1
I think Gemini is up to Level 4, V1.04 nor - this unit is a V1.01.... If anyone else would try it, that might be cool..... if PAC worked well, I think it would be a huge time saver for people especially with non-permanent setups....