Quote:
Originally Posted by g__day
Well that was very interesting!
With a one point alignment in polar aligned mode, PEMPro consistently advised to move the mount West 5 arc minutes and lower its elevation 2 arc minutes. I've just finished doing this and of course clouds roll in - third night in a row.
At least I was able to let PEMPro run on both Az and Alt and seeing it suggest no more than 0.4 arc minute changes. I would have then liked to track a star for a while - so of course clouds have to pour in!
Two things have left me very surprised in all this:
1. How precise the SS2K's pointing and tracking correction algorithms are in a 3 star alignment - even when I'm near 8 arc minutes off the pole and doing long, long subs!
2. How stunning a lack in Vixen's documentation about how to set the SS2K if you want to drift align! This seems to have been a momumental oversight - especially as many folk on the yahoo SS2K group had no feedback on how to set up the SS2K for drift alignment!
When I have checked everything out I then have to re-build my Tpoint and MaxPoint models - which will raise the question about do I place the SS2K in polar aligned with a 1, 2 or 3 star model? Thoughts anyone? What I really hope to see is if I now try and do a 3 star alignment after the first two stars are locked in hopefully almost no misalignment error when I go to the 3rd star (meaning the SS2K isn't once again trying to operate in Alt Az mode)!
PS
Interesting to note - PEMPro still inverts the direction of the East / West corrections - but it does get the raise lower directions correct!
Cheers all,
Matt
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Matt
I think that you have 2 choices.
Probably the easiest is to always use 1 star polar align and let T point do the corrections. You would than have to do all of your slews with TSX.
The other option would be to align with 3 stars and then map points with TPoint. This would be using a hybrid system that would have error correction from both the SS2000 and TPoint.
This would only work if you used exactly the same alignment stars each time you started the SS2000 so that the SS2000 sky model would be the same. When those stars become non useable as the season passes you would have to pick new ones and the redo the TPoint model.
