Thomas,
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After the merdian flip the DEC and RA behaviors were consistent, about 0.5 arc sec. That is what you'd expect - seeing limited performance. People pay thousands more than you did to get that with absolute encoders and other things.
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But, before the meridian flip the RA was three times worse than the DEC. Notice also, that because the RA was much worse the max scale change from +- 8 arc sec before the flip to +-2 arc sec after,
making the DEC look much smoother pre-flip. But the DEC error value displayed was virtually the same before and after the flip, while the RA was much better after the flip.
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The post-flip performance is very good. But, because the data is only for a brief sample of time... It is possible that, by coincidence, the post flip captures were on a different part of the worm cycle. So, if you can, try to get the ASI Air to display 8 minutes of data, or take multiple, consecutive screen captures over 8 minutes with some overlap so you can see the full pattern. Do this with the scope on each side of the pier.
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The reason for eight minutes is that four minutes is the worm period of the G11, so by capturing 8 minutes (at least) of error data you can see multiple worm cycles.
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If that is too tedious then, go the PhD2 route and inspect the logs as suggested. But do so over two full worm cycles at the minimum; eight minutes or more. Your choice.
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If it turns out that the pre- and post-flip behavior shown in these four graphs (postings 83492 and 83493) is replicated across multiple worm cycles then the problem has something to do with cable drag, mechanics of how the mount is connected to your pier, or something that is orientation dependent (balance, whatever), not the mount and drive itself.
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Hope you get plenty of clear weather to work on this.
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Mark Christensen
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