What effect would a slow computer have on guiding and what is the best work around?. Its not normally slow but having three or four applications running may contribute to the problem.
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Hi Jon. This is a bit of a mess and rather hard to disentangle. There are two basic problem areas: 1) operational mistakes that you’re making and 2) significant limitations with the mount.
Operationally, you should get back to basics and avoid making things harder:
Considering the limited capabilities of the mount, I think you can get better help on a Vixen-specific forum. For example, it seems there is particular sensitivity to the version levels of the mount firmware:
It looks like some people have been able to make this thing work acceptably so hopefully you can too. Obviously, improving the Dec gear mesh would be a first step but maybe that’s not possible.
Good luck,
Bruce
For Dec backlash, enable auto backlash compensation, set the value to around 1200 and max 2500. It will be a start to see if you can tame this. But again, you won't
Finally it appears you have something mechanically wrong or possibly cables snagging on your dec: you can see it make a massive >30" move without any reason, indicating something instantly shifted. That's something you should track down. There are other examples as well of this.
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You’re still working with a polar alignment error that is too large, something like 25 arc-min. It looks like that concern was raised several weeks ago by Michael but you never responded to his questions. The too-large polar alignment error creates a large amount of Dec drift and that means that calibration and the backlash test are being forced to fight the drift, essentially having to “swim upstream”. You should learn how to use the PHD2 drift alignment tools and get this problem put to bed before trying to deal with the other issues. Because of what appears to be a huge amount of backlash or stiction in Dec, it is imperative that you manually clear the backlash before starting a calibration. That will have to be done every time. With PHD2 looping guide cam exposures, use the hand-controller to move the mount north (‘up’ button) until you see the stars in the display clearly moving in the same direction. Then start the calibration.
Good luck,
Bruce
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