Quote:
Originally Posted by ballaratdragons
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Ken,
The Sitech Goto system can do pretty much the same thing, all you need is a Hi-res encoder on the RA Shaft. This Hi-res encoder is the expensive part, the cheaper version is about 400USD. But the beauty is that the Goto system already has the brains to use this encoder to improve perforamce. You dont need to buy a secondary controller to achieve it.
But here is what you can achive with it on a typical G-11
https://sites.google.com/a/sitechser...urley-mounting
1.41 arc seconds p-p (almost the Seeing conditions of the night).
I think for the near future the above type of systems using Hi-res encoder feedback can improve exisiting system performance. While we wait for Direct Drive motors to be realized in a more ecconomical package.
That being said, DIY Direct Drive is live and kicking. And it was done in shed by a braniac.
The Sitech is a also the system used by the Planewave mounts, and has been tested (with modifcation) to run Direct Drive motors. This particular motor in the bellow link is a "Home made" direct drive made by Davd Rowe (more well known for the design of the CDK optics).
http://www.siderealtechnology.com/Di...DriveTest.html
More on the home made Direct drive motor by Dave Rowe.
http://starryridge.com/telescopes/in...t_Drive_Motors
Regards
Fahim