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Hi Bob,
I have a Bartels system too and I like it a lot. I plan to add encoders with a David Ek box. I have the Ek box completed. It is not hard to build but I have some electronics minded friends who helped with mine so it was very easy for me.
I have a friend I observe with regularly and he uses the Ek box with Carte du Ciel. He has his laptop attached to his scope with Velcro. You can see the screen display changing as he moves the scope around. It's a very nice system. I use astromist regularly (PDA planetarium). I understand it works well with an Ek box too. I use it with my Bartels system over a bluetooth connection which is very convenient.
Good Luck!
Rod.
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