Adjust RA tracking rate

Yann-Eric Boyeau

Hi everybody,

I am a new mesu/sitech user. I had 2 difficult first nights with the mount learning how it works.
Last setup 0.92ge fixed my phd2 dec guiding rate being twice the RA rate. (0.92ge should be advertised on official website...)


Made my first guided subs 0,5” RMS🤩 not bad ! But corrections in RA were all in the same direction...

My polar alignment error is less than 10 ‘’ and my focal length is 630mm.


Testing unguided (but tracking on) 10min  sub, I noticed trailed stars (70” long).


So I read this thread :

I understand this solution but now I have a question :

Is there a better way to adjust RA tracking speed without « cheating » with the number of ticks ?

I read about rate OFFSET in sitech manual, is it the way to adjust RA tracking rate ? How does it works ?

Thanks a lot for your help,


Le 30 mai 2018 à 15:40, 'Rob Brown' r2d2b2@... [SiTechservo] <SiTechservo@...> a écrit :


Turns out that I had an issue with a loose screw on a gear! And maybe some other mechanical issues. I’m back to a working scope again, but I could really use some help. What are the top 5 things I need to know to get decent accuracy in Go-To? Right now my PXP RMS error is around 13 arc minutes, maximum 20. But I can’t hit an object unless I first do an offset-init on a star within 5 degrees of my target.


-Rob Brown


From: SiTechservo@... [mailto:SiTechservo@...]
Sent: Friday, May 25, 2018 3:02 PM
To: SiTechservo@...
Subject: [SiTechservo] In-person mentoring needed



I have built an alt-az mount for my 12.5" scope. Until recently, it was working in Go-To (but not well). Then suddenly it is off by tens of degrees in Go-To. Tracking is working acceptably well.. I've read the Scitech manual but I am lost. Is there anyone in the Portland Oregon area willing to spend an evening with me going through the calibration and setup? The Moon is up, so it wouldn't be like giving up a dark night! There is so much to learn!


-Rob Brown

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