Re: Mesu 200 Mk2 Tracking stops close to equator
Torben,toggle quoted messageShow quoted text
Sorry to hear that you’re having so many problems.
If you are getting constant drift in one direction then there are not many possible causes. Namely:
If you are getting jumps superimposed over the drift, then I can only see the following possible causes:
I don’t know if you have done this yet but I suggest you try to graph your drift without applying any guiding corrections at all. Do not use a mount model. In Maxim, you simply set the mount to guide, set aggressiveness to zero and do a tracking graph over several worm cycles. This means you will get the periodic error superimposed on the drift and quick jumps but you should essentially see a line which goes in one direction with respect to time. With SiTech you can adjust the tracking rate based on the following note from Dan (which I posted a few days ago):
"If it ALWAYS drifts the same amount for anywhere in the sky, I would check my ticks per rev, also use a time server, and software that keeps updating your clock.
You can manually edit your SiTech.cfg file (make sure you're not running SiTechExe when you edit the file).
Look for the variable labeled "RightAscensionRate=0"
Change the zero to whatever you want.
This is in arc seconds per second, can be negative.
This is a little laborious because you need to close SiTech each time, alter the config file and start SiTech again but you can get the hang of it fairly quickly. If you can tame the drift then you will be left with the jumps and the PE. The PE you can correct by guiding but the jumps are potentially a major hurdle if they’re due to mechanical issues. Correcting fast jumps is very hard. About the only thing you can do is to use an adaptive optics setup but this means extra costs and messing around and to correct quickly (say, at a few Hz) you need quite bright stars.
Hope this helps.