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If the main problem is backlash in dec you could try only guiding in RA. It is one of the options. You may be able to get long enough out of it.
David,
Sometimes the mount is running all night.
Sounds like guiding in RA won’t work.
Thanks for the suggestion.
JackWhat is the orientation of your slit? (I run mine along the Dec direction so any Dec errors due to backlash just move the star up and down the slit a bit)
Is your drift during guiding in both RA and Dec or just in Dec?
Robin,
Slit orientation is Dec.
Drift during guiding may be RA not along the slit in DEC.
JackI have seen this problem before I think. The RA (or Dec) guide corrections may have become inverted somehow (There may be a setting somewhere) so instead of correcting towards the right position it corrects in the opposite direction and the star continues to drift at an accelerating rate away from the guide position. It is connected with the meridian flip I believe. If you train and then guide on the same star does it work correctly ? Does it then not work if you move to a different star on the other side of the meridian ?
Robin,
A setting in PHD2 or TheSkyX?
I will need a clear night to experiment with this.
JackRobin,
I am using the latest version of PHD2.
Which guiders are you referring to?
Yes green square round star green cross at guide position.
The training appeared to work ok with recommendations which I applied see attached.
The star and green square continuously wonders off the guide position.
I have not tried guiding off the slit, the target star is always on the slit.
Regards,
JackAttachments:
David,
I am using a newer computer. The problem is it won’t guide on a star. The star won’t stay on the slit. Guiding instrument is a Lodestar Pro. If by calibrating the system you mean guide assistant it says there are mount backlash issues which it recommended corrections for. As a test when trying to guide on Vega it won’t stay on the slit.
So far it appears to point to a problem with the mount.
JackA great day out meeting up with like minded folk the talks and facilities were excellent.
A big thank you to the organisers.
JackAttachments:
I spent 1 week there at the Open University ‘Observing the Universe course’ in 2011 amazing place.
JackNick,
Attached is information about the Wray refractor.
Regards,
JackAttachments:
Very enjoyable meeting and get together at The Astronomer pub.
A big thank you to the organisers.
Look forward to the same next year.
JackAttachments:
Ken,
Interesting papers. I don’t see an email address here or on your website to discuss further.
Jack
