Guiding appears calm, then goes crazy

[KatzinAz]

Equip:

CGEM II Mount

Celestron 1100 HD Edge

Celestron 9x50 finder scope with ASIAIR174MM guide camera attached

ASIAIR 294MC main camera

I've been struggling getting guiding to work using my Celestron OAG, so moved to use the 9x50 finder scope for testing last night.  Had decent stars to pick from.

Polar Aligned 

Plate Solved

Started PHD2 and did calibration.  

Started guiding.

Ran Guiding assistant

Accepted recommended changes

Guiding originally looked awesome (especially for me :) ) -  very calm.  Then all of a sudden things went crazy in DEC.

Stopped guiding and restarted.   The same things happened.  It went along fine for awhile, and then DEC went crazy.

after some research, it sounded like out of date ASCOM drivers should be ruled out, so I updated those.   After that, DEC guiding was calm but the RA went calm and then into the back and forth crazy motion.

The guidelog is attached.  I'm still sorting out how to read the thing...  one thing I noticed are some large changes in numbers from line 66 and 67.   

Any ideas and suggestions appreciated.  This is all new to me - so I have lots to learn.

Thanks!

[KatzinAz]

Sorry...  forgot to paste the snippet from lines 66 and 67 from the guide log.  (Log attached in original post)

65,111.091,"Mount",-0.180,0.134,0.005,-0.225,0.000,0.000,0,,0,,,,2531,35.08,1
66,113.002,"Mount",-0.120,0.209,-0.090,-0.221,0.000,-0.221,0,,122,N,,,2469,34.62,1
67,117.445,"Mount",5.607,-3.926,-0.366,6.842,-0.230,6.842,135,E,2500,S,,,2441,34.19,1
68,121.445,"Mount",-3.107,2.031,0.316,-3.704,0.183,-3.704,108,W,2043,N,,,2713,36.38,1

[Bruce Waddington]

Hi there.  I think the immediate problem is that you probably have backlash compensation enabled in your mount firmware.  That must be disabled in order to make any progress.  Beyond that, it looks like you haven’t done much study of the manual or taken the basic steps of getting your PHD2 configuration built correctly for your equipment.  For example, there’s no guide scope focal length defined, so it’s impossible to judge any of your guiding results beyond the obvious oscillations in declination.  You need to start over by running the new-profile-wizard in PHD2 and carefully entering the few items of information it needs to understand the basic properties of your equipment configuration.  Elementary how-to information is available in many places:

 

Getting Help:

https://openphdguiding.org/getting-help/

 

Documentation:

https://openphdguiding.org/documentation/

 

Best practices:

https://openphdguiding.org/phd2-best-practices/

 

Log analysis:

https://openphdguiding.org/tutorial-analyzing-phd2-guiding-results/

 

Good luck,

Bruce

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