Problems with a new mount

[Alan Moore]

I've had a lot of problems with my new WarpAstron WD20 mount.   I have failed to get consistent guiding.   I am trying to figure out whether its a settings problem or a mount problem.   My last effort followed careful polar alignment using NINA three point alignment, using the wizard to set up my rig correctly, calibration using the calibration assistant, then following the guiding assistant's recommendations.   As documented in the uploaded logs, I would guide for a minute or two, then get a sawtooth pattern in the Dec axis.   I repeatedly stopped the guiding, selected a new guide star, then resumed guiding.   I would get another burst of decent guiding, then the cycle repeated.   Any help would be greatly appreciated.

https://openphdguiding.org/logs/dl/PHD2_logs_bMzn.zip

[Bruce Waddington]

You almost certainly have a non-zero Dec backlash compensation setting programmed in your mount controller.  This is done through the handset or the ASCOM driver, not through PHD2.  So you will need to find a way to set that value to zero, the same with RA as well.  Going forward, you should also start using the Calibration Assistant to do your calibrations, although that has nothing to do with your current problem.

Good luck,

Bruce

[al.mcl...@gmail.com]

Go with what the experts say (I am not one), but your guide log reports that PHD2 was connected to the main imaging camera (sensor reported as  Camera = ZWO ASI2600MC Duo (ASCOM), full size = 3124 x 2088) whereas the guide sensor is only 1920 x 1080.  Not sure if this is correct, but are you able to check which sensor PHD2 is connecting to?  If it is connecting to the wrong one this may well create issues.

[Bruce Waddington]

Good catch, Al, thanks!

@Alan:  Since you are just getting started and are having some problems, you should update to the latest PHD2 dev release, 2.6.13dev8:

https://openphdguiding.org/development-snapshots/

Then run the new-profile-wizard again and you will see that both of your ZWO cameras will be shown there and you can then choose the correct one for guiding.  Please let us know if this gets it sorted out for you.

Bruce

[Alan Moore]

Thank you.  I did find that I had backlash set at "20" and have since set it to zero.   I'll have to wait until the clouds clear to verify the fix.   I do always calibrate using the calibration assistant, btw.

R. Alan Moore, Jr, MD

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[Alan Moore]

Yes, I was frustrated by that until I found the small "settings" icon right beside the large "connect" icon.   Opening it, I was able to set the correct guide camera.   I kept looking for pixel size to be 4 instead of 3.76, but was stumped until I opened up the settings separately.   Now waiting on clouds to clear for another run at guiding

R. Alan Moore, Jr, MD

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