AM5 guiding issues

[Christophe Godefroy]

I’m a new NINA and PHD2 user, coming from the ASIAIR ecosystem. I’m using an AM5N with an external ZWO 120mm f/4 guide scope and an ASI120MM Mini.

I’m experiencing significant guiding issues and losing many frames. To be honest, I don’t really know where the problem is coming from.

Here are two nights of logs: https://openphdguiding.org/logs/dl/PHD2_logs_SyW2.zip

Whenever guiding starts to fail, I stop my sequence and redo a manual calibration when possible — but with a 6‑hour time‑zone difference from my remote site, this isn’t always easy.

With a fresh calibration, guiding seems OK (around 0.12 px total RMS), but it’s very unstable.

Any help would be greatly appreciated. Christophe

[Bruce Waddington]

Your biggest problems occur when you do a meridian flip, so it looks like you have the wrong choice set for how to auto-adjust the calibration when side-of-pier changes.  That setting is on the Guiding tab of Advanced Settings and it's labeled 'Reverse Dec output after meridian flip'.  It looks like you have the option set, so un-check the box, do a fresh calibration, and that should get you past the current problem.

Regards,

Bruce

[Christophe Godefroy]

Hello Bruce,

Thanks a lot fo rthe tip, here is the new configuratino from a fresh profile created this morning. i left all by default and will run a fresh calibration this night and will post the result if still issues.

i appreciate the help as i'm stuck and do not see from where to start investigations.

Christophe

[Bruce Waddington]

No worries, we're happy to help you sort things out.  When you get going tonight, use the Calibration Assistant to get a new calibration on whichever side of pier you want.  Once you get a good result, let PHD2 guide for several minutes while watching the Dec activity to be sure Dec guide pulses are being issued in both directions and you're not seeing runaway Dec guiding.  Then flip to the opposite side of the pier and start guiding again while still looking for the runaway Dec problems you had before.  Hopefully, you won't see any.  While you're at it, open up the Guiding tab of Advanced Settings again and un-check the box for Enable star-mass detection - you don't need that.  If all goes well with the meridian flip test, you can choose to get some baseline measurements of how your mount is performing.  That will provide more information so we can perhaps make further suggestions for getting the best performance you can.  I've attached a document describing that procedure although in your case there is no need to create a new profile since you've just done that.

Good luck,

Bruce

[Christophe Godefroy]

dear Bruce, here is the result of the night

https://openphdguiding.org/logs/dl/PHD2_logs_johq.zip

it was much much better even if  i had some issues end of the session, but not sure is this is due to settings to update of the bad weather 

thanks for your feedbacks

christophe

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