Guiding Goes Wonky After Meridian Flip

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Glenn Mitchell

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Jul 20, 2026, 11:15:37 AM (6 days ago) Jul 20
to Open PHD Guiding
I have two rigs at a remote observatory. Both is experiencing guiding issues after the meridian. Guiding is excellent until then.

Both are ZWO AM5N mounts. AM5N Mount driver, PHD2, and NINA from PrimaLuceLab Eagle 6 computers.

Here are my settings...

ASI Mount
---------
Stop tracking at [5] degrees after meridian flip


PHD2
----
Reverse Dec output after meridian flip [OFF]


NINA
----
Minutes after meridian [2]
Max. minutes after meridian [4]
Use telescope side of pier [ON]
Recenter after flip [ON]
Scope settle time after flip [15s]
Pause before meridian [0min]
Refocus after flip [ON]
Rotate image after flip [OFF]

Thanks!

Cheers!

Mitch

Bruce Waddington

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Jul 20, 2026, 11:19:02 AM (6 days ago) Jul 20
to Open PHD Guiding
I think the ZWO mounts require 'Reverse Dec output after meridian flip' to be 'On'.  But to be sure that's really your problem, please upload your log files to our server using the instructions here:


Regards,
Bruce
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