strange declination guiding

[pauls...@gmail.com]

Hello,

I'd appreciate thoughts on the log file, link below.

https://openphdguiding.org/logs/dl/PHD2_logs_S2Bn.zip

 I used the PHD2 log viewer to check the log and it seems to have good guiding periods interspersed with v. poor guiding periods, particularly in DEC.

The mount is well balanced and the payload is 2.5kg (max spec is 5kg)

I also think PA is good, within about 6 arcmins of pole.

I calibrated PHD2 the night before in the same region of sky (veil nebula) and reused the calibration.

Cables are well managed.

The stars in the images I took have what's best described as crazy shapes and sometimes there are two stars where there should be one,  but some of the 6 minute subs are good (10 poor to 1 good)

I think there might be a friction problem in the DEC axis perhaps?

many thanks for thoughts,

best wishes

Paul

[Bruce Waddington]

Hi Paul.  This looks very much to me like you've got a Dec backlash setting active in the mount firmware, probably programmed via the hand-controller.  You should check to be sure all backlash settings in the firmware are set to zero.

Regards,

Bruce

[pauls...@gmail.com]

Hi  Bruce, I use GSS server with the mount and the auto backlash correction feature is turned off.

thanks for help,

Paul

[Brian Valente]

>>>Hi  Bruce, I use GSS server with the mount and the auto backlash correction feature is turned off.

GSS server is separate from your mount firmware, did you check that as well?

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Brian 

Brian Valente

astronomy portfolio https://www.astrobin.com/users/bvalente/ 

[pauls...@gmail.com]

Hi Brian,

I'll download Skywatcher's synscan app which I guess will also expose the firmware features. I'll report back.

thank you,

Paul

[pauls...@gmail.com]

Please see attached an image from the synscan app's Backlash option settings.

many thanks,

Paul