Hi Valentin. Thanks for status update on PEC. I see in the Indi Control Panel the count for RA steps changing as mount tracks and 123798 for RA Period and 6 for Dec period but not sure what these values represent. Anyway seems like I should be concentrating on getting GPG.
I had read the Kstars manual but thanks for link to Forum topic I also read The Gaussian Process Guider paper and boy that needs a bit of time to understand. I would still like a better understanding of GPG to help get it working for me. This is my understanding so far. Please put me right on what I have wrong!
1)GPG needs several worm cycles to build up the data to make best predictions and it doesn't need to be indexed to any particular worm position, just gather data to span a worm period, in my case about 198 seconds.
2) I notice the Ekos documentation for the GPG settings don't all match the Default settings. Periodic Length scale is 10 secs as default but 16 in the guidance doc. Number of periods for interference is 4 by default and 2 in the documentation. Which should I use?
3) Hy says it starts to contribute estimates after one period and fully kicks in after 2 periods and his 'Number Periods for Interference' is set to 2. I will try 2 as well. If its 2 cycles for GPG to learn then I guess I need to wait 7 minutes.
4) Hy is guiding through the main telescope but I have a smaller 60mm Antares Versascope and a 120mm mini. The image scale for the guider is 3.4 "/pixel and for main camera 0.32 "/pixel. Does this influence my guide settings? For example it's recommended to bin 2x2 but that would double my guider image scale. I guess I am looking to work down to a theoretical +/-2" guiding accuracy (the green circle) and indeed the drift Plot seems to suggest this but I am not sure I believe it as a good image and a poor image look very similar in the spread of the plotted points. I find RMS for RA is the best indication which I am striving to lower. It was around .6 at best with GPG off but I understand .5 on good night and .3 on superb night.
5) Pulse for calibration is 1000 by default but Hy is set to 200. Should I use a larger value for my greater image scale?
6) After a slew does GPG need some time to settle down again? Does it re-learn?

I took 300 second unguided images and could clearly see a drift pattern which I put down to PE. With guiding on and GPG off star images were much improved, almost acceptable. With GPG on the images looked much like unguided images. Just a thought but when GPG is learning is guiding turned off?

Need a clear night for further testing....
Thanks
David

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