One strange thing is that whenever the guide star is lost, there is always a big spike on DEC guiding (and the spike is always 12 pixels),
You will need to look at your PHD log file to see what PHD is sending to the mount. I assume your dither is set to move the mount at 1x sidereal for a fraction of a second, is that correct? If you are sending a co-ordinate move, you may be sending the mount in both axes to a previous location.
From: yanzhe liu <liuyanzhe@...>
Sent: Tue, Nov 23, 2021 3:27 pm
Subject: [ap-gto] Guide star lost after dithering
Not sure what the issue is and whether it is mount related, hope someone can help me out.
I have been using SGPro + PHD2 + AP mount without any issue for years, but recently PHD2 often loses guide star after dithering.
It happens to mach2 mount only (so far so good for AP1100), but it did not happen until I upgraded PHD2 to 2.6.10 (and 2.6.9dev4 for multi-star guiding).
One strange thing is that whenever the guide star is lost, there is always a big spike on DEC guiding (and the spike is always 12 pixels), even though I enable PHD2 "RA only" dither. Changing SGP settings does not help either (except disabling dither).