AP 1100GTO Can't Calibrate in PHD2 All of a Sudden?


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I am wondering if I may have an issue with my AP 1100 GTO mount.

I’ve had it for a little over a year now and it has worked without issue. I am using it for astrophotography with a C11 Edge @ 2800mm with an Ultrastar guide come on a COAG. PHD2 is my guiding software and normally my guiding has me around .3/.4 RMS in both RA and Dec. I have noticed lately that the numbers were getting a bit higher but just assumed it was atmospheric conditions. Although I had also noted that of late my stars have been a bit out of round even on short 30 sec subs.

Last night I was getting around .7 Ra and .5 Dec with a Total RMS near 1.0 arc/sec. I decided I would run a new calibration just to try and tighten things up. Unfortunately I could not get a successful calibration. PHD2 would be complaining about RA and Dec guiding rates differing by too much.

I started a post on Cloudy Nights (https://www.cloudynights.com/topic/590415-help-with-phd2-guiding-cant-calibrate/#entry8082854) before posting this issue here.

I haven’t changed anything in my routine and the only thing I did different was to run a calibration last night. I also made sure my PA was accurate, and it is, as you can see in the pics at Cloudy Nights.

It was suggested that I may need to remesh the gears? Any other thoughts on what may be causing this?



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