New to PHD2 with NINA Losmandy G11 struggles

[Michael Schneider]

I have a brand new setup and am struggling to get decent guiding results from the G11. my setup includes the G11, Stellarvue SVX140, QHY 585m guide camera on QHY OAG,Moonlite Nitecrawler, Imaging camera QHY600M w/7 position filter wheel.

At the begining of the night I don't think I had the clutches tight enough. Midway through I reset to CWD and started over. Towards the end of the session I was getting OK results, but I know this mount is capable of much better results.

Any help greatly apprecieted!

Thanks,

Mike

https://openphdguiding.org/logs/dl/PHD2_logs_SC3B.zip

[Brian Valente]

Hi Mike

There's a lot of things going on here.

For starters, your calibration is never quite clean, and you are getting messages to this effect as well. It looks like the dec backlash is never quite taken up so it's affecting both axes.

I assume the nightcrawler has an integrated rotator? For now, don't use the rotator until you sort this out. There seems to be a lot of bleed between the axes, That's usually a sign the calibration has been invalidated due to rotation or guide camera movement (in your case with the OAG and rotator, i'm guessing it may be the rotator although I see your rotator angle doesn't change). They tend to mirror each other as you can see:

The G11 Dec axis has backlash, so you need to enable and leave on auto dec backlash compensation (which you did later on, and it improved things considerably)

Looking at the results, i would guide at 1 second exposure, and set the RA algorithm to PPEC with a period of 76 seconds, disable auto adjust, and set obth predictive and reactive to 80-90.

Don't bother fiddling with small changes with min move and other settings. They won't do much. 

It would help if you did a longer 30 min unguided result right after a good calibration, do this via the guiding assistant. that will help clarify the mount mechanical performance.

Brian

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Brian Valente

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

[Michael Schneider]

Brian I can’t thank you enough! I have been so excited to get this system going and then hit this road block. Very frustrating to say the least. I will take all of your recommendations and put them into effect I have another clear night tonight. I have watched every single one of your tutorials at Losmandy, so I thought I had a pretty good handle on the G11. 

You are right the Nightcrawler does have a rotator. I will leave that out of the equation for now..

[Brian Valente]

Great - let us know how it goes, send the logs when you do this

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