Seelking help to improve my guiding error

[Sushant Acharekar]

Hello

I am pretty new to using PHD2 I have been using asi air till recently. I have been trying to get my guiding values lower than 1" but I am unable to get it down. I first tried a couple of times with the default values and just playing with aggression , this is my attempt at tweaking the values and using the guiding assistant to set the values. It will be really helpful to know what I am doing wrong and if there are any suggestions for improvement. 

https://openphdguiding.org/logs/dl/PHD2_logs_jtnP.zip

[Brian Valente]

Sushant,

Please describe your equipment including mount, telescope, camera, etc. 

if you have a few pics of your setup from different angles that helps too

Brian

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Brian 

Brian Valente

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[Sushant Acharekar]

Hello

Brian

Here are the details 

Scope : Stellarvue SVX090T (540mm , however plate solve says its a 560mm) Paired with zwo ASI2600 mm duo and Zwo filter wheel ( I dont use the guider camera in the duo because it struggles in NarrowBand)

Guide Scope : William Optics 50mm Unguided with ASI220 MM

Mount : AM5n

Ignore the ASI AIR in the image , its an older image I have since moved to NINA

Regards

Sushant

[Sushant Acharekar]

I have a feeling this is more of a seeing issue than any settings per se , I am too new at reading the logs to be able to say that with confidence . 

[Brian Valente]

Sushant

Seeing clearly plays a significant role in your results. look at the guiding assistant run, there are regular excursions of 2" or greater in dec (red line - where no motor is running here) and in some cases much higher in RA:

The aggressive guiding needed for strainwave mounts means you are already chasing seeing to some extent, and the very short exposure cadence exacerbates this. You might try with 1 second exposures to see if the high frequency RMS can be reduced.

I'm somewhat surprised there is any backlash in the Am5N, but apparently it's measured around 700+ms? for a strainwave you might try switching the dec algorithm to lowpass2 with moderate aggression around 60-70. I would also check with other AM5 owners to see what their experience is with backlash and which algorithms they use. afaik it shouldn't have any but maybe this is misleading and we're seeing a function of the resist switch algorithm at work.

I also think your RA aggression is too low, you can see it wandering around a bit. try 0.6 and see if that tightens things up.

 

 

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[Sushant Acharekar]

I finally got good guiding , was guiding at around 0.6" for the most part, Here are at the few things that I changed .

Did a Calibration and Used PPEC . I saw some occasional moments where the guiding went about 1" I think it was cycling and I am wondering if it has anything to do with backlash or PPEC doing something that it shouldn't. I am yet to see the logs so once I load it I can upload it here . 

[Brian Valente]

we can look at it once you upload the logs

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[Sushant Acharekar]

https://openphdguiding.org/logs/dl/PHD2_logs_UMpc.zip

I have uploaded the logs here , The initial guiding had some issues not sure what I did wrong there but I ran another calibration and it started guiding correctly. Maybe my tracking went off because it wasn't tracking the stars. I didn't run the guiding assistance since the guiding was below 1" maybe I can run that next time to see what info it outputs.

Regards

Sushant