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How do I pause guiding in the middle of PPEC?

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#1 betelgeuse91

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Posted 18 April 2019 - 11:18 AM

So I found that PPEC will begin again from scratch with a new target.

I want to pause guiding for checking the focusing while using PPEC, and resume when I am done. 

 

Will stop guiding and resuming reset the PPEC? How should I do this properly..? 

 

Thanks a lot!



#2 Stelios

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Posted 18 April 2019 - 11:53 AM

You don't say which mount you have, but in general the mount doesn't know guiding is taking place (think about it--if the guider is paused or the guider is issuing no corrections because tracking is perfect, how can the mount know the difference?).

 

What I think you are describing is that PPEC restarts after a slew. This does not affect whether you choose to guide or not. PPEC makes guiding generally easier and allows for longer exposures, but doesn't require, assume, or validate guiding.

 

Bottom line--stop guiding and restart when you want to. No worries.



#3 StephenW

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Posted 18 April 2019 - 12:21 PM

>So I found that PPEC will begin again from scratch with a new target.

 

Do you mean the PPEC algorithm in PHD2 or PEC in your mount?



#4 betelgeuse91

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Posted 18 April 2019 - 01:05 PM

You don't say which mount you have, but in general the mount doesn't know guiding is taking place (think about it--if the guider is paused or the guider is issuing no corrections because tracking is perfect, how can the mount know the difference?).

 

What I think you are describing is that PPEC restarts after a slew. This does not affect whether you choose to guide or not. PPEC makes guiding generally easier and allows for longer exposures, but doesn't require, assume, or validate guiding.

 

Bottom line--stop guiding and restart when you want to. No worries.

 

>So I found that PPEC will begin again from scratch with a new target.

 

Do you mean the PPEC algorithm in PHD2 or PEC in your mount?

 

My apologies. I did not make it clear there. I meant the PPEC algorithm for PHD2 for RA correction. 



#5 StephenW

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Posted 19 April 2019 - 12:05 PM

My apologies. I did not make it clear there. I meant the PPEC algorithm for PHD2 for RA correction. 

As far as I know it is not affected by "pausing" guiding (e.g. when doing a dither), but it does need to be restarted if you "stop" guiding (e.g. when slewing to a new target)

 

You should probably post on the PHD2 forum to get a complete answer, and maybe request enabling a re-start feature... 

 

I've often considered whether PHD2 could read and save the worm phase position (it's available via the ASCOM interface for many mounts) and could then re-apply it's PPEC across multiple nights.    For me though PPEC generally takes two worm cycles (~8 minutes of guiding) before "kicking in", so it's only a mild annoyance.




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