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PHD2 Guidelog - AZ-EQ5

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#1 CharLakeAstro

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Posted 24 June 2022 - 08:56 PM

Had a great run last night - first night under the stars after adjusting most of the backlash from the RA and DEC worm per Cuiv the lazy geek's videos.

The guiding seemed to be very good... and it was a good night to test, as the seeing was very stable.

 

I know it is easy to obsess over watching the guidelog, but, it was nice to watch on a night of good seeing. I was seeing Pk-Pk 2.9 arc-sec.

Seem to me that is quite acceptable tracking for this particular mount, and a fair shake better than before I had it dialed in.

 

ICLIQMz.jpg


Edited by CharLakeAstro, 24 June 2022 - 09:17 PM.


#2 OzAndrewJ

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Posted 24 June 2022 - 09:06 PM

Gday CharLakeAstro

Looks like the unguided tracking was very good based on the low no of corrections.

That said, i note the guider scale is 4 arcsec per pixel and the min move is 0.2(pixel).

At that setting, it wont try to adjust until the star has drifted 0.8arcsec off target.

It wouldnt hurt to try a lower minmove when the seeing is as good as you had.

Andrew Johansen Melbourne Australia


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#3 CharLakeAstro

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Posted 24 June 2022 - 09:16 PM

Thanks Andrew

Yes good advice. Last night my imaging FL was around 400mm (quite forgiving) - but tonight I will reduce the min move.

I appreciate / value your insight - especially with the AZ-EQ5 mount - have read many of your posts and your sharing of info has helped me.



#4 CharLakeAstro

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Posted 24 June 2022 - 09:20 PM

Footnote - I have not enabled PEC in the mount or Predictive PEC in PHD2 yet. Wanted to first see the mount without it... 



#5 OzAndrewJ

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Posted 24 June 2022 - 09:42 PM

Gday CharLakeAstro

Footnote - I have not enabled PEC in the mount

Do not do that if you are using EQMod, it will kill your calibrating and guiding.

The AZEQ5 has 1200 PPEC bins ( ie 0.5sec per bin )

At the rate it runs, it simply kills EQMod based guide corrections

as EQMod doesnt handle mount based PPEC properly.

This results in failed calibrations and underguiding in PHD.

GreenSwamp does handle mount based PPEC properly

 

Andrew Johansen Melbourne Australia


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#6 CharLakeAstro

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Posted 24 June 2022 - 10:07 PM

Thanks!!  I am using EQMOD so this is really helpful to know.

So... if I understand clearly -  the PHD2 predictive PEC would still be OK then... but don't use the mount based Permanent PEC with EQASCOM.

 

Gday CharLakeAstro

Do not do that if you are using EQMod, it will kill your calibrating and guiding.

The AZEQ5 has 1200 PPEC bins ( ie 0.5sec per bin )

At the rate it runs, it simply kills EQMod based guide corrections

as EQMod doesnt handle mount based PPEC properly.

This results in failed calibrations and underguiding in PHD.

GreenSwamp does handle mount based PPEC properly

 

Andrew Johansen Melbourne Australia



#7 OzAndrewJ

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Posted 24 June 2022 - 10:44 PM

Gday CharLakeAstro

 

So... if I understand clearly -  the PHD2 predictive PEC would still be OK then... but don't use the mount based Permanent PEC with EQASCOM.

Correct

Basically, it took me a while to figure out what was going on

as i couldnt get guiding to work after training the PPEC.

( i had the first AZEQ5 in Oz so no info to read up on )

I ended up sniffing out how the handbox worked and got the answer.

The Synta motor cards are "dumb" when it comes to "pulseguiding" via serial commands.

When PPEC is ON, every time a bin changes, the motor card simply resets the speed,

This is totally independent of the handset/EQMod.

To allow pulse guides to work, the handset effectively

turns PPEC OFF, does the move ( via a simple speed tweak ) and then turns PPEC ON

EQMod doesnt do the disable/enable part, so as soon as a move is sent,

if a bin rolls over, the move gets stopped.

That said, You can use mount based PPEC if you guide via the ST4 port

as the motor card controls that port, hence knows how to deal with it.

Andrew Johansen Melbourne Australia


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