I just migrated to Stellarmate X so I had to setup again. Everything worked out of the box except the guiding.
After some searching I decided to decrease the aggressiveness because the guiding was over correcting massively. I reduced the RA and Dec aggressiveness to 0.5 and now its working OK. Are there any suggestions on an ideal aggressiveness setting? I am using a GEM45 mount.

Here are all the settings I use (10" RC OTA with A-P 1100 mount). Honestly, 0.6 or 0.5 aggressiveness isn't going to differ all that much. The sky conditions will matter a lot more. Also make sure you have calibrated well.

Note--a few are mount/site-specific, like GPG period, or "reverse dec on pierside change" or SEP Profile settings or guide exposure time.

Hy

It would be a really good thing if anybody could break down all those values between PHD2 and the Internal guider, so we would be able to compare and finally get rid of PHD2

Already made my tests to replicate those numbers, but with Internal Guider I'm between 0.9 to 1.3 RMS while in PHD2 going from 0.5 to 0.8 RMS and I can't figure out what I am missing.

This is great, thank you.

@Hy,

Thank you for sharing your settings & screenshots. I've taken the liberty of comparing these to my setup and can you confirm everything is similar.

But why do you leave the integral gain = 0 ?



A low value for integral gain will reduce the length of the generated pulses sent to the mount and will avoid overshooting. I think this will help you getting even better guiding results. Otherwise and if you want to share, feel free to post screenshot of your guiding chart.

@Rishi,

Basically the same feedback as my previous post:
experiment with low values ​​for the integral gain.

This avoids overshooting.

Integral gain RA : 0,35
Integral gain DEC : 0,35
Agressives RA : 0,65
Agressives RA : 0,65

Mount : NEQ6 with belt mod

FWIW, be aware that the integral gain parameter has no effect (on RA) if you are using GPG guiding (which only works on RA).
I believe GPG does have, as part of its predictions a drift component which may act somewhat like integral gain.
I highly recommend using GPG.

Integral gain is applicable to DEC guiding.

That's interesting !

Never used GPG, but you've triggered me, I'm going to experiment with it tonight.
Seems very easy at first sight, default settings and go.

I will try GPG too but the weather here is going to be bad for at least a week.

When you try GPG, the parameters to think about are Estimate Period checkbox, and Major Period.
If you have no clue about the worm period of your mount the check Estimate Peiod (look here for clues: github-wiki-see.page/m/OpenPHDGuiding/ph...unt-Worm-Period-Info).
However, it's probably better to uncheck Estimate Period and enter the known worm period in "Major Period".

Also note, that GPG takes 2 full worm periods before it's fully in effect. So, if your worm period were 383s, like mine, then that's 13 minutes. (It'll be 50% in effect in 1 period). Every time you reset guiding (e.g. find a new guide star, that timer resets).

It is exactly the same thing as PHD2's PPEC (Predictive PEC) algorithm.

Hy

Hy, you mean that the GPG algorithm, the background is the same as PPEC ?

Cause if so, I believe I should have the same result as PHD2, but unfortunately, I don't - and truly I wish I could!

Already calibrate correctly, left it for more than 2 cycles, replicate all the values but the difference is huge.