PHD2 setup recommendations for Ioptron GEM45?
cyen...@gmail.com
Thanks!!
bw_msgboard
I think your best approach is to create the new profile, get a clean calibration near Dec=0, then run the Guiding Assistant for awhile. You can do the GA backlash test and, if you want, let the GA run long enough to get a sense of the residual periodic error in the mount. If you accept whatever the GA recommends, that should get you close assuming the mount works reasonably well. Guiding parameters have less to do with the brand of mount than with the guider image scale, the mechanical vagaries of each particular mount, and your local seeing conditions.
Good luck,
Bruce
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Brian Valente
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Clayton Yendrey
On Sep 12, 2020, at 9:53 PM, bw_msgboard <bw_m...@earthlink.net> wrote:
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Brian Valente
Brian,Thanks for the response, that is my plan to start from scratch with a new profile wizard. I believe I read that the worm on the gem45 has a 400 sec period, but don’t know if that is correct. My plan is to let the GA get a good look by letting it go through two worm cycles once I verify the period.
I also have PEMPro now, if I need to characterize the PE in more detail for some reason. I've seen posts that indicate the PEMPro and PHD2 cab link/interact. Is this true/is there a procedure?
I’ve read in a couple of CN threads that PEC cannot be run on Ioptron mounts and guide at the same time without a ‘duel’ arising between them. Is this something you’ve run across? (Hoping a PEC isn’t necessary)
--Sent from my iPadOn Sep 12, 2020, at 9:53 PM, bw_msgboard <bw_m...@earthlink.net> wrote:--I think your best approach is to create the new profile, get a clean calibration near Dec=0, then run the Guiding Assistant for awhile. You can do the GA backlash test and, if you want, let the GA run long enough to get a sense of the residual periodic error in the mount. If you accept whatever the GA recommends, that should get you close assuming the mount works reasonably well. Guiding parameters have less to do with the brand of mount than with the guider image scale, the mechanical vagaries of each particular mount, and your local seeing conditions.
Good luck,
Bruce
From: open-phd...@googlegroups.com [mailto:open-phd...@googlegroups.com] On Behalf Of cyen...@gmail.com
Sent: Saturday, September 12, 2020 2:10 PM
To: Open PHD Guiding
Subject: [open-phd-guiding] PHD2 setup recommendations for Ioptron GEM45?
I will be receiving an Ioptron GEM45 in the next week as an alternative to my Skywatcher EQ6R that failed back in July. I'm assuming that PHD2 will tailor its intitial defaults to that mount in a new profile but thought I'd ask if there are any more specific recommendations for this mount.
Thanks!!--
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cyen...@gmail.com
Brian,
Just a quick follow up on the GEM45. It is performing very well with PHD2. I initialized as you outlined, but I did also run another calibration run as I made some adjustments to the pointing of the guidescope vs. the OTA between the first and second GA runs. DEC backlash was measured at 820ms on the first GA run, 624 on the second longer GA run.
The IPolar built into the mount provided the best PA I’ve ever done.
I guided two different sessions after the baselines were complete. The second is still going (imaging the Pleiades). The first on the PacMan Nebula 2.5 hrs avg .67 a-s ttl RMS error. The second Pleiades session is running at approx. .57 a-s ttl RMS error with approx. 30 minutes left to run in the sequence. I noticed that the DEC rms error is running about .05 a-s higher than the RA. All is still at the defaults/suggested settings from the GA with .10 minmov for both the RA and DEC. Aggression on the DEC is at the default of 100. Guide exposures are 3 sec.
I’ll upload the logs later, but I have to say that I’m happy with the out of the box performance at this point. I’m not sure there is a lot to be gained in performance with any tweaks, but I’m interested in seeing what the logs look like.
Clayton Yendrey
Sent from Mail for Windows 10
From: Brian Valente
Sent: Sunday, September 13, 2020 9:43 AM
To: Open PHD Guiding
Subject: Re: [open-phd-guiding] PHD2 setup recommendations for Ioptron GEM45?
Hi Clayton
comments below
On Sat, Sep 12, 2020 at 11:39 PM Clayton Yendrey <cyen...@gmail.com> wrote:
Brian,
Thanks for the response, that is my plan to start from scratch with a new profile wizard. I believe I read that the worm on the gem45 has a 400 sec period, but don’t know if that is correct. My plan is to let the GA get a good look by letting it go through two worm cycles once I verify the period.
I'd suggest two separate Guiding Assistant runs. The first of only a couple minutes so you can establish your min moves.
The second and separate run, you can repurpose the guiding assistant to get data on your uncorrected periodic error. i'd run it for 30-45 minutes (at the same part of the sky as where you calibrate).
I also have PEMPro now, if I need to characterize the PE in more detail for some reason. I've seen posts that indicate the PEMPro and PHD2 cab link/interact. Is this true/is there a procedure?
periodic error correction is a whole different ballgame, so i'd say stick with the above and do the separate 30-45 minute run, and based on those results you can decide if you need anything beyond default guiding, or something like PHD's PPEC algorithm, or full mount-based periodic error correction. Take a step at a time, try not to do it all at once ;)
I’ve read in a couple of CN threads that PEC cannot be run on Ioptron mounts and guide at the same time without a ‘duel’ arising between them. Is this something you’ve run across? (Hoping a PEC isn’t necessary)
in PHD forums we have heard mixed information in this regard. You are probably best to consult an ioptron user group for this (or someone here with the CEM40 may chime in).
Sent from my iPad
On Sep 12, 2020, at 9:53 PM, bw_msgboard <bw_m...@earthlink.net> wrote:
I think your best approach is to create the new profile, get a clean calibration near Dec=0, then run the Guiding Assistant for awhile. You can do the GA backlash test and, if you want, let the GA run long enough to get a sense of the residual periodic error in the mount. If you accept whatever the GA recommends, that should get you close assuming the mount works reasonably well. Guiding parameters have less to do with the brand of mount than with the guider image scale, the mechanical vagaries of each particular mount, and your local seeing conditions.
Good luck,
Bruce
To view this discussion on the web visit https://groups.google.com/d/msgid/open-phd-guiding/CAJa45i5OhWXgHX%3DatW%3DjPqPsgLezEBOvqBY7gPH7_9Dv90eLhw%40mail.gmail.com.
cyen...@gmail.com
Imaged three targets last night: The Pacman Nebula, The Plieades, and The Orion Nebula.
cyen...@gmail.com
This is consistent through the three long guiding sessions, although the last had a larger amplitude at the 200s cycle (I believe it was because the target was closer to the celestial equator)/ecliptic). Anyway there are three strong peaks, one at 200s and another at 132s, and 100s. I'm assuming these are harmonics of the worm cycle PE. I have not yet looked at the logs in PEMPRO's viewer, so just from a PHD2 perspective, would PPEC or PEC recording do anything about these?