Date   

Re: High RMS values with PHD2

Peter Bresler
 
Edited

Did no know I did that! Navigating all these forums can be difficult. Its not always that easy to post a message.

Here is the link from last night. There was one episode again when the mount went awry. I also was not able to calibrate with the OAG at native focal length on the Planewave, but that is another issue. I wound up using a guide scope

https://openphdguiding.org/logs/dl/PHD2_logs_Ryge.zip


Re: Galaxy group in Eridanus

Emilio J. Robau, P.E.
 

Geoff,

That is really a beauty and the target is now on my hit parade.  As soon as the moon gets out of the way, it will be my early evening target.  You did a wonderful job, and thanks for bringing it to my attention.  Dr. Henning: Go Gators!  1984 BSCE.


Re: Galaxy group in Eridanus

Richard Hennig
 

Dear Geoff,

That’s a beautiful galaxy group. I love the details in your picture. I wonder if one can visually detect more than the two bright galaxies.

Best wishes,
Richard

— 
Richard G. Hennig
Professor and Alumni Professor of Materials Science and Engineering
Associate Director, Quantum Theory Project
Department of Materials Science and Engineering, University of Florida
Email: rhennig@...
Web: http://hennig.mse.ufl.edu

On Jan 19, 2021, at 10:39 PM, Geoff Smith <ghsmith45@...> wrote:

This is a nice little group which, rather surprisingly, is not often imaged. While the galaxies are not big, they still reveal some detail.
Technical information here https://www.astrobin.com/ktv8f5/?nc=user

Larger res here https://www.astrobin.com/full/ktv8f5/0/

Geoff



Re: High RMS values with PHD2

 

Hi Peter

It looks to me like maybe your mount was slipping in alt? there appeared to be substantial polar misalignment in your setup

looking at your "before runs" that were working, you can see most of the corrections are in one direction ie polar alignment is off:
pier side east
image.png
pier side west
image.png
then your guidestar degraded and was lost

Also during your many attempts at calibration, DEC did not appear to be responsive, maybe a bad cable there?

even after a successful recalibration, your PA looked still substantially off. in the second guidelog things seemed better

you might do a guiding assistant run after your calibration and measure polar alignment, as well as get other recommendations for your guiding settings? you only need 2-3 minutes for that.


Brian

On Tue, Jan 19, 2021 at 10:25 AM Peter Bresler via groups.io <PABresler=aol.com@groups.io> wrote:
https://openphdguiding.org/logs/dl/PHD2_logs_wkhU.zip

Here is the link for the log. I see you also post on PHD. To tell you the truth, I had to mark notifications from that forum as spam, because they were coming through constantly, and I was unable to reset the notification. 

In any case somehow I got things back to normal last night, but I am not sure what caused the problem, and what fixed it.



--
Brian 



Brian Valente


Re: Bad initial guiding on my AP600e

Worsel
 

Tom


I do not know about the 600, but A-P recommends a separate power supply for their recent mounts.

Bryan


Galaxy group in Eridanus

Geoff Smith
 

This is a nice little group which, rather surprisingly, is not often imaged. While the galaxies are not big, they still reveal some detail.
Technical information here https://www.astrobin.com/ktv8f5/?nc=user

Larger res here https://www.astrobin.com/full/ktv8f5/0/

Geoff


Re: Bad initial guiding on my AP600e

Tom Blahovici
 

I guess it doesn't help that the temperature was at -10C.  Seems to get worse as the temperature goes lower. Last night it was only one exposure where I had this issue.  Last week, when the temperature was -15 I had quite a few more.
Is it possible the power supply contributed?  I have a powerwerx 30 amp switching supply but I power the whole imaging setup with it.  This includes a ASI6200, ASI290, Moonlight Nitecrawler and a dew heater.
Tom


Groups.io Management (was: RE: [ap-gto] High RMS values with PHD2)

Karen Christen
 

Hey Astro-Nuts,

 

Please don’t hesitate to reach out to me directly if you have any questions or trouble with your AP forums on Groups.io.  I realize Peter is talking about another group below, but I’m happy to help anyone who might be frustrated.  There are methods to set up your account to suit your needs and preferences.  My email is: karen at astro-physics dot com. 

 

Clear skies!

Karen

AP

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Christopher Erickson
Sent: Tuesday, January 19, 2021 12:32 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] High RMS values with PHD2

 

NEVER mark messages from Groups.io as SPAM. That creates massive headaches for many other users, for many group moderators and also for Groups.io in general.

 

MUCH better to seek Groups.io customer support if you can't figure out how to modify your notifications settings.


"My advice is always free and worth every penny!"

 

-Christopher Erickson

Observatory Engineer

Summit Kinetics

Waikoloa, Hawaii

 

 

On Tue, Jan 19, 2021 at 8:25 AM Peter Bresler via groups.io <PABresler=aol.com@groups.io> wrote:

https://openphdguiding.org/logs/dl/PHD2_logs_wkhU.zip

Here is the link for the log. I see you also post on PHD. To tell you the truth, I had to mark notifications from that forum as spam, because they were coming through constantly, and I was unable to reset the notification. 

In any case somehow I got things back to normal last night, but I am not sure what caused the problem, and what fixed it.


--
Karen Christen
Astro-Physics


Re: High RMS values with PHD2

Christopher Erickson
 

NEVER mark messages from Groups.io as SPAM. That creates massive headaches for many other users, for many group moderators and also for Groups.io in general.

MUCH better to seek Groups.io customer support if you can't figure out how to modify your notifications settings.

"My advice is always free and worth every penny!"

-Christopher Erickson
Observatory Engineer
Summit Kinetics
Waikoloa, Hawaii


On Tue, Jan 19, 2021 at 8:25 AM Peter Bresler via groups.io <PABresler=aol.com@groups.io> wrote:
https://openphdguiding.org/logs/dl/PHD2_logs_wkhU.zip

Here is the link for the log. I see you also post on PHD. To tell you the truth, I had to mark notifications from that forum as spam, because they were coming through constantly, and I was unable to reset the notification. 

In any case somehow I got things back to normal last night, but I am not sure what caused the problem, and what fixed it.


Re: Bad initial guiding on my AP600e

Ram
 
Edited

I used this mount when I was getting started in AP.  I have since upgraded to a newer AP mount 
This mount has significant stiction on the DEC axis. This appears as backlash when you calibrate with PhD or any other software. But this isn't backlash in the true sense of the term. This mount uses plane bearings on the DEC axis that are quite sufficient for the payload but unfortunately suffers from stiction.
The mount will not move over several commands and then suddenly take off.  It has overcompensated now and will again have to be guided back.  And then it goes on oscillating. RA guiding is usually awesome but DEC guiding is a disaster. 

I do not know a good solution to the stiction issue, maybe a light lubricant on the DEC axis rather than a heavy one may help but it may introduce other issues. 

But there is a very easy workaround: Dont polar align too precisely.  Set phD to guide in only one direction on the DEC axis. When it is moving in only one direction, there is very little stiction. You will see your problems go away.


Re: High RMS values with PHD2

Peter Bresler
 

https://openphdguiding.org/logs/dl/PHD2_logs_wkhU.zip

Here is the link for the log. I see you also post on PHD. To tell you the truth, I had to mark notifications from that forum as spam, because they were coming through constantly, and I was unable to reset the notification. 

In any case somehow I got things back to normal last night, but I am not sure what caused the problem, and what fixed it.


Re: Bad initial guiding on my AP600e

Emilio J. Robau, P.E.
 

Indeed,

 

If it ain’t broke, don’t broke it.

 

Emilio J. Robau. P.E.

Professional Engineer

Florida, Montana, North Carolina

www.robau-designs.com

 

Designs for Human Habitation and Environmental Conservation

Civil Engineering - Project Management – Permitting – Consulting  Ph: 239-206-8000 Direct: 239-204-4322

2770 Horseshoe Drive S, Suite 7, Naples, Florida 34104

 

This e-mail message is sent from Robau and Associates, LLC, and is intended only for the addressee. This message and any attachments may contain information that is confidential or privileged. Upon receipt of any electronic file/data from Robau and Associates, LLC, you are agreeing to the following: This file/data is for informational purposes only. It is the responsibility of the recipient to reconcile this electronic file/data with the actual project site conditions. Recipient agrees to indemnify and hold harmless Robau and Associates, LLC for any defects or errors in this file/data.  Unauthorized use, dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this email in error, please notify the sender by reply e-mail and delete the message and any attachments.

 


Re: Gtocp3

Roland Christen
 

It's on the side of the box.

Roland



-----Original Message-----
From: steve711614 via groups.io <steve.duck@...>
To: main@ap-gto.groups.io
Sent: Tue, Jan 19, 2021 4:38 am
Subject: [ap-gto] Gtocp3

Hello I am trying to find the serial number of the cp3 controller box 
Steve

--
Roland Christen
Astro-Physics


Re: Bad initial guiding on my AP600e

Roland Christen
 

Adding simple backlash compensation is not something I recommend. It can very easily cause system instability in Dec. PHD2 has a new adaptive compensation that might work well, but you would need to go to their user group to find out if this fits your needs. If your guiding is good then i would leave it be.

Rolando



-----Original Message-----
From: Emilio J. Robau, P.E. <ejr@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Tue, Jan 19, 2021 9:16 am
Subject: Re: [ap-gto] Bad initial guiding on my AP600e

Roland,

A follow up on dec backlash.   So, I should be allowing PHD to measure backlash and then applying it accordingly?  I thought the recommendation was not to do that.   Even without it, I have excellent tracking.
 
Thanks
 
Emilio J. Robau. P.E.
Professional Engineer
Florida, Montana, North Carolina
 
Designs for Human Habitation and Environmental Conservation
Civil Engineering - Project Management – Permitting – Consulting  Ph: 239-206-8000 Direct: 239-204-4322
2770 Horseshoe Drive S, Suite 7, Naples, Florida 34104
 
This e-mail message is sent from Robau and Associates, LLC, and is intended only for the addressee. This message and any attachments may contain information that is confidential or privileged. Upon receipt of any electronic file/data from Robau and Associates, LLC, you are agreeing to the following: This file/data is for informational purposes only. It is the responsibility of the recipient to reconcile this electronic file/data with the actual project site conditions. Recipient agrees to indemnify and hold harmless Robau and Associates, LLC for any defects or errors in this file/data.  Unauthorized use, dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this email in error, please notify the sender by reply e-mail and delete the message and any attachments.
 

--
Roland Christen
Astro-Physics


Re: Gtocp3

George
 

Steve,

 

It will be a sticker on the right side, unless it is an early CP3,  which may not have one.   It will be GTOCP3-xxxx.

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of steve711614 via groups.io
Sent: Tuesday, January 19, 2021 4:38 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] Gtocp3

 

Hello I am trying to find the serial number of the cp3 controller box 
Steve


Gtocp3

steve711614
 

Hello I am trying to find the serial number of the cp3 controller box 
Steve


Re: Bad initial guiding on my AP600e

Emilio J. Robau, P.E.
 

Roland,


A follow up on dec backlash.   So, I should be allowing PHD to measure backlash and then applying it accordingly?  I thought the recommendation was not to do that.   Even without it, I have excellent tracking.

 

Thanks

 

Emilio J. Robau. P.E.

Professional Engineer

Florida, Montana, North Carolina

www.robau-designs.com

 

Designs for Human Habitation and Environmental Conservation

Civil Engineering - Project Management – Permitting – Consulting  Ph: 239-206-8000 Direct: 239-204-4322

2770 Horseshoe Drive S, Suite 7, Naples, Florida 34104

 

This e-mail message is sent from Robau and Associates, LLC, and is intended only for the addressee. This message and any attachments may contain information that is confidential or privileged. Upon receipt of any electronic file/data from Robau and Associates, LLC, you are agreeing to the following: This file/data is for informational purposes only. It is the responsibility of the recipient to reconcile this electronic file/data with the actual project site conditions. Recipient agrees to indemnify and hold harmless Robau and Associates, LLC for any defects or errors in this file/data.  Unauthorized use, dissemination, distribution or copying of this e-mail and any attachments is strictly prohibited. If you have received this email in error, please notify the sender by reply e-mail and delete the message and any attachments.

 


Re: Bad initial guiding on my AP600e

Worsel
 

Tom

PHD2's adaptive backlash compensation MAY be able to mitigate (not eliminate) that amount.  If not, you can try uni-directional Dec guiding.  See pages 28 and 29 of the PHD2 documentation.

Bryan


Re: Bad initial guiding on my AP600e

Tom Blahovici
 

Ok,
I thought I had it adjusted well.  I re-greased the mount a while ago, and used a dial indicator to determine the play. Ok, maybe I can set the direction of the final slew or delay Voyager for a longer period.
Or just wait for my AP1100! 
Tom


Re: Bad initial guiding on my AP600e

Roland Christen
 


If I look at the PhD guiding assistant it tells me I need 2300 ms of dec backlash compensation.  So is this related to Dec backlash?
Yes, this is exactly Dec backlash and is typical of this mount. You can try to adjust it out, but it's not an easy thing to do.

Rolando

-----Original Message-----
From: Tom Blahovici <tom.va2fsq@...>
To: main@ap-gto.groups.io
Sent: Mon, Jan 18, 2021 6:31 pm
Subject: [ap-gto] Bad initial guiding on my AP600e

Hi
I have run into something with PhD guider that I would like feedback here first before going to their forum.
I use Voyager, and the way this works and the problem is :
1) It does a precise goto to an object.  In other words it does a goto, then it plate solves and if the error is less than 18" it starts the PhD guiding.
2) On this first positioning, and the start of guiding, the dec axis plot is drifting down a lot.  You can see that there is a lot of corrections being made.  As the Dec drift gets worse than 2" of arc, Voyager aborts.
3) Voyager, restarts the guiding and then all is OK.  The overall guiding is better than 0.5" over 20 minutes.

If I look at the PhD guiding assistant it tells me I need 2300 ms of dec backlash compensation.  So is this related to Dec backlash?
I am using a CP4. 

Thanks for any insight.
Tom

--
Roland Christen
Astro-Physics

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