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Re: RA Mesh adjustment for 2104 model Mach 1 GTO

Brian Valente
 
Edited

I found an earlier run that looks better - and by "better" i mean relatively better than previous. At least this one kind of makes some sense:
 
image.png
image.png
 
The previous run was unguided data
 
There were significant number of failed calibration attempts
 
Not sure what's going on with the previous graph and so many difficulties with calibration. It may be that you have a cable or connection loose somewhere
 
 

On Mon, Oct 11, 2021 at 1:30 PM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
I'm afraid that is useless data.
 
Guide graphs ideally should be taken thru the main scope on ONE reasonably bright star at or near the celestial equator, at or near the meridian (either side will do). One star, not multi-star tracking!
 
What he captured here appears to be a mix of hot pixel tracking along with some periods of actual multi-star tracking.
 
Rolando
 
-----Original Message-----
From: Brian Valente <bvalente@...>
To: main@ap-gto.groups.io
Sent: Mon, Oct 11, 2021 3:14 pm
Subject: Re: [ap-gto] RA Mesh adjustment for 2104 model Mach 1 GTO

Here's the picture from those logs - unguided output with 2 second exposures, approx 20 minutes total time
 

 

On Mon, Oct 11, 2021 at 12:59 PM Roland Christen via groups.io <chris1011=aol.com@groups.io> wrote:
Guide logs are great for Geeks that like to wade thru long log files. I'm not one of them.
 
In order to evaluate the health of your mount I would like to see the following done as I asked before: a simple guide graph screen shot.
 
1) Take a 15 - 20 minute guide graph with guide exposure set to 1 second on a reasonably right star (forget multi-star guiding, it's not important for this mount health test)
2) for the entirety of the test have guide corrections turned OFF
 
Easiest way to turn off guide corrections is to set MinMove to 20.0 for both axes. Another way is to go into your guide setup and uncheck the guide corrections box for RA and Dec.
 
The screen shot should show both the drift of both axes as well as the shape of the RA periodic error for the entire 15 - 20 minute period. It will be a clean image of only the mount with none of the interference of any outside software.
 
Once I get that screen shot from you I can evaluate the state of the mount, whether the bearings are smooth or not and lots of other things that may or may not need some care or adjustment. Until i see that, we cannot do much here but watch and wait. I have only a few more days here at AP, after which I will be gone on an extended trip and won't be able to advise you until I get back the first week of November.
 
Rolando
 
-----Original Message-----
From: nicholas via groups.io <chironik=yahoo.com@groups.io>
To: main@ap-gto.groups.io
Sent: Mon, Oct 11, 2021 2:24 pm
Subject: Re: [ap-gto] RA Mesh adjustment for 2104 model Mach 1 GTO

Hello Mr. Christen.

Firstly I want to express my sincere gratitude for offering to evaluate my Phd2 log data in light of how busy you must already be.   I am not convinced that any issues are not operational efficiency, for example, I likely could improve on my guide-scope/ guide cam structure to make it more solid. On the saddle was a 152mm F8 refractor triplet with a few LBS of imaging related equipment.

Attached is Phd2 log from last night. @ 23:48 I began a recalibration, then I proceeded with the guide assist on after having skewed from the handbox from Park 3 to NGC 7541.
Thank you!

https://openphdguidi...2_logs_Yrrd.zip

--
Roland Christen
Astro-Physics
 
 

 
--
Brian 
 
 
 
Brian Valente

--
Roland Christen
Astro-Physics

 

 


 
--
Brian 
 
 
 
Brian Valente
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