New file uploaded to ap-gto


ap-gto@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ap-gto
group.

File : /1100 Periodic error testing/8-14-2018_1100_PemproRunSm.jpg
Uploaded by : uncarollo2 <chris1011@...>
Description : Measuring and refining periodic error using PEMPro

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ap-gto/files/1100%20Periodic%20error%20testing/8-14-2018_1100_PemproRunSm.jpg

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

uncarollo2 <chris1011@...>


Roland Christen
 

Hi Astronuts,
 
My recent testing of mounts included an 1100 mount set up with my 130 EDX refractor and the analysis software PEMPro. Our runs of the 1100 mount have been very consistent with low periodic error and excellent repeatability. I wanted to do a real-life test on the night sky here at the observatory and show you the results.
 
The mount's raw periodic error measured at around 3.5 arc seconds on a night of medium seeing conditions. I ran 5 worm cycles due to the seeing being not great and created a PE curve that was then downloaded into the CP4 controller as the picture shows. The curve was run again with PE correction turned on and the result was less than 1 arc second. Analysis showed that the original curve put a 2nd harmonic into the PE playback, so I refined the curve by subtracting the second curve from the first and loaded the result into the CP4. PEMPro saves all the curves, so if you make a mistake, you don't need to start all over again.
 
The final result was a periodic error of 0.5 arc seconds, and at that point I felt it was good enough for a test run. I ran the mount for several 30 minute unguided test runs and had results of 1 arc sec or less in tracking error. This was done near the meridian and high enough so that atmospheric refraction was not an issue. I also made sure that the polar alignment was adjusted to zero out RA drift, something I did very simply by watching the curves in PEMPro and adjusting the altitude axis accordingly.
 
I feel that this is quite doable for the 1100 non-encoder mount and shows the level of performance you can achieve with this premium product. PEMPro comes with the 1100 mount, and it really works. It is not difficult at all to use and is very accurate. Just follow instructions ;^))
 
Roland

P.S.  the 1100 mount really is the Cat's meow and a bargain considering what level of performance, usability, portability and overall quality you are getting. There are many 900/1200 mounts out there still in use after 20 years and this mount beats them both.


-----Original Message-----
From: ap-gto
To: ap-gto
Sent: Mon, Aug 20, 2018 5:40 pm
Subject: [ap-gto] New file uploaded to ap-gto

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ap-gto
group.

File : /1100 Periodic error testing/8-14-2018_1100_PemproRunSm.jpg
Uploaded by : uncarollo2 <chris1011@...>
Description : Measuring and refining periodic error using PEMPro

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ap-gto/files/1100%20Periodic%20error%20testing/8-14-2018_1100_PemproRunSm.jpg

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

uncarollo2 <chris1011@...>


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Roland Christen
 

For those who hate the files section, I have also posted it here on Facebook:

https://www.facebook.com/AstroPhysicsCorp/photos/a.773726079467391/1044748629031800/?type=3&theater

Rolando

-----Original Message-----
From: chris1011@... [ap-gto]
To: ap-gto ; ap-ug
Sent: Mon, Aug 20, 2018 5:47 pm
Subject: Re: [ap-gto] New file uploaded to ap-gto



Hi Astronuts,
 
My recent testing of mounts included an 1100 mount set up with my 130 EDX refractor and the analysis software PEMPro. Our runs of the 1100 mount have been very consistent with low periodic error and excellent repeatability. I wanted to do a real-life test on the night sky here at the observatory and show you the results.
 
The mount's raw periodic error measured at around 3.5 arc seconds on a night of medium seeing conditions. I ran 5 worm cycles due to the seeing being not great and created a PE curve that was then downloaded into the CP4 controller as the picture shows. The curve was run again with PE correction turned on and the result was less than 1 arc second. Analysis showed that the original curve put a 2nd harmonic into the PE playback, so I refined the curve by subtracting the second curve from the first and loaded the result into the CP4. PEMPro saves all the curves, so if you make a mistake, you don't need to start all over again.
 
The final result was a periodic error of 0.5 arc seconds, and at that point I felt it was good enough for a test run. I ran the mount for several 30 minute unguided test runs and had results of 1 arc sec or less in tracking error. This was done near the meridian and high enough so that atmospheric refraction was not an issue. I also made sure that the polar alignment was adjusted to zero out RA drift, something I did very simply by watching the curves in PEMPro and adjusting the altitude axis accordingly.
 
I feel that this is quite doable for the 1100 non-encoder mount and shows the level of performance you can achieve with this premium product. PEMPro comes with the 1100 mount, and it really works. It is not difficult at all to use and is very accurate. Just follow instructions ;^))
 
Roland

P.S.  the 1100 mount really is the Cat's meow and a bargain considering what level of performance, usability, portability and overall quality you are getting. There are many 900/1200 mounts out there still in use after 20 years and this mount beats them both.


-----Original Message-----
From: ap-gto gto@...>
To: ap-gto gto@...>
Sent: Mon, Aug 20, 2018 5:40 pm
Subject: [ap-gto] New file uploaded to ap-gto

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ap-gto
group.

File : /1100 Periodic error testing/8-14-2018_1100_PemproRunSm.jpg
Uploaded by : uncarollo2 <chris1011@...>
Description : Measuring and refining periodic error using PEMPro

You can access this file at the URL:
https://groups.yahoo.com/neo/groups/ap-gto/files/1100%20Periodic%20error%20testing/8-14-2018_1100_PemproRunSm.jpg

To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398

Regards,

uncarollo2 <chris1011@...>


------------------------------------

------------------------------------

To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gto
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Robert Berta
 

Roland,
I own both a 900 CP3 and a new 1100 CP4. And my club has a 1200 CP3.  I agree with your comments re: the performance of the 1100 mount. Plus the new features are big improvements.....having the Azimuth knobs on the South side of the scope makes it an easier reach with my 6" refractor....and the new clutches that can be disengaged make it much easier to balance the scope.  Still love the 900 but the 1100 is a huge improvement in many ways.
Still waiting on fix for wireless dropping its connection though....  ;-)     I am using a SkyFi which works perfectly so can wait until you get it figured out.


Thomas Haugh
 

Roland,

Can you elaborate on your PemPro curve RA adjustment procedure?

Tom Haugh
Pear Tree Observatory
IAU H23


George
 

Tom,

 

See our Tech Support page:

http://www.astro-physics.com/tech_support/mounts/Drift_Alignment_RA_Correction_Method.pdf

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-282-1513

Email:  george@...

 

From: ap-gto@... [mailto:ap-gto@...]
Sent: Monday, August 20, 2018 10:01 PM
To: ap-gto@...
Subject: Re: [ap-gto] New file uploaded to ap-gto

 

 

Roland,

 

Can you elaborate on your PemPro curve RA adjustment procedure?

 

Tom Haugh

Pear Tree Observatory

IAU H23

 


Roland Christen
 


Still waiting on fix for wireless dropping its connection though.
One of the things our electronic engineer is working on.

Rolando


-----Original Message-----
From: biker123@... [ap-gto]
To: ap-gto
Sent: Mon, Aug 20, 2018 9:31 pm
Subject: Re: [ap-gto] New file uploaded to ap-gto



Roland,
I own both a 900 CP3 and a new 1100 CP4. And my club has a 1200 CP3.  I agree with your comments re: the performance of the 1100 mount. Plus the new features are big improvements.....having the Azimuth knobs on the South side of the scope makes it an easier reach with my 6" refractor....and the new clutches that can be disengaged make it much easier to balance the scope.  Still love the 900 but the 1100 is a huge improvement in many ways.
Still waiting on fix for wireless dropping its connection though....  ;-)     I am using a SkyFi which works perfectly so can wait until you get it figured out.



Roland Christen
 

Sure,

All I do is watch the drift when doing a PEMPro run. The idea is to adjust the altitude axis slightly up or down until the drift zeros out. Each worm cycle takes about 6.4 minutes, and the position of the star is sampled every second or so. Once you have created and downloaded a good PE curve and turned PEM on, then theoretically you should get a straight line without the up and down motion of periodic error. You can see within 1 minute whether that straight line heads high (star drifting West) or lower (star drifting East) and make a small adjustment to the altitude axis.

I would do these kinds of adjustments on hazy nights when the air is steady and imaging is not going to be good, on a mount that is permanently set up. It's not something that I would do with a portable setup. You don't need to get that fancy with perfect polar alignment on a portable rig since you will be guiding anyway and not want to waste precious clear skies for imaging.

Rolando



-----Original Message-----
From: tom.haugh@... [ap-gto]
To: ap-gto
Sent: Mon, Aug 20, 2018 10:01 pm
Subject: Re: [ap-gto] New file uploaded to ap-gto



Roland,

Can you elaborate on your PemPro curve RA adjustment procedure?

Tom Haugh
Pear Tree Observatory
IAU H23