Re: New file uploaded to ap-gto
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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 ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/ap-gto/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/ap-gto/join (Yahoo! ID required) <*> To change settings via email: ap-gto-digest@... ap-gto-fullfeatured@... <*> To unsubscribe from this group, send an email to: ap-gto-unsubscribe@... <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/
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