Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> Mounts

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | >> (show all)
OzAndrewJ
scholastic sledgehammer
*****

Reged: 11/30/10

Re: LX80 RA tracking new [Re: TALK2KEV]
      #5315469 - 07/13/12 05:25 AM

Gday Kev

Quote:

Ok I have a new HBX and will check firmware and do so more test under real sky




Ripper.
Just for fun, you can do a dry run indoors if reqd.
Just remove the OTA etc and start the scope
Select LX80-Polar mode then reboot the scope,
( as some stuff only sets correctly during startup )
Once started, do a dummy polar one star align
by just accepting the defaults as presented.
Once it says its aligned, pressnhold mode for 3 or more seconds to bring up the RA/DEC display. Note the RA
Wander off and do some gardening/ironing etc for an hour
After one hour, go back and reread the RA.
What does it say???

Andrew


Post Extras: Print Post   Remind Me!   Notify Moderator  
TALK2KEV
sage


Reged: 03/08/06

Loc: Oklahoma
Re: LX80 RA tracking new [Re: OzAndrewJ]
      #5315619 - 07/13/12 09:07 AM

I need to update firmware looking on Meade site I see Autostar updates but no Audiostar updates. Need to get with Meade or David to find the right file. I search Meade site for A3S1 but no luck

Post Extras: Print Post   Remind Me!   Notify Moderator  
Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: LX80 RA tracking new [Re: dmdouglass]
      #5315688 - 07/13/12 09:49 AM

I just have to ask, why do you keep referring to autostar as "audio star?"

-Rich

Quote:

Greetings to: Philip Neidlinger (and all others...)

Well, the above post from ur7x pretty well sums things up right now. I am an Alt/AZ user, and I love it !!!

Andrew Johansen (Australia) and I are still doing tests, and he is studying the results. I just sent him some new data this morning. This, of course, is studying the Polar alignment issues...

I am sure this will all work out. The interesting part will be what is done when Andrew figures it out. So far, we have not had Meade in the loop (unless they are following this thread).

If you are looking for a polar mount, then i would suggest a little patience for a few more days, and lets see what Andrew comes up with. We have an active user here (Dennis and Kevin) that are polar users. And their new (replacement) Audiostar should be to them in a day or so, and we should then acquire some more data. Then we will all know more.




Post Extras: Print Post   Remind Me!   Notify Moderator  
Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: LX80 RA tracking new [Re: Starhawk]
      #5315700 - 07/13/12 09:54 AM

And for the love of Galileo, can't anyone just do a star trail PE test on one of these things?

All you have to to is plop it down in equatorial mode with a lousy polar alignment, point at a star overhead, hook up a camera and let it go for 30 minutes with the shutter open. That's it. When you look at the image, the stars will have been drifting north as a result if the poor polar alignment. Periodic error gets recorded as wiggle in the star trails. See, it's easy.

-Rich


Post Extras: Print Post   Remind Me!   Notify Moderator  
jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: LX80 RA tracking new [Re: Starhawk]
      #5315726 - 07/13/12 10:02 AM

Quote:

I just have to ask, why do you keep referring to autostar as "audio star?"




Audiostar is an enhanced Autostar controller provided with several newer mounts, including the LX80. It's very similar to Autostar but it is not identical.


Post Extras: Print Post   Remind Me!   Notify Moderator  
jmiele
Patron Saint?
*****

Reged: 12/04/10

Re: LX80 RA tracking new [Re: jrcrilly]
      #5315748 - 07/13/12 10:09 AM

Does it talk to you now. I don't get it.. but I am getting old. BTW, Thanks for asking Rich, I thought I was the only boob out there that didn't know.


Best, Joe


Post Extras: Print Post   Remind Me!   Notify Moderator  
Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: LX80 RA tracking new [Re: jmiele]
      #5315765 - 07/13/12 10:15 AM

So does it have Johnny Depp describing the wonders of the night sky?

-Rich


Post Extras: Print Post   Remind Me!   Notify Moderator  
jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: LX80 RA tracking new [Re: jmiele]
      #5315813 - 07/13/12 10:41 AM

Quote:

Does it talk to you now.




Yes.


Post Extras: Print Post   Remind Me!   Notify Moderator  
idealistic
scholastic sledgehammer
*****

Reged: 12/31/10

Loc: massachusetts
Re: LX80 RA tracking new [Re: jrcrilly]
      #5315850 - 07/13/12 11:07 AM

Please tell me its Morgan Freeman.

Post Extras: Print Post   Remind Me!   Notify Moderator  
jmiele
Patron Saint?
*****

Reged: 12/04/10

Re: LX80 RA tracking [Re: idealistic]
      #5315908 - 07/13/12 11:52 AM

LOL

Post Extras: Print Post   Remind Me!   Notify Moderator  
TALK2KEV
sage


Reged: 03/08/06

Loc: Oklahoma
Re: LX80 RA tracking [Re: TALK2KEV]
      #5315978 - 07/13/12 12:46 PM

HBX in up to date going to do a couple test

Post Extras: Print Post   Remind Me!   Notify Moderator  
Tmohr36
member


Reged: 09/27/10

Loc: Nevada
Re: LX80 RA tracking [Re: Starhawk]
      #5316001 - 07/13/12 01:00 PM

Quote:

And for the love of Galileo, can't anyone just do a star trail PE test on one of these things?

All you have to to is plop it down in equatorial mode with a lousy polar alignment, point at a star overhead, hook up a camera and let it go for 30 minutes with the shutter open. That's it. When you look at the image, the stars will have been drifting north as a result if the poor polar alignment. Periodic error gets recorded as wiggle in the star trails. See, it's easy.

-Rich




Rich,

I did a 315 second exposure (5:15) with my t2i and a 120 second Drift checking exposure with Arcturus (and surrounding stars). Results are here:

http://www.flickr.com/photos/56510505@N04/7166696732/in/set-72157629942853026

bumps in the star trail = PEC the fact that the trails are not on top of each other indicate distance from proper polar alignment (I believe anyway)

BTW, I only use this mount in Polar mode, I have an LS-8 for Alt-Az and CGEM for AP.

Tom Mohr


Post Extras: Print Post   Remind Me!   Notify Moderator  
Tmohr36
member


Reged: 09/27/10

Loc: Nevada
Re: LX80 RA tracking [Re: Tmohr36]
      #5316042 - 07/13/12 01:21 PM

Andrew,

You'll forgive me for posting this here (I hope), but I did the 1 hour test after doing a 1 star fake alignment this morning. Here are my results.

Local time: 0910
Star: Sirius
RA: 06:45.0
DEC: -16 degrees 41'

Local time: 1010
RA: 06:44.4
DEC: -16 degrees 41'

I guess that shows the small amount of drift you discussed earlier in the thread.

I'll add a note here, during the Venus transit and the solar eclipse this past May and June, I had the mount set up, pointed north, accepted the two stars during alignment. After alignment successful, slewed and centered the Sun and let the mount go. Over the 4+ hours of Venus transit, I only made minor corrections every 30 minutes or so to recenter the Sun at 50x magnification through the 8" SCT.

Tom Mohr


Post Extras: Print Post   Remind Me!   Notify Moderator  
Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: LX80 RA tracking [Re: Tmohr36]
      #5316100 - 07/13/12 01:47 PM

This is progress! What was the focal length? What we want is image angular size per pixel. So that means figuring out how wide the field of view is in your telescope, then rotate the image to line up with a vertical or horizontal marker, then find the coordinates of high and low peaks and multiply by the angular size of the image width divided by the pixe size of the width.

Longer trails are needed, though. It's best if you can get three revolutions of the worm, and that makes it possible to see what the periodic element is.

-Rich


Post Extras: Print Post   Remind Me!   Notify Moderator  
TALK2KEV
sage


Reged: 03/08/06

Loc: Oklahoma
Re: LX80 RA tracking [Re: TALK2KEV]
      #5316129 - 07/13/12 02:14 PM

Test before firmware update

A2S6 firmware using LX55/75 ra rate +2.75075 Dec rate +2.75075


4.07.30am ra 18:38.1 Dec +38.47'

4.19.11am ra 18:43.4 Dec +38.47'

4.32.35am ra 18:49.4 Dec +38.47'

4.41.55am ra 18:58.2 dec +38.47'

4:52.19am ra 19:05.4 Dec +38.47'

5:01.08am ra 19:09.4 Dec +38.47'

5:05.36am ra 19:11.2 Dec +38.47' alt +44.28.15 Az 292.13.36

After letting the mount track for hour selected the star again Goto

5:0812am ra18.37.4 dec +38.47' alt +37.42.15 az 294.55.53


Post Extras: Print Post   Remind Me!   Notify Moderator  
TALK2KEV
sage


Reged: 03/08/06

Loc: Oklahoma
Re: LX80 RA tracking [Re: TALK2KEV]
      #5316139 - 07/13/12 02:25 PM

Both test was done using (fake) One star
test data after firmware up date

A3S1 firmware unsing LX80 at default rates ra +2.75075 dec +2.75075


4.06.05am ra 18.37.2 dec +38.47' alt +49.18.03 az 290.32.34

4.16.33am ra 18.41.8 dec +38.47' alt +48.18.22 az 290.52.55

4.23.30am ra 18.45.6 dec +38.47 alt +47.18.50 az 291.12.40

4.36.20am ra 18.52.6 dec +38.47' alt +46.39.09 az 291.26.04

4.46.50am ra 19.03.01 dec +38.47' alt +46.34.20 az 291.28.27

5.01.45am ra 19.10.08 dec+38.47' alt +45.12.10 az 291.57.20

asking the mount to center in Goto

5.05.59am ra 18.37.5 dec+38.47' alt +38.12.20 az 294.42.05


Post Extras: Print Post   Remind Me!   Notify Moderator  
exparrot
member
*****

Reged: 02/13/12

Loc: Dallas/Fort Worth, TX
Re: LX80 RA tracking [Re: TALK2KEV]
      #5316218 - 07/13/12 03:24 PM

Here's my fake 1-star test data.

Firmware: A3S1
RA/DEC ratios: +02.75075

START - 13:07 CDT
RA 06:45.1 / DEC -16*41'

FINISH - 14:07 CDT
RA 07:14.9 / DEC -16*41'

Jerry


Post Extras: Print Post   Remind Me!   Notify Moderator  
OzAndrewJ
scholastic sledgehammer
*****

Reged: 11/30/10

Re: LX80 RA tracking [Re: Tmohr36]
      #5316391 - 07/13/12 05:54 PM

Gday Tom/All

Quote:

Andrew,

You'll forgive me for posting this here (I hope),




Absolutely. The more in the one thread, the merrier.
Also Thks to Kev and Jerry for cross checks.
Now it gets interesting.
David was reporting about a 20 to 30 RAmin "increase" in RA
over a one hour test when polar. Ie running horribly slow.
My bench tests using LX90 motors, (but LX80 selected in the Hbx)
gave a 0.6 RAmin "decrease" in RA over one hour.
Ie i "sped up"
This 0.6 RAMin perHr lines up with the 1.01155 factor i saw in the code.

Getting Toms results this morning cheered me up a bit
as his numbers agreed with mine.

However
both Kev and Jerrys results agree with David
ie they show an RA "increase" of about 30 RAmins per hour
ie running at 50% speed.

The fact the "gotos" appear to work would indicate the
encoders are working correctly, so all i can think of now
is there are different motorcards out there,
and one lot has a problem with its internal motor speed loop.
That sorta gets destroyed by the fact that Davids scope ( at least )
tracks perfectly in AltAz.
I guess the next step is for Kev and Jerry to do real sky
altaz then polar tests, to confirm the results,
ie AltAz works but Polar keeps track of position, but tracks slow.

Edit.
To test the encoder theory under a real sky, do a proper polar setup/ align then do a goto and centre the target.
If it is clearly drifting after that, just let it go for say 10 minutes or more.
Now, without doing anything else, just hit goto again.
The scope will still have its prev targets coords loaded, so if it detects a delta between current and target, it will slew back to target.
If the scope slews back and recentres the target correctly, that proves that the scope still knows "where it is" ie the encoders etc are working, just its not tracking.

It is certainly looking weird.

Andrew

Edited by OzAndrewJ (07/13/12 08:01 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Wigleydh
member


Reged: 10/26/07

Re: LX80 RA tracking [Re: OzAndrewJ]
      #5316496 - 07/13/12 07:32 PM

Tom thank you for providing more data.


I notice that Tom mentions using his during the the Venus transit, which was almost a month prior to Kevin getting his LX80 on (06/28 I think as the 1st test was the night of 06/29). I don't see any solid info about when the rest were received. Can we list data on that?

We might want to compare when Tom, David, Jerry, and Kevin got their mounts. Could the ones having the issue of slow RA in polar, all be mounts from the 2nd batch shipped?


Post Extras: Print Post   Remind Me!   Notify Moderator  
exparrot
member
*****

Reged: 02/13/12

Loc: Dallas/Fort Worth, TX
Re: LX80 RA tracking [Re: Wigleydh]
      #5316566 - 07/13/12 08:31 PM

I got mine on 7/3. I've only been able to log about 3 real-sky hours in AltAz. No problems with gotos or tracking in that mode.

Jerry


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | >> (show all)


Extra information
19 registered and 28 anonymous users are browsing this forum.

Moderator:  Dave M, richard7, bilgebay 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 68034

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics