Date
1 - 9 of 9
slewing sound level
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Marc Zukoff <yooody@...>
I have a 400 gto mount on order but would like to educate myself on
the mount before its arrival. Would someone explain the alignment process for visual use in lower powered fov, and how long the methods took. Does the mount come with a polar alignment scope?. How about alignment without sighting polaris?. I currently use an ultima 2000 which is aligned quickly in alt-azm, and is actually very quiet.Thanks. -- In ap-gto@..., "Jeffrey D. Gortatowsky" <mrrockets@h...> wrote: Rich,rereading the original I realized whomever it was posting (grayfox65?) wastrying to get way more precision than I currently need. I mean it was _great_to get all this information, and I did file it away, but I was thinking tomyself: the FOV of aPowerMate! :^D Can't I do a quick two star alignment and startobserving? Thencase. So I trashed the email. I think we are talking about two differentcriteria for pointing accuracy here. Me thinks grayfox65 wants to put it on aCCD chip or somptin' like that. Or I could just be out in left field. |
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ericj <ericj@...>
Rich N. wrote:
I was a little surprised Hi Rich: I had the same impression, but thought it was because I was use to using my Dob mount, which barely makes a sound as I manually slew from one part of the sky to another. From what you and your friend noted it seems like this level of noise is normal. Clear Skies, Eric |
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Paul Hyndman <pghyndman@...>
Hi Jim,
Some of the servers have been up, down (and all around!) this past week ,
so you may have missed Marj's posting about the polar allignment scopes on the
7th... it was:
"We
are finalizing arrangements for a new polar scope which I hope to have by the
summer. We will send notice to all people who have purchased GTO mounts and
anyone else who is interested. Will also post on the web site.
Marjorie Christen
Astro-Physics"
So there ya' have it!
Paul
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J. L. Schenz <deltatec@...>
Derek,
Your operative words were: "If I want to use GOTO with fairly good accuracy, I align with the
polar
Oh where,oh where can a polar scope be found? ; ^) Jim Schenz Derek Wong wrote: "Jeffrey D. Gortatowsky" wrote: --
Delta Technologies, Limited
Phone: +651.439.5741
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Derek Wong <dawong@...>
"Jeffrey D. Gortatowsky" wrote:
For visual observing without GOTO, I just sight Polaris through the polar scope hole and power up. If I want to use GOTO with fairly good accuracy, I align with the polar scope then calibrate--no iterations needed. That is good enough to get well inside the field of a decent sized eyepiece. Derek |
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Rich N. <rnapo@...>
Thanks Ron. What slew rate do you usually use?
At 1200 and 900 the Dec motor sounds like it is really working. I felt like I was wearing it out just doing about four passes (eight slews) back and forth between Pollux and Polaris to get a semi good polar alignment. Rich Roland says you can do a one-star alignment if you are either already polargreat convenience for casual observing: all the benefits of the goto features |
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Ron Wodaski <ronw@...>
Roland says you can do a one-star alignment if you are either already polar
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aligned, or don't care to increase the accuracy of your rough alignment. To do this, start the two-star alignment, and quit after the first star. The mount will cheerfully accept. I haven't tried this yet, but it would a great convenience for casual observing: all the benefits of the goto features without the hassle of a precision polar alignment. As an alternative, if your polar alignment is very rough, Roland suggested using the Tour to align on the brightest star in a constellation; you will then be able to goto other objects in the constellation with a wide-angle eyepiece, even if polar alignment is quite bad. In effect, you've got a "local" alignment that suffices for observing in a small area of the sky. If you move to another area, a quick recalibration for that constellation should do the trick. Next time I am out observing, I will take detailed notes on how this works and post them. I'm in Seattle, so who knows when that will be; if someone does it first, my heart will survive. <g> Ron Wodaski -----Original Message-----
From: Jeffrey D. Gortatowsky [mailto:mrrockets@...] Sent: Tuesday, April 11, 2000 7:39 PM To: ap-gto@... Subject: Re: [ap-gto] slewing sound level Rich, I ditched a message that had the exact same tone as yours. After rereading the original I realized whomever it was posting (grayfox65?) was trying to get way more precision than I currently need. I mean it was _great_ to get all this information, and I did file it away, but I was thinking to myself: "Hello! I just want to slew and have the object in the FOV of a 31mm Terminagler, not a 2.5mm LV with a 5x PowerMate! :^D Can't I do a quick two star alignment and start observing? Then maybe refine the mount's error by using a synchronize command?" However reading the entire message again I see that is exactly the case. So I trashed the email. I think we are talking about two different criteria for pointing accuracy here. Me thinks grayfox65 wants to put it on a CCD chip or somptin' like that. Or I could just be out in left field. Clear skies, Jeff ----- Original Message ----- From: "Rich N." <rnapo@...> To: <ap-gto@...> Sent: Tuesday, April 11, 2000 7:00 PM Subject: [ap-gto] slewing sound level <snip> Maybe I need to read more about using the AP software, ------------------------------------------------------------------------ Chocolate eggs, tulips, bunnies and more... Click Here http://click.egroups.com/1/3120/3/_/3615/_/955507429/ ------------------------------------------------------------------------ |
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Jeffrey D. Gortatowsky <mrrockets@...>
Rich,
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I ditched a message that had the exact same tone as yours. After rereading the original I realized whomever it was posting (grayfox65?) was trying to get way more precision than I currently need. I mean it was _great_ to get all this information, and I did file it away, but I was thinking to myself: "Hello! I just want to slew and have the object in the FOV of a 31mm Terminagler, not a 2.5mm LV with a 5x PowerMate! :^D Can't I do a quick two star alignment and start observing? Then maybe refine the mount's error by using a synchronize command?" However reading the entire message again I see that is exactly the case. So I trashed the email. I think we are talking about two different criteria for pointing accuracy here. Me thinks grayfox65 wants to put it on a CCD chip or somptin' like that. Or I could just be out in left field. Clear skies, Jeff ----- Original Message -----
From: "Rich N." <rnapo@...> To: <ap-gto@...> Sent: Tuesday, April 11, 2000 7:00 PM Subject: [ap-gto] slewing sound level <snip> Maybe I need to read more about using the AP software, |
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Rich N. <rnapo@...>
Last weekend was the first time I tried slewing
my AP 900GTO mount. I was a little surprised at the noise level when slewing at 1200 and 900. A friend was using his 1200GTO the same night and it gave virtually the same sound on the 1200 setting. It made me wonder long the gears and motors would last slewing like that. I'm sure it will hold up well. I didn't try any lower settings. Maybe they are quite a bit quieter? Sorry to say the Nexstar 5s and 8s are quieter. Although I'm sure they are not as accurate or as rugged as the AP mounts. Maybe I need to read more about using the AP software, but, having to make a number of passes between Polaris and another star to polar align seems like a lot of work if you are not trying to take long exposure astro photos. Rich |
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