Re: Encoders, yes or no?
As would some other folks, but you have to convince Scott Losmandy to do that. Ideally this would require a new generation of Gemini (Gemini-3?) with the necessary additional hardware and firmware to
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David C. Partridge
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#83641
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Re: Undermounted?
Better! A bit of follow-up to my GM811G with poor Dec guiding for SVX140T:
I followed a few of the great suggestions, namely reducing the CW moment arm and Dec guiding aggressiveness.
i ordered a 21
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DaleN
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#83640
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Re: Encoders, yes or no?
I use my? upgraded 2010 Losmandy G11G for imaging. The wish list would be to improve guiding using absolute encoders.? If my understanding is correct, the E port on the Gemini-2 is not designed to
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Jim Bachesta
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#83639
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Re: Undermounted?
Yes, always do calibration and GA each run.
Dale
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DaleN
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#83637
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Re: Undermounted?
This can make all the difference. Seems more like a settings or software issue than
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John Kmetz
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#83636
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Re: Undermounted?
My setup is 27Lb, on a G11, and I have it balanced as best I can. I Keep the one 21Lb counterweight as high up as possible. It does seem to help. Same thing for me with NINA TPA and then PHD2 tells me
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David Malanick
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#83635
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Re: Undermounted?
Thank you Mark,
Yes, on this particular guiding session, I do recall Dec was almost perfectly balanced, rather than a little camera heavy. I was having a bit of trouble getting the balance correct
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DaleN
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#83634
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Re: Undermounted?
Thank you John,
These are also some of my thoughts. Moment-arm especially.
RA,Dec cables checked.
Dither is after 6-8 frames, and frequently is RA only, spiral. I have always (over the life of the
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DaleN
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#83633
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Re: Undermounted?
Thank you for the input! Inline answers:
In general, occasionally good (0.41" RA, 0.41" Dec, 0.59" RMS was best I've seen back in October 2024), mostly so-so to bad PE/guiding (0.8-1.2" RA and Dec,
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DaleN
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#83632
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Re: Undermounted?
Your DEC may be too perfectly balanced, and your polar alignment may be too good.
Seems contradictory but if there is any backlash in your DEC then every time you correct (say) a negative DEC error
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Mark Christensen
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#83631
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Re: Undermounted?
On Sun, Mar 2, 2025 at 11:25 PM, John Kmetz wrote:
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> Dale,
>
> This seems bizarre behavior. Dec (which should be in red) typically will
> drift in one direction if PA is off. If seeing is bad it
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Chip Louie
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#83630
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Re: Large Dec Backlash
Hi Ryan,? Did you get this resolved?? I'm seeing the same behavior - though not quite so bad.? I sent my mount back to Scott due to RA oscillations.? He was able to resolve this, and the mount
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carters@...
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#83629
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Re: Large Dec Backlash
On Thu, Jan 16, 2025 at 12:53 PM, crocco1250 wrote:
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> Hi Ryan,? Did you get this resolved?? I'm seeing the same behavior -
> though not quite so bad.? I sent my mount back to Scott due to RA
>
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carters@...
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#83628
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Re: Undermounted?
Dale,
This seems bizarre behavior. Dec (which should be in red) typically will drift in one direction if PA is off. If seeing is bad it should vary randomly. Having a repeating pattern I think is
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John Kmetz
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#83627
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Re: Undermounted?
Definitely not under mounted.? The generally used rules for determining imaging payload for commodity mounts do not apply to better mounts like Losmandy.? The GM811G has a stated saddle payload for
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Chip Louie
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#83626
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Edited
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Re: Undermounted?
Some questions for you.? First, w hat did the PE look like before it started to misbehave?? Generally when a system is guiding well it generally will continue to guide well until you change
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Chip Louie
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#83625
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Undermounted?
Hope I'm missing something obvious here, but my GM811 guiding has recently seemed impossible to get sorted. I have occasionally been able to achieve 0.5" guiding, but more typically 0.7"-1.2" with
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DaleN
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#83624
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Re: Pier side
Pier-side, at least its ASCOM definition, is based solely on the mechanical position of the Declination axis. When the scope passes through the celestial pole, the mount's pier-side changes. See
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Ray Gralak
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#83623
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Re: Pier side
Since a flip is simply a new GOTO after the target passes the meridian, if NINA and the mount do not agree that the target has indeed crossed the meridian the flip will fail.
In my case my failed
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Paul Goelz
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#83622
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Re: Pier side
https://gemini-2.com/limits.html
"Another way to think of the "side" of the pier that your scope is on -- it's the *side with the center of the saddle.* That seems obvious, but if your scope is long
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Ryan Noonan
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#83621
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