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Re: Meridian Flip

 

Hi.

This,hapoens,can means your T pointing model is messed up.

It happens because of the way the Gemini extracts the model parameters in sequence.? It seems it cannot do a multidimensional least squares fit ...so it gets certain values first, then estimates the next most critical ones. ? You must follow the procedure somewhere in the manual, like:

(My uppercase text is not really shouting...I apologize!)

Cold boot (zeros out the pointing model values in the Gemini).

Align to 3 stars on only one side of the meridian.

Align to 3 more stars on the other side if the meridian. ?

Your model should be good...next Gotos should be accurate.

--- other things that can get you ------

If you are connected to a PC, use Gemini.net...carefully:

Disconnect the Gemini from the PC, but boot up the Gemini.net applet. Let it say, "not connected."

Un-check the tick box: (something like:) "Send from PC to Gemini on connect". ?(Top right tick box on the Advanced screen...I think.)

Now connect the Gemini to the PC.

Read back the Gemini box internal model parameters.? Look at them.? They should be pretty low....not zero but reasonably low. ?

Save the model into a backup file on your PC.? Give it a unique name not the default name.? I use like "G11-Gemini1-good-Aug-15-2017" .

Then you can re-check the tick box "Send to Gemini on connect".? Now your time/date/Lat/Long, etc will be sent. ?

If you use 2 or more mounts with 1 Gemini, and one laptop, this gets tricky!? Worse if the mounts are different type like G11 vs GM8....(yes...that's my case).? You must be sure your Gemini Settings match the mount... worth double checking.

All the best,
Michael?




On Aug 15, 2017 06:41, "sactowriter@... [Losmandy_users]" <Losmandy_users@...> wrote:
?

Hi everyone,

First of all, I?d like to report that since your help with guiding, the guiding on my G11 has been superb, running close to a half an arc second.?


Another issue has popped up. For weeks, i have had very few problems with meridian flips. I would get everything setup and purring and in the morning, I would get up and everything would have functioned normally with meridian flip happening as it should. In the last three nights that has changed. Two of those nights the meridian flip failed with my telescope pointed to ?the same place at the ground. One night in between those two nights it worked fine. All three nights were shooting the same target. I am using SGPro to guide the camera and the mount. The only thing that I can think of that is different in the three nights is on the night that worked fine, I did a cold start and rebuilt the model. In the past I've been able to use warm restart from CWD position with no problem. My mount during the summer months stays set up in my back yard. Any thoughts on what might be causing this?


Rob
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