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Re: Pempro curve after it´s loaded to G11


Dec 1, 2009

 


----------------------------

#44486 Dec 1, 2009

Hi !

for the 5th or maybe 6th time I measured PE with Pempro, 8 worm periods, and downloaded into G11/Gemini.

PEC varied between +4,8 to -4,7 without PEC but as usual when I use a new downloaded PEC curve the PE gets worse. Usually about +7/9 to - 7/9. I tried to invert but it didn.t help.

This has happened many times for me and it.s very frustrating !

I use 0,5 guide rate and the mount is on a pier and very well polaraligned.

The downloaded PEC curve varied between +3,1 to - 4,1



Another question that is a bit confusing is that when you create a PEC curve and load it into the mount how does Gemini syncronize the correction to the wormwheel when the mount has been tracking during creation and downloading of the PEC curve ? Say the procedure has taken 1 minute and meanwhile the G11 continued tracking.



Hope someone can help me out !



Cheers

Timo



----------------------------

#44487 Dec 1, 2009

Hi Timo,



Did you do a full calibration wizard run prior to measuring/prgramming PEC? If so, and if PE doubles after programming with PemPro, inverting the curve and re-programming is the answer.



Make sure you have the correct mount type selected in Gemini and use Gemini Level 4 mount type in PemPro.



Pempro is aware of Gemini PEC index value which tells it exactly at what position the worm is at while measuring PE. Then, when programming PEC, PemPro tells Gemini the actual index value and the correction needed at that position of the worm wheel. It doesn't matter what the worm is doing at the time.



Regards,



-Paul



--- In Losmandy_users@yahoogroups.com, "timoeric" mybrightstar@...> wrote:

>

> Hi !

> for the 5th or maybe 6th time I measured PE with Pempro, 8 worm periods, and downloaded into G11/Gemini.

> PEC varied between +4,8 to -4,7 without PEC but as usual when I use a new downloaded PEC curve the PE gets worse. Usually about +7/9 to - 7/9. I tried to invert but it didn.t help.

> This has happened many times for me and it.s very frustrating !

> I use 0,5 guide rate and the mount is on a pier and very well polaraligned.

> The downloaded PEC curve varied between +3,1 to - 4,1

>

> Another question that is a bit confusing is that when you create a PEC curve and load it into the mount how does Gemini syncronize the correction to the wormwheel when the mount has been tracking during creation and downloading of the PEC curve ? Say the procedure has taken 1 minute and meanwhile the G11 continued tracking.

>

> Hope someone can help me out !

>

> Cheers

> Timo

>



----------------------------

#44490 Dec 2, 2009

OK Ray !

I.ll try again and hopefully everything goes well.

Otherwise I join the PemPro forum and post my log files there.

Redards

Timo



--- In Losmandy_users@yahoogroups.com, "Ray Gralak \(Yahoo Groups\)" yahoo@...> wrote:

>

> Hi Timo,

>

> > Thanks Paul,

> > OK I.ll try again.

> >

> > I have changed the gearboxes so in Gemini it says MI250 and in Pempro Gemini Level 4. But this is OK from what I

> heard.

> >

> > But when programming Gemini should I use "Current PEC table" or "Saved PEC table" ?

>

> You should use "Current PEC table".

>

> > About the index value - if I start a new imaging session next day and before I power up Gemini I point the telescope,

> by hand, to the

> > pole, does this "destroy" the programming in Gemini ?

>

> I believe that if you have 1.04 (or later) firmware then the PEC Index will be restored correctly.

>

> Timo, if you still have problems getting the PEC to work please post your PEMPro log files (before and after PEC

> correction) either to the files section here or to the CCDWare PEMPro support forum (you can easily get to the PEMPro

> forum from the Help menu in PEMPro).

>

> Thanks,

>

> -Ray Gralak

> Author of PEMPro

>



----------------------------

#44491 Dec 2, 2009

Hi Timo,

> I have changed the gearboxes so in Gemini it says MI250 and in Pempro Gemini Level 4. But this is OK from what I heard.



Should be OK if you do a proper calibration in PemPro.

> But when programming Gemini should I use "Current PEC table" or "Saved PEC table" ?



Current PEC table is what's used by Gemini to make real-time corrections, so definitely program Current PEC. Saved PEC is just a backup copy.

> About the index value - if I start a new imaging session next day and before I power up Gemini I point the telescope, by hand, to the pole, does this "destroy" the programming in Gemini ?



As Ray pointed out, if your Genini is L4 v1.04 or later, then your PEC programming will not be affected by power down or manual moves. Previous versions of Gemini lost track of PEC index after power-down.



Regards,



-Paul



----------------------------

#44497 Dec 4, 2009

Thanks Paul !



I forgot to mention that I use a fl at 1800 mm for the moment but sometimes without reducer it is 2990 mm.

So it is a "sensitive" set up at least at 2990 mm. (Cassegrain)



Feels good to know that the PEC index is "saved and secured" after a download.



Regards

Timo

--- In Losmandy_users@yahoogroups.com, "paulkccd" pkane2001@...> wrote:

>

> Hi Timo,

>

> > I have changed the gearboxes so in Gemini it says MI250 and in Pempro Gemini Level 4. But this is OK from what I heard.

>

> Should be OK if you do a proper calibration in PemPro.

>

> > But when programming Gemini should I use "Current PEC table" or "Saved PEC table" ?

>

> Current PEC table is what's used by Gemini to make real-time corrections, so definitely program Current PEC. Saved PEC is just a backup copy.

>

> > About the index value - if I start a new imaging session next day and before I power up Gemini I point the telescope, by hand, to the pole, does this "destroy" the programming in Gemini ?

>

> As Ray pointed out, if your Genini is L4 v1.04 or later, then your PEC programming will not be affected by power down or manual moves. Previous versions of Gemini lost track of PEC index after power-down.

>

> Regards,

>

> -Paul

>







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