VintageBigBlue.org

 

Re: PEC with autoguider problem


Aug 3, 2004

 


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

#21801 Aug 3, 2004

Hi All

I've had the mount about a month now and it sure is a fine cloud

magnet :.(



I'm running the G11 with Gemini 3 with a FS102 & FS60 on board

MX7c using Astroart3 with the ASCOM driver into the RS232 port

The Gemini was running at photo mode using .3, .5 & .8

We got a few hours of semi clear skies and I tried to PEC the mount

with the MX7c and when I ran it back it seemed to have overcorrected

it

If fact it is better without PEC



Has anybody sucessfully done PEC with the SX 2k unit or any other

ccd and if so how did you manage it?



Thanks in advance



Steve



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

#21802 Aug 3, 2004

Hi,



PEC is a cyclic correction independent from the atmosphere, alignement

accuracy, etc.



While the ccd camera autoguiding (I suppose the camera also provide a

guiding function) is a real time process linked to the above mentioned

factors.



Could it be that both correction systems enter in conflict in some

conditions?



Regards



Claudio



--- In Losmandy_users@yahoogroups.com, "Steve Ibbotson" heleni@b...>

wrote: > Hi All

> I've had the mount about a month now and it sure is a fine cloud

> magnet :.(

>

> I'm running the G11 with Gemini 3 with a FS102 & FS60 on board

> MX7c using Astroart3 with the ASCOM driver into the RS232 port

> The Gemini was running at photo mode using .3, .5 & .8

> We got a few hours of semi clear skies and I tried to PEC the mount

> with the MX7c and when I ran it back it seemed to have overcorrected

> it

> If fact it is better without PEC

>

> Has anybody sucessfully done PEC with the SX 2k unit or any other

> ccd and if so how did you manage it?

>

> Thanks in advance

>

> Steve



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

#21804 Aug 3, 2004

Hi Claudio

Thanks

I understand the PEC function is cyclic and if the seeing is s***

there is no point in even trying to correct it

but the autoguider was turned off after I had done the training so I

could determine if the corrections worked so no conflict

and it was much worse than without PEC enabled



also if I use the Starlight guiding system and image at the same

time it works great (nice tight stars compared to the Meade mount

which did its job for the price) but I lose half the exposure to the

guiding and get the amp glow associated with the system



having reread the manual again regarding PEC I might have to throw

in some time lag factor from the actual PE being recognised by me or

PC and then being sent back to the mount to be corrected but I can't

see this as being that much of a factor



sorry if that does not read well but I know what I mean



Cheers

Steve





--- In Losmandy_users@yahoogroups.com, "schinazic"

claudio.schinazi@s...> wrote: > Hi,

>

> PEC is a cyclic correction independent from the atmosphere,

alignement > accuracy, etc.

>

> While the ccd camera autoguiding (I suppose the camera also

provide a > guiding function) is a real time process linked to the above

mentioned > factors.

>

> Could it be that both correction systems enter in conflict in some

> conditions?

>

> Regards

>

> Claudio

>

> --- In Losmandy_users@yahoogroups.com, "Steve Ibbotson"

heleni@b...> > wrote:

> > Hi All

> > I've had the mount about a month now and it sure is a fine cloud

> > magnet :.(

> >

> > I'm running the G11 with Gemini 3 with a FS102 & FS60 on board

> > MX7c using Astroart3 with the ASCOM driver into the RS232 port

> > The Gemini was running at photo mode using .3, .5 & .8

> > We got a few hours of semi clear skies and I tried to PEC the

mount > > with the MX7c and when I ran it back it seemed to have

overcorrected > > it

> > If fact it is better without PEC

> >

> > Has anybody sucessfully done PEC with the SX 2k unit or any

other > > ccd and if so how did you manage it?

> >

> > Thanks in advance

> >

> > Steve



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

#21808 Aug 4, 2004

Steve,



Am I right to understand you trained the PEC while the autoguider was

on or to be more precise that the autoguider trained the PEC?



If so, I'm not sure to be able to express it properly, but I would

say you would lure the PEC by training with corrections that are not

the result of ONLY periodic error.



Regards



Claudio



--- In Losmandy_users@yahoogroups.com, "Steve Ibbotson" heleni@b...>

wrote: > Hi Claudio

> Thanks

> I understand the PEC function is cyclic and if the seeing is s***

> there is no point in even trying to correct it

> but the autoguider was turned off after I had done the training so

I > could determine if the corrections worked so no conflict

> and it was much worse than without PEC enabled

>

> also if I use the Starlight guiding system and image at the same

> time it works great (nice tight stars compared to the Meade mount

> which did its job for the price) but I lose half the exposure to

the > guiding and get the amp glow associated with the system

>

> having reread the manual again regarding PEC I might have to throw

> in some time lag factor from the actual PE being recognised by me

or > PC and then being sent back to the mount to be corrected but I

can't > see this as being that much of a factor

>

> sorry if that does not read well but I know what I mean

>

> Cheers

> Steve

>

>

> --- In Losmandy_users@yahoogroups.com, "schinazic"

> claudio.schinazi@s...> wrote:

> > Hi,

> >

> > PEC is a cyclic correction independent from the atmosphere,

> alignement

> > accuracy, etc.

> >

> > While the ccd camera autoguiding (I suppose the camera also

> provide a

> > guiding function) is a real time process linked to the above

> mentioned

> > factors.

> >

> > Could it be that both correction systems enter in conflict in some

> > conditions?

> >

> > Regards

> >

> > Claudio

> >

> > --- In Losmandy_users@yahoogroups.com, "Steve Ibbotson"

> heleni@b...>

> > wrote:

> > > Hi All

> > > I've had the mount about a month now and it sure is a fine

cloud > > > magnet :.(

> > >

> > > I'm running the G11 with Gemini 3 with a FS102 & FS60 on board

> > > MX7c using Astroart3 with the ASCOM driver into the RS232 port

> > > The Gemini was running at photo mode using .3, .5 & .8

> > > We got a few hours of semi clear skies and I tried to PEC the

> mount

> > > with the MX7c and when I ran it back it seemed to have

> overcorrected

> > > it

> > > If fact it is better without PEC

> > >

> > > Has anybody sucessfully done PEC with the SX 2k unit or any

> other

> > > ccd and if so how did you manage it?

> > >

> > > Thanks in advance

> > >

> > > Steve







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

#21809 Aug 4, 2004

Hi

You are correct

autoguider trained



I would not expect it to be worse by a factor of 3 even with 1 run



Steve





snip



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