VintageBigBlue.org

 

Re: PEC and autoguiding [was: Recent 4" Tak Images]


Aug 5, 2000

 


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

#85 Aug 5, 2000

Years ago, I was a subscriber to the APML list. Most folks there suggested

that I leave PEC turned off when autoguiding- let the autoguider take care

of all corrections. That's how I currently use my GM100 mount and ST4.



Paul Sterngold



--- Julie and Tom Carrico carrico@...> wrote: > Hi Greg,

> I do not use the King tracking rate. My impression was it works for

> low to the horizon shots. Since I do not have a complete understanding

> of it, I have never tried it.

> I have not tried the PEC, but I am thinking about giving it a try to

> see if it provides any help. I am a little bothered by the fact that I

> would have to retrain it every time I use it, but if it works, it

> would be worth it.

>

> Tom C

>

>

>

> Greg Crawford wrote:

> >

> > Tom,

> >

> > After another night fine tuning my G11 I still have not achieved your

> > guiding error rate.

> >

> > So I'll keep trying. :-)

> >

> > Two more questions: Do you use the King tracking rate? Do you find that

> the

> > PEC helps?

> >

> > Greg Crawford

> >

> > > -----Original Message-----

> > > From: Julie and Tom Carrico [mailto:carrico@...]

> > > Sent: Saturday, 5 August 2000 12:53 AM

> > > To: Losmandy_users@egroups.com

> > > Subject: Re: [Losmandy_users] Recent 4" Tak Images from last

> > > weekend at

> > > ARGO

> > >

> > >

> > > Greg,

> > > The delay after correction (usually about .8 seconds) is absolutely

> > > required. Until I did that, my corrections were always in the .5 to 1

> > > pixel range. The mount was still responding to the prior move when

> the

> > > next guiding exposure was started.

> > > If I use a tracking rate of more than 2 seconds, and there is a

> change

> > > in RA and DEC (my minimum move times are usually .2 to .25 seconds),

> > > then it can be up to 2+.2+.2+.8+.8 = 4 seconds between corrections.

> > > This now starts to get kind of long. I have noticed that the way my

> > > drive works is that it hums along pretty well, and then has a jump of

> > > .7 or so pixels that is usually guided out on the next correction. If

> > > I wait too long between corrections, it will be too long before the

> > > error is guided out.

> > > I am still working with the drive. Since it is brand new, I have not

> > > yet taken it all apart for a cleaning as recommended by so many other

> > > G-11 motors. For the most part, I am very satisfied. The DSC are just

> > > great and the mount is well built.

> > >

> > > Tom C

> > >

> > > Greg Crawford wrote:

> > > >

> > > > Tom,

> > > >

> > > > +/- .2 pixels is excellent. Would you have obtained the

> > > same level of

> > > > guiding accuracy ifyou had exposed the tracking CCD for

> > > say, 2 secs, without

> > > > any delay?

> > > >

> > > > Greg Crawford

> > > >

> > > >

> > > >

> > > > To unsubscribe from this group, send an email to:

> > > > Losmandy_users-unsubscribe@egroups.com

> > >

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

> > > ------e|-

> > > Free Conference Calling with Firetalk!

> > > Click Here!

> > > click.egroups.com/1/5480/5/_/_/_/965400714/

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

> > > ------|e>-

> > >

> > > To unsubscribe from this group, send an email to:

> > > Losmandy_users-unsubscribe@egroups.com

> > >

> > >

> > >

> > >

> >

> >

> >

> > To unsubscribe from this group, send an email to:

> > Losmandy_users-unsubscribe@egroups.com

>





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

#87 Aug 5, 2000

I also have the GM100 and ST-4 and do not use the PEC. It seems to

work fine without it.



--- In Losmandy_users@egroups.com, Paul Sterngold psterngold@y...>

wrote: > Years ago, I was a subscriber to the APML list. Most folks there

suggested > that I leave PEC turned off when autoguiding- let the autoguider

take care > of all corrections. That's how I currently use my GM100 mount and

ST4. >

> Paul Sterngold

>

> --- Julie and Tom Carrico carrico@p...> wrote:

> > Hi Greg,

> > I do not use the King tracking rate. My impression was it works

for > > low to the horizon shots. Since I do not have a complete

understanding > > of it, I have never tried it.

> > I have not tried the PEC, but I am thinking about giving it a

try to > > see if it provides any help. I am a little bothered by the fact

that I > > would have to retrain it every time I use it, but if it works, it

> > would be worth it.

> >

> > Tom C

> >

> >

> >

> > Greg Crawford wrote:

> > >

> > > Tom,

> > >

> > > After another night fine tuning my G11 I still have not

achieved your > > > guiding error rate.

> > >

> > > So I'll keep trying. :-)

> > >

> > > Two more questions: Do you use the King tracking rate? Do you

find that > > the

> > > PEC helps?

> > >

> > > Greg Crawford

> > >

> > > > -----Original Message-----

> > > > From: Julie and Tom Carrico [mailto:carrico@p...]

> > > > Sent: Saturday, 5 August 2000 12:53 AM

> > > > To: Losmandy_users@egroups.com

> > > > Subject: Re: [Losmandy_users] Recent 4" Tak Images from last

> > > > weekend at

> > > > ARGO

> > > >

> > > >

> > > > Greg,

> > > > The delay after correction (usually about .8 seconds) is

absolutely > > > > required. Until I did that, my corrections were always in

the .5 to 1 > > > > pixel range. The mount was still responding to the prior move

when > > the

> > > > next guiding exposure was started.

> > > > If I use a tracking rate of more than 2 seconds, and there is

a > > change

> > > > in RA and DEC (my minimum move times are usually .2 to .25

seconds), > > > > then it can be up to 2+.2+.2+.8+.8 = 4 seconds between

corrections. > > > > This now starts to get kind of long. I have noticed that the

way my > > > > drive works is that it hums along pretty well, and then has a

jump of > > > > .7 or so pixels that is usually guided out on the next

correction. If > > > > I wait too long between corrections, it will be too long

before the > > > > error is guided out.

> > > > I am still working with the drive. Since it is brand new, I

have not > > > > yet taken it all apart for a cleaning as recommended by so

many other > > > > G-11 motors. For the most part, I am very satisfied. The DSC

are just > > > > great and the mount is well built.

> > > >

> > > > Tom C

> > > >

> > > > Greg Crawford wrote:

> > > > >

> > > > > Tom,

> > > > >

> > > > > +/- .2 pixels is excellent. Would you have obtained the

> > > > same level of

> > > > > guiding accuracy ifyou had exposed the tracking CCD for

> > > > say, 2 secs, without

> > > > > any delay?

> > > > >

> > > > > Greg Crawford

> > > > >

> > > > >

> > > > >

> > > > > To unsubscribe from this group, send an email to:

> > > > > Losmandy_users-unsubscribe@egroups.com

> > > >

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

> > > > ------e|-

> > > > Free Conference Calling with Firetalk!

> > > > Click Here!

> > > > click.egroups.com/1/5480/5/_/_/_/965400714/

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

> > > > ------|e>-

> > > >

> > > > To unsubscribe from this group, send an email to:

> > > > Losmandy_users-unsubscribe@egroups.com

> > > >

> > > >

> > > >

> > > >

> > >

> > >

> > >

> > > To unsubscribe from this group, send an email to:

> > > Losmandy_users-unsubscribe@egroups.com

> >

>

>

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> Kick off your party with Yahoo! Invites.

> invites.yahoo.com/







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