I also have the GM100 and ST-4 and do not use the PEC. It seems to
work fine without it.
--- In Losmandy_users@..., 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@...
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
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