Re: [APML] st-4 acting up

["Bobby Middleton" <bobm@koyote.com>]

Thanks for the ideas guys.

Jim I tend to agree with you that this might be a cool-down issue since it
appears to reach an equilibrium eventually.

Gene I've never used the st-4 on the computer but it's thought I might try.

As for frosting; the first thing I did was re-bake the dessicant ring and
let the st-4 head lay out in the mid-morning sun to try and purge any
moisture from the head. Frosting usuallty equates to lowered sensitivity.
I'm getting inconsistant brightness readings. First very low sensitivity
then it finally appears to kick in to normal operation with more dark
frames.

Philip, your ideas are certainly worth looking into especially since the
st-4 head and CPU have been in an often damp and spidery observatory for
several years. Those spiders can get tiny webs into lots of places. I'll dog
to find that bridge rectifier yyou mention and give the thing a good
once-over. I do have one or two keypads on the CPU that are a bit hard to
make connection when pressed.

----- Original Message ----- 
From: "Jim Janusz" <jjanusz@dc.rr.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Wednesday, July 14, 2004 11:13 PM
Subject: Re: [APML] st-4 acting up


> Hi Bobby,
>
> My best guess is that you overwhelmed the cooler in the ST-4.  It seems
like
> it took a long time to get down to temperature and then started working.
>
> Just a guess....
>
> Jim
> ----- Original Message ----- 
> From: "Bobby Middleton" <bobm@koyote.com>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Wednesday, July 14, 2004 8:03 PM
> Subject: [APML] st-4 acting up
>
>
> > It looks like my st-4 is needing several dark frames to settle down
where
> it
> > can make true readings. This is after a 30 min+ start-up. It's warm here
> in
> > TX (90 deg at sundown) if that has anything to do with it. It's never
been
> a
> > problem before during the heat.
> > Anybody seen this behavior and can you tell me what's going on?
> > I had this problem the other night and finally got it settled down where
> it
> > worked OK all night. I took 3-4 dark frames tonight beforte it settled
> down
> > to good readings.
> > Bobby Middleton
> >
> >
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> >
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>
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