Re: [APML] ST4 power requirements???

["Stuart Heggie" <Stuart.J.Heggie@sympatico.ca>]

Kind of where I came out - a new battery looks pretty cheap compared to a
night in the freezing cold getting nothing but crazy looking guiding because
the dew heaters keep coming on and off and messing up the ccd.

Stuart
----- Original Message ----- 
From: "Scott Hammonds" <shammonds@creatorsview.com>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Saturday, April 16, 2005 10:57 AM
Subject: RE: [APML] ST4 power requirements???


> OK, Thanks Bill and Stuart for making me paranoid again!!! <g> I haven't
had
> any real problems in the past running the ST4 on the same power source as
> dew heaters, but I've heard of problems recently from others. Oh what the
> heck, I'll buy a separate power source for the dew heaters, after all it's
> only money...
>
>
> Scott Hammonds
> www.creatorsview.com
>
> -----Original Message-----
> From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On
> Behalf Of Stuart Heggie
> Sent: Saturday, April 16, 2005 9:29 AM
> To: Discussion of Film Astrophotography
> Subject: Re: [APML] ST4 power requirements???
>
> Bill - I think you are right - I was having all sorts of trouble with my
> autoguiding when I was running the dew heaters from the same power source.
> In fact, I run everything on AC except my dew heaters which I run off a
> Kendrick battery so that the dew heater is isolated.
>
> Stuart
> ----- Original Message -----
> From: "William R. Mattil" <wrmattil@ix.netcom.com>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Saturday, April 16, 2005 9:21 AM
> Subject: Re: [APML] ST4 power requirements???
>
>
> > Scott Hammonds wrote:
> >
> > >Alan, Jerry,
> > >That was the answer I was looking for!! Thanks a ton. The total amp
draw
> for
> > >the ST4 and my 3 small dew heater straps is about 3.5 amps - 4 amps, so
> > >there "shouldn't" be a problem.
> > >
> > >
> > >
> > >
> >
> > Scott,
> >
> > Regardless of the situation I would *never* run dew heaters and the
> > Mount or Autoguider from the same supply. In my opinion thats asking for
> > trouble. The typical Dew Heater "cycles" and its current draw isn't
> > constant aring a period of high current consumption intermittant guiding
> > problems can occur. Feel free to try this of course .... But my
> > philosophy is that a 1.5A supply for the Dew Equipment is cheap
> > insurance. Some time spent with an O-Scope and different Power Supplies
> > and loads would convince you that not all power supplies are created
> > equal. Most of them, risky assumption I know, will crowbar and drop
> > current capability when its threshold is met. This can create some
> > serious guiding issues. I have enough guiding issues as it is :( Let
> > alone the thought of wasting a clear night fooling with it.
> >
> >
> > Regards
> >
> > Bill
> >
> >
> >
> >
> >
> > -- 
> >
> > William R. Mattil : http://www.celestial-images.com
> >
> >
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