RE: [APML] ST4 power requirements???

["Scott Hammonds" <shammonds@creatorsview.com>]

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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