[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
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
>
>
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo