Re: [APML] ST4 power requirements???

["joe" <jmize@svic.net>]

Scott;

     If you already have an old battery and AC get a Battery Tender trickle 
charger and leave it attached all the time.  I use and old Radio Shack 3A 
12VDC power supply for the ST-4 and a separate Pyrimid 12VDC 5/7A for the 
mount.  I've never had a problem...joe  :)

http://www.batterystuff.com/productdisplay.html?id=327&c=80&f=Battery_Tender_Plus_Smart_Charger



"May You Go Among The Imperishable Stars"

Joe Mize:     jmize@svic.net
StarFields Observatory   http://www.cav-sfo.com
Chiefland, FL    29:24'33.4"N    82:51'37.7"W
Moon Phase:     http://tycho.usno.navy.mil/cgi-bin/phase.gif

----- 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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