Re: [APML] A strange ST-4 behavior

["Massimo Costa" <mascosta@tiscali.it>]

Thanks you all for the suggestions, but this could be the real reason. In
fact, I use a separate 18 Volt battery for the Gemini pointing system and a
separate 12 Volt for Kendrick and St-4. That night I regulated the two dew
removers at minimum, so it is possible that the switch of temperature
regulation of the Kendrick was continuously switching on and off, dropping
the voltage under the minimum required. Maybe...
Thanks again
Massimo

----- Original Message -----
From: "Matthias Felsch" <mbox3@mfelsch.de>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, January 06, 2004 7:39 PM
Subject: Re: [APML] A strange ST-4 behavior


> I had a similiar behaviour of the ST4 once when the battery driving the
> ST4 AND a Kendrick dew remover was rather low.
> The (regulated) dew remover is alternately switched off and on by the
> control box to keep a certain temperature.
> On the other hand the ST4 is very critical with the voltage:
> it needs at least 12 volts, 11.7 is not enough.
> Now each time the dew remover was switched on, the
> voltage dropped slightly below 12 volts, so the ST4 stopped
> working, showing 0 0 0 . Some ten seconds later,
> the dew remover was turned off, the voltage jumped to above
> 12 volts and the ST4 continued working.
> And so on....
>
> Since that night my ST4 has a battery of it's own.
>
> Don't know if this is helpful
>
> Matthias Felsch
>

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