On Tuesday, December 30, 1997 2:12 PM, Bill Arnett wrote:

> >On Tuesday, December 30, 1997 6:58 AM, Paul Goelz wrote:
> >>... a good product for anyone out there to develop would be a dew
> >> heater assembly that measure ambient and automatically adjusts to give a
> >> stable delta T above ambient for the center of the corrector. Maximum dew
> >> prevention with minimum heat and power. Any takers?
> >
> >This has been done for the Newtonian secondary mirror...
>
> Protostar has such a unit:
> http://www.fpi-protostar.com/special.htm

I remember now, the one I looked was for a Newtonian diagonal from
AstroSystems:

http://www.frii.com/~astrosys/dewgrd.htm


> >I believe Bill Arnett said he had a prototype circuit for doing this, perhaps
> >Bill will pursue this as an efficient heater is quite important with limited
> >available power. Maybe Bill will develop this and sell it to us.
>
> I do have a circuit that a friend of mine drew up. It needs a little
> modification to handle the large power requirements of an SCT corrector. I
> haven't yet built it. If I do, I will make a WWW page with all the gory
> details. (But don't hold your breath, I'm swamped with other stuff to do.)
>
> ---
> Bill Arnett "Science is a way of trying
> San Jose, CA USA not to fool yourself." -- Feynman
>
>
>


--
Michael Hart
Husen Observatory

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