[time-nuts] Poor man's oven

[Adrian Godwin]

Wax is also used for thermostatic valves in engine cooling systems and
domestic heating systems.

On Mon, Jun 5, 2017 at 1:13 PM, Tim Shoppa <tshoppa at gmail.com> wrote:

> Here is a national new-technology of the art crystal oven from 1956:
>
> http://tf.boulder.nist.gov/general/pdf/1642.pdf
>
> Using the phase change properties of p-dibromobenzene it keeps temperature
> constant to 0.01C. It notes other organic compounds can be used for
> different temperature ranges.
>
> Did this oven technology ever get beyond lab use and into the real crystal
> oven world?
>
> I know in the past decade "thermowax" has been used in Honda lawnmower
> auto-chokes. I don't think it's ever supposed to be anything but solid, but
> it undergoes a phase change that causes it to expand by a large fraction.
>
> Tim N3QE
>
>
>
> Sent from my VAX-11/780
> > On Jun 5, 2017, at 5:16 AM, Clint Jay <cjaysharp at gmail.com> wrote:
> >
> > There's a few 'OCXO' designs out there, I'm not qualified to comment on
> the
> > timenutty quality of them but someone else mentioned Hans Summers
> offerings
> > and I would offer Roman Black's simple design (if it's not been mentioned
> > already):
> >
> > http://www.romanblack.com/xoven.htm
> >
> > I've no idea if it's useful but it's ridiculously simple to implement.
> >
> > Both Hans' and Roman's designs are 'on the list' of things to try for
> > myself at some point.
> >
> >> On 5 June 2017 at 09:56, Stephen Tompsett <stephen at tompsett.net> wrote:
> >>
> >> Not quite as simple as the PTC, an alternative may be:
> >>
> >> http://shop.kuhne-electronic.de/kuhne/en/shop/accessoires/
> >> crystal-heater/Precision+crystal+heater+40%C2%B0+QH40A/?card=724
> >>
> >> No it probably doesn't hold the crystal at it's optimum turn over
> >> temperature, but it will keep the temperature of a crystal approximately
> >> constant especially on a windswept hilltop.
> >>
> >>
> >>> On 05/06/2017 09:35, Ulf Kylenfall via time-nuts wrote:
> >>>  The Crystal heater clip wasa Murata "Posistor" soldered onto a clipand
> >> they were marketed by Murata.
> >>> I once purchased a small amount of theseand used them as "poor man's
> >> ovens".
> >>> Although not perfect by far, they did theirjob and kept my UHF gear
> >> stable.
> >>> Murata dropped that product many yearsago and I have not been able to
> >> findany similar product. The Posistors arelisted by eg. Digi-key but
> they
> >> do not stock them.
> >>> Ulf - SM6GXV
> >>>
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> >>
> >> --
> >> Stephen Tompsett
> >>
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> >>
> >
> >
> >
> > --
> > Clint.
> >
> > *No trees were harmed in the sending of this mail. However, a large
> number
> > of electrons were greatly inconvenienced.*
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