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 <tsho...@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 <cjaysh...@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 <step...@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 > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- time-nuts@febo.com > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > >> mailman/listinfo/time-nuts > >>> and follow the instructions there. > >>> > >> > >> -- > >> Stephen Tompsett > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to https://www.febo.com/cgi-bin/ > >> mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > > > > > > > -- > > Clint. > > > > *No trees were harmed in the sending of this mail. However, a large > number > > of electrons were greatly inconvenienced.* > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.