Hi For a while, a couple of outfits made TO-5 and TO-8 “cap heaters” with PTC material. There are still a few obscure places that people do the same sort of thing with a mini-pcb based design. In an OCXO design, the gotcha is matching the PTC oven temperature to the crystal turn. You can do that if you have a substantial inventory of material and custom fab the oven after the crystal is bult.
Bob > On Jun 6, 2017, at 12:13 AM, David <davidwh...@gmail.com> wrote: > > I have never been able to find a reference to them on the internet but > there was a similar product intended for TO-99 packages that could be > used with operational amplifiers. > > On Mon, 5 Jun 2017 08:35:35 +0000 (UTC), you 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. _______________________________________________ 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.
