[time-nuts] Poor man's oven

Bob kb8tq kb8tq at n1k.org
Mon Jun 5 07:09:47 EDT 2017


The posistor approach to heating a crystal was originally pioneered in Russia. Morion was 
building vacuum insulated / PTC controlled OCXO’s long before the PTC parts started showing
up more generally in the 1970’s. 


> On Jun 5, 2017, at 4:35 AM, Ulf Kylenfall via time-nuts <time-nuts at febo.com> 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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