[time-nuts] Poor man's oven

Bob kb8tq kb8tq at n1k.org
Tue Jun 6 06:48:14 EDT 2017


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. 


> On Jun 6, 2017, at 12:13 AM, David <davidwhess at 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
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