[time-nuts] Poor man's oven

Bob kb8tq kb8tq at n1k.org
Tue Jun 6 14:23:53 EDT 2017


As you point out, there really is no answer that is obviously better than all the others. 
If you keep the outside warm (say 40C) you will reduce the strain on the heater devices
and likely not degrade the MTBF of anything outside the OCXO by very much. 


> On Jun 6, 2017, at 7:26 AM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> --------
> In message <A9E08DB0-2CB4-46EE-BC6F-3F3F9BC65931 at n1k.org>, Bob kb8tq writes:
>> 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 built. 
> Bob, you of all people must be able to answer this:
> OCXO's have specified temperature ranges for instance
> -40...+70°C for the heavy duty stuff.
> But I cant imagine the ovens used are so perfect that they have the
> same regulation performance at all temperatures.
> I can choose the exterior temperature, which I should prefer ?
> Disregard aging of electronics and materials, we all know that
> stuff, what I'm interested in is at which exterior temperature
> OCXO ovens work best ?
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.

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