[time-nuts] poor-man's oven

[R. Kuehn]

Maybe you want to check out the work of Hans Summers he has done some
impressive low cost stuff:
http://www.hanssummers.com/ocxosynth.html
http://www.qrp-labs.com/ocxokit.html

Ralph

On Sun, Jun 4, 2017 at 07:19 jimlux <jimlux at earthlink.net> wrote:

> I recall some years ago folks were talking about putting a PTC
> thermistor on the TCXO of a FlexRadio SDR1000 to stabilize the frequency
> as a sort of poor-man's OCXO.
> It's also referenced at
> http://www.setileague.org/askdr/xtaloven.htm
> where he says "order of magnitude improvement" with no numbers (from 1%
> to 0.1% or from 1 ppb to 0.1 ppb?)
>
> I wonder how well that actually works.
>
> Say you bought an inexpensive (perhaps non TC) XO and an equally
> inexpensive thermistor, glued on on the other, hooked em both up to 3.3
> or 5V.
>
> Yeah, there's issues with room air blowing on it, and tolerances in both
> the XO and thermistor, so your absolute frequency accuracy may not be so
> hot. But what sort of medium to long term performance can one expect.
>
> I did some searches, because I'm sure we've discussed this before, but I
> couldn't find it.  There was some stuff from Oct 2007, but that was in
> the context of a more complex circuit, and the thermistor was the
> sensor. (discussions of TE devices too)
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