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 <[email protected]> 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) > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
