[time-nuts] poor-man's oven
jimlux at earthlink.net
Sun Jun 4 08:13:18 EDT 2017
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
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
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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