[time-nuts] Temperature controlled TCVCXO

[Nathan Johnson]

Can you elaborate just a little bit on "poor"? Is that due to the "flat 
points" or desired temps always being elevated above most sane ambient 
temps? Or just that temp control via TEC isn't as precise?
Nathan KK4REY

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On Fri, May 13, 2016 at 06:37, Bob Camp <kb8tq at n1k.org> wrote:
Hi

Yes, it can be done. The performance will be poor, but it will work.

Bob

 > On May 13, 2016, at 4:15 AM, David <davidwhess at gmail.com> wrote:
 >
 > Has anybody tried using a thermoelectric cooler to maintain a TCVCXO
 > at a constant temperature in lieu of using an OCXO?
 >
 > I was thinking about this after reading some application notes in
 > connection with constant temperature control using TECs with bipolar
 > drive. The power required would be pretty low so I think a linear
 > control circuit could be used avoiding the noise problems associated
 > with a switching controller. Temperature sensor placement would be a
 > challenge.
 >
 > I suppose as part of an automated calibration, the temperature could
 > be adjusted over a few degrees from ambient to find any flat spots in
 > the oscillator's ppm/C curve.
 >
 > One place I have run across this application of TECs is with laser
 > diodes where coherence length depends on very tight temperature
 > control. Typical laser diodes without temperature control have a
 > coherence length of millimeters making them useless in more demanding
 > applications like interferometry.
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