[time-nuts] Temperature controlled TCVCXO

jmfranke at cox.net jmfranke at cox.net
Fri May 13 10:05:02 EDT 2016


A problem I had with TE heater coolers was condensation when the ambient temperature was higher than the TE temperature. I was trying to operate the crystals on the lower temperature inflection point. After a while, corrosion became a major issue. 

John  WA4WDL

---- 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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