Just to be clear here, my original question referred to using a TEC to maintain a constant temperature where the TCVCXO with the crystal has the best stability. I assume this would be around 25C but testing might reveal that it is actually more stable at a point slightly higher or lower.
So the TCXO would be operating at or around a fixed point near 25C whether the ambient temperature is higher or lower. Bidirectional control of the TEC with a servo amplifier is not difficult and that second HP link is pretty close to what I had in mind. On Fri, 13 May 2016 16:30:20 -0700, you wrote: >Hi Nathan, > >Let me state what Bob is driving at in a different way. > >Your biggest problem with a TCXO is the crystal. It is cut so that the >slope, relative to temperature, has the shallowest curve around room >temperature (between 20 to 25 degrees C). If you cool or heat it from >that range the slope becomes more radical. The more radical the slope >the greater the change in frequency for a given change in temperature. >The exact opposite of what is trying to be achieved. > >This translates into having to have an extremely tightly controlled oven >system in an attempt to overcome the radical slope. In addition you >will also have to consider the elevated temperature effects on the other >components. It is a never ending battle. > >Bill....WB6BNQ _______________________________________________ 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.
