[time-nuts] Crystal ovens

jmfranke jmfranke at cox.net
Wed Jun 10 18:03:13 EDT 2009


There was an interesting paper by W. A. Morrison (made the first crystal 
controlled clock) in the July 1928 issue of Proceedings of The Institute of 
Radio Engineers, pages 976-980, entitled "Thermostat Design for Frequency 
Standards."
The article describes a crystal oven consisting of four layers: starting at 
the outer wall - a layer of insulation, a heater, a distributing layer, and 
an attenuating layer.  He described a case wherein the temperature variation 
is reduced by a factor of "at least 10,000 to one."

Of course this was for a passive crystal versus an active oscillator.

John  WA4WDL 





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