[time-nuts] Crystal ovens
richard at karlquist.com
Wed Jun 10 22:16:22 UTC 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
> Radio Engineers, pages 976-980, entitled "Thermostat Design for Frequency
> The article describes a crystal oven consisting of four layers: starting
> the outer wall - a layer of insulation, a heater, a distributing layer,
> an attenuating layer. He described a case wherein the temperature
> 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
"10,000 to one" (thermal gain = 10,000) is very good. We
could not achieve that until we applied the techiques in
the following reference:
We eventually demonstated thermal gain of over a million.
Again, for just a crystal.
Rick Karlquist N6RK
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