jmfranke wrote: > 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 >
"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: http://www.karlquist.com/oven.pdf We eventually demonstated thermal gain of over a million. Again, for just a crystal. Rick Karlquist N6RK _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.