HI Rick: For humidity control in other applications I have used Zip-Lok bags. How about putting the 10811 in a Zip-Lok bag and run the wires through a hole that gets epoxy sealed? Some desiccant would lower the humidity if that is an advantage.
Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Richard (Rick) Karlquist wrote: >>Given that HP's engineers have done such a good job with >>the oven and oscillator design, is there anything to be gained >>by adding extra thermal insulation (lagging)? How much >> >> > >Not a good idea. The best thing you could do to improve >temp stability of a 10811 is to tweak the resistors that >proportion the power between the two heater transistors. >At some ratio, the thermal gain will peak at over 1000 >typically. If you just take pot luck, you would be lucky >to do 100. You are still limited by the tempco of the >electronics, no matter what thermal gain you achieve at >the crystal. > >You should also be aware that the 10811 is fairly humidity >sensitive, which can seem like temperature sensitivity >if the humidity and temperature change together. > >The HP E1938 was a much better design in terms of environmental >insensitivity, but that didn't help much because the >ultimate stability was limited by crystal frequency jumps, >which didn't seem so bad with the 10811 due to the large >environment errors in it. In the E1938 they stuck out like >a sore thumb. > >Rick Karlquist N6RK > > >_______________________________________________ >time-nuts mailing list >time-nuts@febo.com >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts