You must be kidding. No way are Zip Lok bags hermetic. Water vapor will diffuse right through. (Note that waterproof does not equal hermetic).
Rick N6RK Brooke Clarke wrote: > 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 >>[email protected] >>https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >> >> > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
