); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY At HP, in the 90's, we did a lot of brainstorming about vacuum ovens. This never seemed to make sense to us. If you actually achieve high amounts of thermal resistance, then you can't get the heat out of the oven. And if you don't, why bother with a vacuum. Also, a vacuum only helps if you do everything else you need to do to make a true Dewar (thermos bottle), like having mirrored surfaces, etc. Finally, having a vacuum means that nothing that outgasses can be used in the oscillator. Maybe Vectron has figured out something we didn't think of or has sufficiently difference constraints that a vacuum makes sense for them.
Rick Karlquist N6RK [EMAIL PROTECTED] wrote: > Today there are some interesting new technologies which allow small > double, > or even tripple (not sure if that makes sense) ovens to be built. Vectron > for > example just had a lead-article in RFDesign magazine introducing their > newest evacuated OCXO's. > > _http://rfdesign.com/vlf_to_uhf/time_and_frequency/709RFDF1.pdf_ > (http://rfdesign.com/vlf_to_uhf/time_and_frequency/709RFDF1.pdf) > > They claim stabilities on the order of 2E-07 over a very wide temp range > of > -40 to +85C in a DIP14 can. > > The 1/2 size DIP8 can is supposed to be available end of the year with > similar performance. > > Those small cans and wide operating ranges should make it possible to > build > a nice small and inexpensive oven. If one can get a true thermal gain of > 1000+, then that would theoretically mean stabilities approaching 2E-010 > over > temperature. That's 1.6E-012 per degree Celcius. > > bye, > Said > _______________________________________________ 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.