BVAs certainly are the crème de la crème of OCXOs. I have seen examples that have been running for several years that exhibit aging down to a few parts in E-12 per day!!
The "Father" of the BVA was Raymond Besson, who now works for Laboratoire de Chronométrie Electronique Piézoélectricité, France. Rob K -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: 15 March 2006 18:42 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OSA 8600 Oscillators >From what I have read, BVA technology is about as good as it gets for the best close-in phase noise in a quartz crystal. It was once desribed to me as having the lowest "quartz-to-crud-ratio" since the elctrodes are not plated on to the quartz. A limiting factor can be that less RF power can be coupled through the crystal due to the series capacitance effect of the spaced elctordes. Close-in noise is great but far-out noise could be poorer than typical SC-cut plated xtal due to S/N effects with a lower xtal drive power. Maybe someone here on this list with more first hand experience can give us more details about the subject. -Brian, WA1ZMS -------------- Original message ---------------------- From: "Bill Hawkins" <[EMAIL PROTECTED]> > The PDF says that nothing contacts the crystal, which implies > capacitive coupling. Interesting. > > Oscilloquartz is part of the Swatch group. It has been in the business > of time synchronization for more than 20 years. All that I could learn > from their web site is that they are proud of their BVA crystal > technology, which was announced in 1982. > > Does anyone know anything about the technology? > > Hans, is it possible that you are associated with Oscilloquartz? > > Regards, > > Bill Hawkins > > > > _______________________________________________ > 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
