[time-nuts] OSA 8600 Oscillators

wa1zms at att.net wa1zms at att.net
Wed Mar 15 13:42:23 EST 2006

>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" <bill at iaxs.net>
> 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
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