[time-nuts] OSA 8600 Oscillators
time.bandit at btinternet.com
Wed Mar 15 13:55:08 EST 2006
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.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of wa1zms at att.net
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
Maybe someone here on this list with more first hand experience can give us
more details about the subject.
-------------- 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?
> Bill Hawkins
> time-nuts mailing list
> time-nuts at febo.com
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