[time-nuts] Is there anything better than a crystal oscillator?

Ulrich Bangert df6jb at ulrich-bangert.de
Wed Apr 23 12:41:33 EDT 2008


you really do know how to start a lively discussion!!
For more on sapphire google for "whispering gallery oscillators", for
the latest in quarz development google for "bva resonators". And yes,
what you are saying is true. Most atomic standards need an xtal
oscillator as an "flywheel" to produce a low phase noise output signal @
observation times of less than a few seconds or so.

Best regards
Ulrich Bangert

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Peter Vince
> Gesendet: Mittwoch, 23. April 2008 17:41
> An: time-nuts at febo.com
> Betreff: [time-nuts] Is there anything better than a crystal 
> oscillator?
> Over the years, better and better long-term accuracy has been 
> achieved with various "atomic" references, but if I understand 
> correctly, the actual oscillating element is still a quartz crystal, 
> albeit in a tightly controlled loop.  None-the-less, from discussions 
> in this group I believe that the short-term noise and stability is 
> still mainly that of the quartz crystal, and its associated 
> electronics.  Is there anything better than quartz?  Did I hear 
> something about sapphire?
> 	Regards,
> 		Peter Vince  (London, England)
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