[time-nuts] Cesium Oscialltors and Low Phase Noise Frequency Standard
Enrico Rubiola
rubiola at femto-st.fr
Fri Dec 7 19:07:00 EST 2007
Martyn,
designing a Cs standard is not the job for a single man,
yet I might help you to find frustrated scientists who worked
on a Cs project (some 10 years ago I took a part in a project,
designing damn impossible precision electronics).
About the noise of your quartz oscillator, not bad.
Yet:
Oscilloquartz 8607 has -128.5 dBrad^2/Hz at 1 Hz offset, at 5 MHz,
which scales to -122.5 at 10 MHz, thus -125.5 dBc.
Off the shelf, may have some delay.
Rakon has -132 dBrad^2/Hz at 1 Hz offset, at 5 MHz,
which scales to -126 at 10 MHz, thus -129 dBc.
Small production for space, not sure you can actually
buy it.
In your oscillator, is the power dissipated by the quartz of
40 microwatts?
Can you send a spectrum?
I am getting great fun in reverse engineering the oscillator
noise. The noise I mean, not the oscillator. This takes
some 40-50 pages of my forthcoming book on
phase noise and frequency stability in oscillators.
You can't enter an order number, you must wait for
Cambridge University Press, which is a non-profit
company.
Cheers,
Enrico
On 6 Dec 2007, at 15:12 , Martyn Smith wrote:
> Hi,
>
> Is there anyone out there clever enough to design me a cesium
> frequency standard??
>
> There's only two manufacturers that I know of and there's room for
> another supplier.
>
> Also you may be interested to read we have just developed what we
> believe to be the worlds lowest close-in phase noise 10 MHz
> oscillator.
>
> It makes -121 dBc/Hz @ 1 Hz. Noise floor is only -162 dBc/Hz at
> the moment, but we are working on reducing this a further 5 to 10 dB.
>
> Enter your order number here......
>
> Best Regards
>
> Martyn
>
> This Email is from:
>
> Martyn Smith
> Precision Test Systems LTD
> Tel: +44 (0) 1245 329608
> Email: martyn at ptsyst.com
> Web: www.ptsyst.com
>
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Enrico Rubiola
professor of electronics
web: http://rubiola.org
e-mail: rubiola at femto-st.fr
FEMTO-ST Institute
32 av. de l'Observatoire
25044 Besancon, FRANCE
voice: +33(0)381.853940 (E.Rubiola)
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