[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

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