[time-nuts] Simulating Oscillator Noise: Difficulties SimulatingFlicker FM Noise

Bob Camp lists at rtty.us
Thu Apr 22 22:10:59 EDT 2010


Back in the late 70's HP was pushing their ADEV test setup to us. They hauled one in (yes indeed more than one box) for a demo. It took them most of the morning to get it in from the parking lot and set up / warmed up / running. 

They ran us through a little presentation on how ADEV has two slopes (I *wish* I'd kept a copy...). We brought out some sample oscillators, and ran them through. *Surprise* more than two slopes. I then asked them "what do the other slopes mean?". No answer .... we'll get back to you .... mumble mumble .... They never did get back to me. 

Needless to say they would have been a lot more likely to make the sale if they had one of your one page charts.


On Apr 22, 2010, at 9:55 PM, Tom Van Baak wrote:

> Hi Kyle,
> I looked into this a while ago and just ended up using the
> random clock data generators within Stable32. But if you
> end up with a code snippet for flicker noise let us know.
> You'll find a wealth of ADEV information at Bill Riley's site.
> http://www.stable32.com and http://www.wriley.com
> You may also find this one-page chart I made very interesting.
> It shows phase, frequency, and stability for all five noise types.
> <http://www.leapsecond.com/pages/allan/Exploring_Allan_Deviation.pdf>
> A total of 20 plots on a single page. It shows you every ADEV
> and MDEV shape you've ever seen.
> /tvb
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