[DSP-10] Frequency Aging curves - What software

Sat, 09 Mar 2002 11:47:10 -0600

Hi Lee,

I am in the process of finishing my dsp10 kit and I too have been thinking
about stability of oscillators and trying to understand these specifications
from a technician point of view... ( I just took a look at Brook's website
and I will have to spend some time there.)

I was pondering the specification of PPM (parts per millions) and tried
to calculate it on my calculator when I purchased a OCXO which was
spec'ed in PPB units (parts per billion!)  I stumbled across this website
that has this all worked out for a 10 Mhz oscillator:

http://modcoinc.com/charts/chart11.htm

The chart indicates that 1 PPB for a 10 Mhz oscillator is 0.01 Hz, wow.
I think I am going to build Brooks oscillator discipliner because it's able
to chart out the fluctuations easily.  I had already taken the OCXO to
work and placed it on our Stanford SR620 counter and I can measure
down to 0.01 Hz but it brings up a host of other questions.  I have since
found a couple of weblinks that are interesting:

http://metrologyforum.tm.agilent.com/xtals.shtml
http://www.wj.com/pdf/technotes/LO_phase_noise.pdf
http://www.corningfrequency.com/piezo/papers/saav.html

Thanks for the link Lee.

dave garnier - wb9own

Lee Scott wrote:

> Stan,
>
> If you go to Brooks website http://www.rt66.com/~shera/index_fs.htm and
> look for gpslog.zip or gpslog3.zip depending on which version of his PIC
> code you have, you will find just what you are looking for.
>
> Lee - AA1YN
>
> At 10:32 AM 3/8/2002 -0600, you wrote:
>
> >Has anyone ran aging curves on their Shera or other frequency standard ?
> >If so what software did you use ?  Anything available free here on the web ?
> >
> >Thanks, Stan ak0b
> >
> >
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