[time-nuts] FRS-C spec

John Ackermann N8UR jra at febo.com
Tue Jul 26 21:27:09 EDT 2005

chuck at frequencystandards.com wrote:
> Is anyone familiar with the Efratom model FRS-C rubidium? I am trying to
> find out if there is a published spec for jitter on it.
> If it isn't available, does anyone have one of these units and knows
> what it typically runs on theirs?
> Thanks, Chuck Norton

Hi Chuck --

I have an FRS-C and the book for it.

The short term  stability is 1x10e-10 for 1 second, 3.16x10e-11 for 10 
seconds, and 1x10e-11 for 100 seconds.  "1 day stability" is 
1x10e-10/day, and long term drift is <5x10e-11/month.  Phase noise is 
-70dBc at 1Hz, improving to -130dBc at 1kHz.

There's also an FRS-N version ("C" is communications, "N" is navigation, 
I think).  It's about half an order of magnitude better in short term 
stability, but the same in phase noise and long term drift.

Hope this helps.


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