[time-nuts] Fury - Rubidium - PIS

J. Forster jfor at quik.com
Wed Jul 28 03:18:28 UTC 2010


You really can't expect to be able to tweek a loop without giving it
several time constants (at least) to settle out between changes.

-John

==========


> I found that on the FRS-C and the X72 the frequency output was not at
> all linear with respect to EFC, which made things worse with large
> dacgains.  After _MANY_ hours of watching and playing with different
> settings, I came to the conclusion that you just need to be patient when
> using Fury+Rb, don't expect it to converge like an OCXO, but it will
> over a few hours and give you a good result as long as you have stable
> power and shield it from air streams.  High dacgain and efcs give you
> the false hope that it will converge fast, but as the unit settles the
> loop will fail, and it will start fighting with itself.





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