On 07/26/2010 04:00 PM, Matt Ettus wrote:
>
> Even if you lock the USRP2 to an external reference, there will still
> be drift relative to other things not connected to the same
> reference.  The function generator has its own clock, as does GPS.
>
> Matt
>
>
Somewhat disturbingly, I've also observed in the lab phase-hits between
two GPS receivers, being fed from
  the same antenna!  I suspect differences in the phase locking
algorithms or something.  But you can't
  even rely on GPS to be consistent with itself (at least viewed by two
different GPS receivers!!).


-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org



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