Re: [Discuss-gnuradio] USRP2 phase drift

[Jeffrey Lambert]

 The transmission line can act as a phase shifter depending upon how 
long it is and how the GPS signal is being split.

~Jeff

On 7/26/2010 5:54 PM, Marcus D. Leech wrote:
> 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!!).

--
~Jeffrey Lambert,  K1VZX