Re: [Discuss-gnuradio] Syncrinization of two USRP2s

[Juha Vierinen]

I was just recently fighting with this, and Matt told me that I have
to modify the firmware to get the USRP2 to lock (or at least this is
the easiest way to get the lock). Have you modified the firmware yet?
You need to add

clocks_mimo_config(MC_WE_LOCK_TO_SMA);

in the main() function of txrx.c and u2_init();

juha


On Thu, May 14, 2009 at 09:32, Ulrika Uppman <address@hidden> wrote:
> Hi,
>
> We've set up a test comparing a recieved white noise signal recieved by two 
> usrp2 recievers. The two receivers were clocked (1PPS and refclk) by a GPS 
> diciplined OCXO which outpus a 1PPS signal which is phase locked to the 10 
> MHz reference. The daughterboard was the RFX400 configured with a center 
> frequency of 450 MHz and a decimation factor of 4. Several cross spectrums 
> between the two received signals shows that the syncronisation is drifting by 
> +/- 1 sample. We would like the difference to not drift. Is this possible?
>
> Regards,
> //Ulrika
>
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