SV: [Discuss-gnuradio] Syncrinization of two USRP2s

[Ulrika Uppman]

 We do call config_mimo(MC_WE_LOCK_TO_SMA) when we set up the usrp2 (before the 
start of receiving). Is clocks_mimo_config() different from config_mimo()?

I also read about the troubles with config_mimo before revision 10471, but we 
use 10899 of the software, so that problem should be solved i guess. The 
firmware used is the built version of 10766.

/Ulrika

-----Ursprungligt meddelande-----
Från: Juha Vierinen [mailto:address@hidden 
Skickat: den 14 maj 2009 12:39
Till: Ulrika Uppman
Kopia: address@hidden
Ämne: Re: [Discuss-gnuradio] Syncrinization of two USRP2s

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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