actually with our configuration we simply synchronize using the MIMO cable and setting one of the USRP2s to slave its clock to whatever the other one is using (I forget exactly how this is done but we do pretty much everything with GRC, so I think it's just in the source block for the USRP2 - I am not at the location with our system at the moment so I can't give you a better answer).
I'm pretty sure we are not using an external clock at all. of course our configuration is specific to our application requirements - we use the second (slave) usrp2 to read a signal which is a function of the master's receive signal and its transmit signal (I am being deliberately vague). I know that if I transmit from the master our system doesn't work (because I tried it). -Tom On Wed, Jan 27, 2010 at 9:21 AM, MarcW <mw...@ic.ac.uk> wrote: > > I would like to synchronise multiple USRP2 boards together. I know I need a > 10Mhz reference clock and a synchronous 1PPS signal but have a few questions > regarding the specifics of this, > > 1.) The USRP2 FAQ suggests to use a GPS clock but has anybody managed to > successfully use anything else such as a function generator or other common > lab equipment? > 2.) Does the reference clock need to be a sine wave or can it be square > etc...? > 3.) What function should the PPS signal be? > 4.) Do I need to modify the FPGA firmware to enable locking from the > external signal? > 4.) Is an active splitter absolutely necessary to use or can i get by with > passive? > 5.) Is there a good way to test whether I have correct synchronisation? > > Marc. > -- > View this message in context: > http://old.nabble.com/Syncronising-multiple-USRP2-boards-tp27338003p27338003.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
