On Wed, Feb 18, 2009 at 02:20:38AM +0100, Changkyu Seol wrote: > Hi! > > I am planning to implement multiple synchronized transmitters using > USRP2 and GPS receiver. Before that I checked whether the USRP2 is > locked to external clock through following experiment. > > 1) Connect the 10MHz and 1PPS from GPS receiver (EP1S, Spectracom) to > USRP2's REF and PPS in port, respectively. (I definitely checked the > electrical specifications...) > > 2) Generate 10MHz tone from the USRP2 using usrp2_siggen.py. I have > included following lines in python code. > > self._u.config_mimo((0x0001 | 0)) <--- I added this method in usrp2.i, > etc... > self._u.sync_to_pps() > > 3) Compare the 10MHz tones coming from GPS and the USRP2 through > oscilloscope (triggered to 10MHz sine wave from GPS). > > I expect that timing drift of the 10 MHz sine wave from USRP2 will be > nearly 0 or at least very slow, but it is still very fast. It seems that > including "self._u.config_mimo((0x0001 | 0))" doesn't change anything. > (I did update the fpga programming file and the firmware in SDcard.) > Am I missing something? Any comments will be appreciated. > > Changkyu Seol
That should be sufficient. Are you sure that the config_mimo command is getting sent? It's easy to check using wireshark. Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
