Thomas, For this to work, one of the devices should provide its sync to the other device.
Unfortunately, this does NOT happen automatically. You need to configure one to drive its (reference) clock over the cable and the other to use the signal provided by the cable. This is pretty easy to do (but, I can only tell you how to do it in C++)... set_clock_config() in UHD -or- config_mimo() in Raw Enet/GnuRadio I'm sure there's some sort of equivalent in GRC, I just can't tell you what it is because I'm not familiar with that. Hope this helps, --Bob >-----Original Message----- >From: hobi...@nict.go.jp [mailto:hobi...@nict.go.jp] >Sent: Sunday, November 28, 2010 11:40 PM >To: j...@joshknows.com >Cc: discuss-gnuradio@gnu.org >Subject: Re: [Discuss-gnuradio] GRC with two URSP2+DBSRX and UHD > >Hi Josh, > >Thanks for the reply. I am using a MIMO cable between both URSP2s, so I >thought that they sync automatically. >I am not feeding a PPS to both devices, as I only need to run both >synchronously, but I don't need to sync them to outside references. > >Thomas > > >----- Original Message ----- >> From what I can tell, the times are not locked, samples cannot be >> aligned, so there can be no output. Did you >> http://www.ettus.com/uhd_docs/manual/html/usrp_nxxx.html#pps-pulse-per >-second >> >> > Warning: >> > Detected time deviation between board 1 and board 0. >> > Board 0 time is 490.997360 seconds. >> > Board 1 time is 318.628842 seconds. >> > >> > OOUHD source block got error code 0x1 >> > gr_block_executor: source <gr_block uhd multi_usrp source (1)> >produced >> > no output. We're marking it DONE.| >> > >> > >> >> _______________________________________________ >> 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 > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
