Couldn't you just tell the USRP's to start at a specific time to get them to start in sync? Rather than in real-time telling them to start immediately and having that lag.
Tim ------------------------------------------- Timothy R. Newman, Ph.D. Wireless @ Virginia Tech 447 Durham Hall Blacksburg, VA 24061 Phone: 540-231-2041 > -----Original Message----- > From: discuss-gnuradio-bounces+trnewman=vt....@gnu.org [mailto:discuss-gnuradio- > bounces+trnewman=vt....@gnu.org] On Behalf Of Douglas Geiger > Sent: Friday, February 13, 2009 2:02 PM > To: discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] USRP2 PPS and REF > > > Ok - so I have packets coming in from both USRP2's now, getting dumped > to their separate files. > My app prints out the timestamp of each frame that gets sent to the > copy handler: if my 1PPS source is working properly, should the > timestamps coming out of the two USRP2's be identical? > Another question: no matter what, there is going to be some time delay > between when I tell one USRP2 to start, and when I tell the other one to > start: with the timestamps I could do something like > align_on_samplenumbers (but with the timestamps - at least I could do > this in the copy handler where I have access to this information). Of > course this requires that the timestamps do end up being based on the > 1PPS. Should I take that as a sign my USRP2's are not currently getting > sync'd to the 1PPS? > Thanks, > Doug > > -- > Doug Geiger > Research Assistant > Communications and Signal Processing Lab > Oklahoma State University > http://cspl.okstate.edu > douglas.gei...@okstate.edu > doug.gei...@ieee.org > > > _______________________________________________ > 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