-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Matt Ettus wrote: > 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. > > > The easiest way to check for lock is to put the following line in your > firmware: > > clocks_enable_test_clk(true,10); > > This will output a test clock on the middle 2 pins of the 4 pin > connector right near the VCXO on the motherboard. Look at one of those > 2 pins on an oscilloscope at the same time as the 10 MHz reference. You > should see the two clocks don't drift relative to each other. > > Matt > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Is the test clock supposed to be running at 5kHz? I've just tested this on one of my USRP2 - it does appear to be locked with my external clock - - i.e. the 5kHz signal on the pin doesn't drift w.r.t my 10Mhz external source. 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Cygwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJnZtMgfOzzR5bXIgRAlD2AJ4358ZGT8PbPAfp3S6F5LKBEBFG1QCeKy6+ WEBFDTXjvLgtogJazqwQWjE= =bvvj -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
