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External Clock with USRP2

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	External Clock with USRP2 by Kelley, Clifford W :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message We've been testing the clock of our USRP2 and find that it stabilizes at about 8 parts per million low in frequency. Using a precise 10 MHz external clock does not seem to have any effect. Any ideas on how we can bring it in a bit closer? Thanks, Cliff _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
	Re: External Clock with USRP2 by Tom Rondeau :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Kelley, Clifford W wrote: > We've been testing the clock of our USRP2 and find that it stabilizes at about 8 parts per million low in frequency. Using a precise 10 MHz external clock does not seem to have any effect. Any ideas on how we can bring it in a bit closer? > > Thanks, > > Cliff Did you call "config_mimo(usrp2.MC_WE_LOCK_TO_SMA)" on the usrp2 object you created? That tells the board to get its clock from the external SMA connector. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
	RE: External Clock with USRP2 by Kelley, Clifford W :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Tom, Thanks very much. That worked. Somehow we missed that in our searches. Cliff -----Original Message----- From: Tom Rondeau [mailto:trondeau1122@...] Sent: Tuesday, November 03, 2009 6:58 PM To: Kelley, Clifford W Cc: discuss-gnuradio@... Subject: Re: [Discuss-gnuradio] External Clock with USRP2 Kelley, Clifford W wrote: > We've been testing the clock of our USRP2 and find that it stabilizes at about 8 parts per million low in frequency. Using a precise 10 MHz external clock does not seem to have any effect. Any ideas on how we can bring it in a bit closer? > > Thanks, > > Cliff Did you call "config_mimo(usrp2.MC_WE_LOCK_TO_SMA)" on the usrp2 object you created? That tells the board to get its clock from the external SMA connector. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio