Hi, looking at the N200 schematics from files.ettus.com, I'd say: stick to the 0dBm, your clock signal has to pass a transformer and some safety/matching circuitry and still ought to be more accurate than the on-board VCTCXO; the clock multiplexer (http://www.micrel.com/index.php/en/products/clock-timing/clock-data-distribution/multiplexers/article/29-sy89545l.html) datasheet says it needs at least a voltage swing of 0.1V after that. I'm not very much of a circuits person, but I think you won't deteriorate much of your clock accuracy by using a clock buffer, which are quite inexpensive (if you need but one and are not afraid to solder... TI gives away samples for free). Then again, you're trying to achieve a better clock performance than the on-board 10MHz ref clock, so I guess you shouldn't start introducing cheap hardware in the clock signal path...
Greetings, Marcus PS: maybe the usrp-us...@lists.ettus.com mailing list is better suited for this... I've added that to CC: On 04/23/2014 03:07 PM, Antonio Petrolino wrote:
Hi, I'm using a USRP N210 and I need a 10 MHz reference clock. From ettus.com I got: " Ref Clock - 10 MHz Using an external 10 MHz reference clock, a square wave will offer the best phase noise performance, but a sinusoid is acceptable. The reference clock requires the following power level: USRP2 5 to 15 dBm N2XX 0 to 15 dBm " So in my case (N210) I should have a minimum 0 dBm signal. Can someone confirm this information (N2XX 0 to 15 dBm) for N210? The bad news for me is I have a -15dBm 10 MHz available... Thank you, Antonio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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