We posted those numbers because they are the numbers we know will work reliably. -15dBm is unlikely to work well, but you won't damage anything by trying.
Matt On Wed, Apr 23, 2014 at 3:43 PM, Antonio Petrolino <apetrol...@mbigroup.it>wrote: > Thank you Marcus, > I will wait for some answers from usrp-us...@lists.ettus.com before > proceeding. > > Best regards, > Antonio > > > > On 04/23/2014 03:31 PM, Marcus Müller wrote: > >> 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 >>> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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