Well, we're just that good, I guess. The optional GPSDO used in the N210 has an extremely accurate oven-controlled crystal oscillator inside to provide a frequency reference with excellent holdover characteristics. The GPSDO drifts very little and the N210s frequency will remain accurate for some time after GPS signal loss.
--n On Thu, Sep 27, 2012 at 1:45 AM, Ting Wu < wu.t...@comf5.comm.eng.osaka-u.ac.jp> wrote: > Dear all,**** > > ** ** > > I find the sampling rate of USRP is surprisingly accurate.**** > > Now I set the sampling rate as 4 MHz, and there are always exactly 4M > points between two pps signals.**** > > Even if I take off the GPS antenna, the sampling rate is still very > accurate.**** > > This means I only need the GPS antenna at the beginning to get an accurate > time stamp.**** > > Later I can take off the antenna and still can get accurate time from > sampling rate.**** > > ** ** > > My colleagues and I do not understand how does USRP make the sampling rate > so accurate.**** > > We had used other types of A/D converters before.**** > > They usually do not have such accurate sampling rate.**** > > Sometimes they have around 4M plus and minus 100 points in one second > under 4M sampling rate.**** > > ** ** > > Thanks for your attention.**** > > ** ** > > Wu**** > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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