Just some quick calculations in python: exact phase increment for 10 MHz:
>>> (10e6/100e6)*2**32 429496729.6 Closest phase increment: >>> np.round((10e6/100e6)*2**32) 429496730.0 Resulting frequency: >>> (np.round(10e6/100e6*2**32)/2**32)*100e6 10000000.009313226 We are out by 9.3mHz! On Tue, Jun 17, 2014 at 3:36 PM, Sylvain Munaut <246...@gmail.com> wrote: > Hi, > > > To start I want to characterize the phase noise of the device, therefore > > I send to both the RX channel and to the frequency reference input the > > same 10 MHz signal. I configured the N210 for 200 kHz sampling and a > > carrier frequency of 10 MHz. > > The LFTRX doesn't have a tuner so if you set a carrier freq of 10 MHz > the frequency shift is done by the FPGA via CORDIC and you'll have > numerical errors in there. You just can't get rid of them. > > > Cheers, > > Sylvain > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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