Hi Przemek, the USRPs are all up/downconverting transmitters/receivers: You digitally provide them with a complex baseband signal, which they convert to an analog I / Q signal, and use quadrature mixing with a synthesized LO to shift the signal in frequency domain to that LO's frequency (TX). In RX direction, they take the RF bandpass signal, mix it with a synthesized LO to baseband and simultaneously sample the I and Q channels so that you get a digital complex baseband signal.
Hence, to generate a 6GHz sine, you'd just generate a constant value as complex baseband signal (sampling rate doesn't matter for constants!) and let the USRP mix it up to 6GHz. Generally, the USRPs are direct-conversion transceivers as described, but can also physically be used as low-IF transceivers thanks to the DSP frequency shifting. Best regards, Marcus On 14.09.2015 22:36, Przemek Lewandowski wrote: > Hello everyone > > I didnt try it yet, but as I see Ettus B210 has got 61 MS/sec and 6 > GHz upper frequency limit. > > If I want to generate Sinusoid for 6 GHz, I need a 12Giga Sample Rate > (Nyquist theorem) ?! Propably not, as I think. > > > Thank You > Przemek Lewandowski > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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