Could be intermodulation due to driving the RX amplifier into nonlinearity; Luca, what gain are you using? Can you further reduce it? Can you reduce the amplitude of your test signal?
Best regards, Marcus On 10.08.2015 18:31, Martin Braun wrote: > My first thought was "IQ imbalance", but it's pretty strong. Which USRP > and daughterboard do you have? > > M > > > On 10.08.2015 09:24, Luca Pascale wrote: >> Hi all, >> >> why when I use: >> uhd::tune_request_t tr(tuningFreq); >> USRP_DEVICE->set_rx_freq(tr); >> >> I get a spectrum that is "mirrored" around the tuninFreq ? >> See: http://picpaste.com/sp-zJquS0qK.png >> with tuningFreq = 149.8 MHz, input signal at F = 150 MHz (from signal >> generator) >> >> If I use a LO offset different from zero the mirror effect disappear. >> >> Why ? >> >> Thanks, >> Luca >> >> >> >> _______________________________________________ >> 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
