Same procedure I outlined before. You need to feed a CW tone (via cable) directly into the USRP and spectrum analyzer, compare spectrum amplitudes, and multiply the USRP samples by 10**(offset_dB/20.0). Noise or a modulated signal makes things more difficult since spectrum analyzer must be put in noise marker mode. Just use a CW tone. Lou
Jan wrote > Actually, you were right at first madengr. My transmitter is USRP1 with > WBX > 50-2200 while my receiver is USRP N200 with TVRX2 and spectrum analyzer. > Can you give me suggestions on how I can match the amplitude on both the > spectrum analyzer and the USRP's? Attached is a screenshot of my > experiment > on our lab. > > Using just the GRC Signal Source and Noise Source, I was able to display > the desired power amplitude in dBW with less than 10 dB loss by varying > the > amplitude of each block. For the Signal Source block, the amplitude was > 6.31 exp -8 (-144 dBW). For the Noise Source block, the amplitude was 2 > exp > -8 (-154 dBW). GRC FFT produces -137 dB and -159 dB respectively. > Therefore > I can say that these dB values in the FFT plot are in dBW. > > Best, > > *Gerome Jan M. Llames * -- View this message in context: http://gnuradio.4.n7.nabble.com/GRC-FFT-Plot-tp55210p55258.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
