Thank you, I tried to use the NBFM transmit block. I generated a signal with a frequency of 32k. This I connected with the NBFM-Block. The quadrature Rate of this block is 320k. This output i connected with the USRP an a FFT-Plot. I expected to see a line at 320k and two lines at (320k- 32k) = 288k and (320k+32k) = 352k. But on the FFT-Plot and on the Spectrum Analzer which is connected to the USRP, I only see a line at 320k. Here the grc-file: http://old.nabble.com/file/p29150442/myFM.grc myFM.grc -- View this message in context: http://old.nabble.com/fm-modulation-tp29149390p29150442.html Sent from the GnuRadio mailing list archive at Nabble.com.
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