I am trying to extend the usrp_wfm_rcv_pll.py by reading the RDS
subcarrier, however I have a problem observing the subcarrier at all. I
have connected a file_sink to the fm_demod in order to see the spectrum
in Matlab. In the spectrum I can observe the L+R, L-R and pilot tone,
but no RDS subcarrier at 57kHz.
Have anyone successfully seen this channel on broadcast FM?
Is it possible that the RDS subcarrier doesnt have enough power to be
oberved with the USRP board?