Also, it's not clear to me what you're actually trying to do.
I'd like to capture FM signals and perform ambiguity measurements on them.
at the moment, i am failing to capture data correctly.
If you want to plot data in real time, please use either the
usrp_fft.py or usrp_oscope.py applications. You can capture data
to disk using the usrp_rx_cfile.py example.
I suggest you start with these, then do your own experiments.
These are the files that I have been using.
usrp_rx_cfile.py to write to file and usrp_fft.py and usrp_oscope.py for realtime examination of the data and Matlab for post processing, based on the utils in gnuradio-core.
Eric