I created a flowgraph based upon the usrp_nbfm_ptt.py example. I am
witnessing some weird, asymmetric behavior when running the graph. The
generates a tone from the user specified daughterboard and then plots
spectrum via an fft from another user specified daughterboard. I am
RFX-1800 daughterboards with a single USRP to run the graph, however I
imagine it should work the same for any RFX board. Here is the main
Everything works fine when using Side B as the transmitter and Side A as
Receiver. When running with Side A as the transmitter and Side B as the
receiver, however, the fft display is really just noise (once in a while
there exist some spectral lines at odd frequencies). As a note, I am
certain that the mux’s are being set correctly and that the boards are
tuning correctly. To verify that the issue is not the hardware, I am
capable of running usrp_siggen.py and usrp_fft.py in both configurations
successfully. (TXR A --> RXR B, TXR B --> RXR A). Also, I have done
tests in completely wired (with 60 dB of attenuation) and unwired
environments, with both yielding the same results. Attached is the code
that I am running, can anyone point out something silly that I am doing
is causing this problem?
As an added note, I am getting a segmentation fault when I close the
by any means other than from the command line. I don’t think
is related to the above issue, and I don’t get the seg fault when
the original usrp_nbfm_ptt.py code.
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