Hello everyone, I'm currently running into issues while trying to use the RFNoC FFT block in GNU Radio. A picture of my GNU Radio flowgraph and its QT GUI Vector Sink output are attached. The configuration of UHD / my USRP should be correct as there are no problems when I stream the RFNoC RX Radio Data to my host and calculate the FFT on the host. However, when I try calculating the FFT on the FPGA, the output seems to make no sense. I can't see a noise floor or any proper signals. There's just a randomly appearing and disappearing DC spike. Other than that, the spectrum is just a flat line (see vector_sink.png).
I think that this problem comes from some faulty configuration of the RFNoC FFT block. Unfortuantely, I haven't been able to find any helpful and up-to-date information about its usage online. I would be very glad to get some help from this mailing list. Thank you and regards Luca
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