Greetings, I was wondering if anyone is familiar with utilizing the FFT block from the Ettus code library. I am using the default binary that is complied following the instructions in [1]. I have a working environment and have successfully used the foshpor window in the end example of that install to look at the spectrum around my area, which was really cool. I had some old hackRF examples I had made when I went through that course and was trying to convert them over to run on the E312, which some changes. I started with building a radio using the UHD software components but found out real quick that A9 can not sample fast enough, so switch to slowly using the RFNoC blocks, like Radio, FIFO, FFT, to do the heavy lifting, with a ZMQ Push to my host where it does software processing on it. Right now its just meant to be an FM radio, like in your car, and I have copied many of the modules over from the fosphor example in the gr-ettus install examples folder.
With that bg, I get an interesting result. With the components of Window and FFT disabled I get an audio output. When I don't the host shows on the QT GUI a sync at my centering frequency. I assumed it was b/c the RFNoC blocks were operating with a 512 vector size and GNU Radio software blocks prefer a vector size of 1 (for some of them like QT GUI). I also thought it was b/c the QT block also has an FFT, so I placed an inverse FFT inline, which had no effect. With all this said, I know there needs to be an FFT to process an analog signal, that is how a DFT is handled with logic or computers. I would like to do the heavy lifting on the FPGA with its FFT, rather than relying on the FFT in the gui, and also still get audio out. Does anyone have an suggestions, and are there any reference materials that could be recommended? I have mostly been using Google and examples I can find on the Ettus KB, plus the gr-ettus installed examples as references. I have attached my .grc files for reference. Regards, Jon Lockhart [1] https://kb.ettus.com/Software_Development_on_the_E3xx_USRP_-_Building_RFNoC_UHD_/_GNU_Radio_/_gr-ettus_from_Source
fm_example_host.grc
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fm_example_usrp.grc
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