Modifications to original FreqShow code from Adafruit that used a Raspberry Pi & PiTFT-based RTL-USB SDR to run the frequency scanning and display tool using a Ettus Research USRP B200 mini SDR.
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Uses the USRP Python API: https://kb.ettus.com/UHD_Python_API
To run, type on the Raspberry Pi terminal:
python freqshow.py