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waterfalldisplay
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Heatwave is a real-time RF spectrum analyzer that creates a waterfall display using RTL-SDR and other SoapySDR-compatible devices. It provides a visual representation of RF activity across frequency ranges with various analysis tools and features.
It uses the Linux framebuffer for graphics drawing!
A wiki page that documents explanations for and origins of various types of radio broadcasts people picked up with software defined radios and analyzed with software like GQRX.