SDR is a really cool topic! The math behind is a bit tricky, but there are so many tools already available so users hardly get in touch with the low-level stuff. I bought a cheap USB DVB-T stick to play with it and could track nearby planes from a RaspberryPi or listen to FM radio stations.
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I let other people handle the tricky math. I prefer to think of the uses for the software.
Thanks for reading and commenting.