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SDR+PI with flipper zero functionality
(lemmy.world)
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You can listen to FM radio with gqrx relatively easily, if you can navigate through hundreds of input boxes.
Anything more complicated will require some coding knowledge, unless someone already created a library for that specific thing.
There is also a ready-made package to listen to GPS signal, unfortunately it needs an external amplifier and a proper antenna, because RTL-SDR is not sensitive enough for GPS.