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I'd like to use the Pi to make an FM radio but I also want to be able to read multiple frequencies with the Pi at the same time. Is this possible through using SDR and antenna and software? Or should I look into some sort of physical multiplexor that is compatible with the Pi?

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  • The SDR reads the whole spectrum (in the range it can cover), but if you can usefully process multiple broadcasts at the same time on the Rpi, I do not know. With just audio it might be possible.
    – Tomas By
    Oct 23, 2018 at 23:51

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Devices decoding several transmissions at once are called "skimmers". There are readily available SDR skimmers for continuous wave signals, like telegraphy or Morse code.

Multi-channel FM reception is significantly more complex because of non-trivial modulation. You may take a look at MultiFM project and see if you can get it working on an RPi.

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