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My first thing to attempt with my new rPi4 is kinda ambitious: SDR, or "software defined radio". I bought this cool HackRF One SDR board, in my case, with just top and bottom plastic covers (instead of a metal case) so I could see – and potentially mess around with – the circuit board. The board is already co-mounted with the rPi4 and connected to it:

I'm now in the process of learning how to use it, since it has a full suite of doc and a robust github repository, along with a forum and mailing list. Now it's just up to me to get my head in there and take a look.