Notes / Aug 2026
RF Hacking: The Basics
A Raspberry Pi's GPIO pin becomes a legal 434.4 MHz transmitter with rpitx. An RTL-SDR and Universal Radio Hacker close the loop on the receiving end. ASK, FSK, and PSK each get built, sent over the air, and decoded, PSK coming back bit-inverted, an ambiguity baked into BPSK itself.
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