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/tmp/ham Episode 1: Raspberry Pi, weak signals (WSPR) and filters

There’s something very nice with Raspberry Pi (RPi) is that you can use it’s GPIO output capability and somewhat precise clock to generate radio signals, especially weak signals radio signals (WSPR). These weak signals can travel thousands of kilometers and be received by foreign stations across the ocean. (No we’re not talking about receiving these radio signals with RTL-SDR, even though it’s nice too). HAM License prerequisite… is not so

Consumer B Gone

Consumer B Gone enables you to block a shopping cart by just playing some tones out of your mobile phone speaker as a song or as a ringtone. Consumer B Gone is born from the incredible shock that the shopping cart wheel could be remotely locked if you tried to exit the supermarket parking lot. The root cause of it was an antenna (a wire in the ground at the