/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 bad You need to have a HAM (Radio Amateur) license to transmit (yes, even a few milli-Watts (mW) or radiated power), but good news is that it’s the best time right now to pass your HAM license: France has just changed its license test method so that bad answer don’t cost you points, and you can repeat (cram) exams so it’s not that difficult. US has a much better and more progressive license scheme (Technician -> General -> Amateur Extra) and excellent teaching resources that makes it so much easier to get started. … and you’ve got plenty of time to prepare for exams since you can’t get out due to this covid-19 lockdown Now if y