Back in 2009, he built “El Silbo”, a ham radio transmitter powered entirely by ... it doesn’t actually transmit voice. El Silbo is a CW affair, so you should bone up on your Morse Code ...
QRP in HAM-speak technically ... for modes like CW using FM or AM modulation. [Pete]’s interest was piqued when he read about a 10 mW 10 M QRP transmitter design in a vintage Radio magazine ...
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