First radio

First signals
https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.youtube.com/watch%3Fv%3DmmHa8H_Oq1M&ved=2ahUKEwiA7Y7W8t-MAxWWSkEAHePTIJAQwqsBegQIDBAE&usg=AOvVaw1ys8fJBFVAL0QXa4pPEHcy
First transceiver

First contacts

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