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https://www.eeworm.com/dl/522085.html
书籍
Radio_Frequency_Modulation_Made_Easy
By inventing the wireless transmitter or radio in 1897, the Italian physicist Tomaso
Guglielmo Marconi added a new dimension to the world of communications. This
enabled the transmission of the human voice through space without wires. For this
epoch-making invention, this illustr ...