RTA 210 Lecture Notes - Lecture 2: Cape Breton Island, Lee De Forest, Wireless Telegraphy
9 Sep 2018
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Document Summary
Italian guglielmo marconi is most frequently credited with the invention of wireless telegraphy in 1895, now known as radio. It was developed as a means of sending morse code without the need for landlines running from one conversant to the other. A successful transmission across the atlantic ocean was made in 1901. This method of communication, however, only became reliable in 1907. The recipient of the transmissions was cape breton island, in a station that would become known as cfcf. As mentioned, the first broadcast was made by reginald fessenden in 1906. He invented a means of broadcast called amplitude modulation (am) which mixed high frequency waves to carry the human voice. De forest was a shameless self promoter who was known to take ideas from other inventors, to the extent that he was successfully sued by fessenden in 1906. He did, however, invent something known as the audion , by augmenting a radio tube that turned ac into dc.
