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Invented by Nikola Tesla. Started with the discovery of "radio waves." Radio waves are electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication.
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First radio created with an FM radio, invented by Edward Armstrong.Used to change to AM to FM quickly. FM usually play music, while AM played shows, plays, ect..
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This next radio was very similar to the one before, except it was smaller which made it possible to travel around with, unlike the first one which was too huge.
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Unlike the radios before which was used mainly of the purpose of listening to favorite shows, plays ect.. This radio was made for the 70's rock & roll. Also, it was more portable than previous ones.
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Created and designed to play loud music. People often carried these around with them on the streets, parks, cookouts, ect..
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Now, satellite radio is most used. In the 2000s the XM Radio and Sirius Satellite Radio began. Over varies amounts of channels covering wide amounts of space from sports to music.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.