L07_analog_radio

L07_analog_radio - Analog Radio Early Beginnings and...

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1 6.02 Spring 2008 Lecture 7 Analog Radio, Slide 1 Analog Radio Early Beginnings and Historical Developments Basic principles (Impulse radio, AM/FM) 6.02 Spring 2008 Lecture 7 Analog Radio, Slide 2 Wireless pre-history Key discoveries – Electromagnetic Induction and Electromagnetic Wave propagation Many people involved – XIX century Faraday discovers Electromagnetic Induction Maxwell experiments with waves and propagation, forms theory Hertz, Loomis, Edison, Hughes, Calzecchi-Onesti, Branly, de Moura, Stubblefield James Clerk Maxwell Michael Faraday Heinrich Rudolf Hertz
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2 6.02 Spring 2008 Lecture 7 Analog Radio, Slide 3 Beginings of radio (circa 1895) Surprisingly, first radios did not look like these we teach in 6.02 First used for “wireless telegraphy”, not voice Used entire frequency spectrum !!! “Spark-gap transmitter” and “coherer-based receiver” Attributed to many people Marconi – first transatlantic radio service (used coherers)
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This note was uploaded on 08/23/2009 for the course EECS 6.02 taught by Professor Terman during the Spring '08 term at MIT.

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L07_analog_radio - Analog Radio Early Beginnings and...

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