Communication Systems

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Title: Communication Systems

Essay Details:

Subject: Technology

Author: Carol W

Date: January 6, 2015

Level: University

Grade: B

Length: 8 / 2227

Essay text:

Watson transmitted human conversation over a functional telephone system. 1888 ?V Heinrich Hertz radiated electromagnetic energy from a machine he called oscillator. 1894 ?V Guglielmo Marconi was the first to accomplish wireless transmission. 1908 ?V Lee DeForest invented the triode vacuum tube. 1933 ?V Major Howard Armstrong invented frequency modulation. 1948 ?V William Shockley, Walter Brattain and John Bardeen invented the transistor. Electromagnetic Spectrum Electromagnetic Spectrum The entire range of frequency. Frequency The number of times an alternating current goes through its complete cycle per second is known as its frequency...

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