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Essay

Communication Systems

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Issue:

Technology

 

Written by:

Elisa B

 

Date added:

October 3, 2011

 

Level:

University

 

Grade:

A

 

No of pages / words:

8 / 2227

 

Was viewed:

8825 times

 

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Essay content:

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...
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The international unit of measurement of frequency is hertz, abbreviated Hz. The English unit is cycles per second, abbreviated cps (1 Hz = 1 cps). It is rarely used. To simplify terminology, 1000 Hz is called kilohertz, abbreviated kHz, and 1000000 Hz is called a megahertz, abbreviated MHz. The vibration rate of sound waves in air may also use the term frequency...
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