Electronic Communications Engineering PDF

Introduction Electronic Communications Engineering # DEFINITIONS OF TERMS 1) Its fundamental purpose is to transfer information from one place to another. Electronic Communication System 2) The transmission, reception, and processing of information between two or more locations using electronic c...

Introduction Electronic Communications Engineering # DEFINITIONS OF TERMS 1) Its fundamental purpose is to transfer information from one place to another. Electronic Communication System 2) The transmission, reception, and processing of information between two or more locations using electronic circuits. Electronic Communication 3) Electronic Communications Time Line 1830: American Scientist and professor Joseph Henry transmitted the first practical electrical signal. 1837: Samuel Finley Breese Morse invented the telegraph. 1843: Alexander Bain invented the facsimile. 1861: Johann Phillip Reis completed the first nonworking telephone. 1864: James Clerk Maxwell released his paper “Dynamic Theory of the Electromagnetic Field”, which concluded that light electricity, and magnetism were related. 1865: Dr. Mahlon Loomis became the first person to communicate wireless through the Earth’s atmosphere. 1866: First transatlantic telegraph cable was installed. 1876: Alexander Graham Bell and Thomas Watson Invented the telephone. 1877: Thomas Alva Edison invents the phonograph. 1880: Heinrich Hertz discovers electromagnetic waves. 1887: Heinrich Hertz discovers radio waves. Marchese Guglielmo Marconi demonstrates wireless radio wave propagation. 1888: Heinrich Hertz detects and produces radio waves. Heinrich Hertz conclusively proved Maxwell’s prediction that electricity can travel in waves through the Earth’s atmosphere. 1894: Marchese Guglielmo Marconi builds his first radio equipment, a device that rings a bell from 30 ft. away. 1895: Marchese Guglielmo Marconi discovered ground wave propagation. 1898: Marchese Guglielmo Marconi established the first radio link between England and France. 1900: American Scientist Reginald A. Fessenden the world’s first radio broadcast using continous waves. 1901: Marchese Guglielmo Marconi transmits telegraphic radio messages from Cornwall, to Newfoundland. Reginald A. Fessenden transmits the World’s first radio broadcast using continuous waves. First successful transatlantic transmission of radio signal. 1903: Valdemar Poulsen patents an arc transmission that generates continuous wave transmission 100-kHz signal that is receivable 150 miles away. 1904: First radio transmission of music at Graz, Austria. 1905: Marchese Guglielmo Marconi invents the directional radio antenna. 1906: Reginald A. Fessenden invents amplitude modulation (AM). First radio program of voice and music broadcasted in the United States by Reginald Fessenden. Lee DeFrorest invents triode (three-electrode) vacuum tube. 1907: Reginald Fessenden invents a high- frequency Electric generator that produces radio waves with a frequency of 100 kHz. 1908: General Electric develops a 100-kHz, 2-kW alternator for radio communications. 1910: The Radio Act of 1910 is the first concurrence of government regulation of radio technology and services. 1912: The Radio Act of 1912 in the United States brought order to the radio bands by requiring station and operators licenses and assigning blocks of the frequency spectrum to the existing users. 1913: The cascade-tuning radio receiver and the heterodyne receiver are introduced. 1914: Major Edwin Armstrong develops the superheterodyne radio receiver. 1915: Vacuum-tube radio transmitters introduced. 1919: Shortwave radio is developed. 1920: Radio Station KDKA broadcasts the first regular licensed radio transmission out of Pittsburgh, Pennsylvania. 1921: Radio Corporation of America (RCA) begins operating Radio Central on Long Island. The American Radio League establishes contact via shortwave radio with Paul Godley in Scotland, proving that shortwave radio can be used for long distance communications. 1923: Vladimir Zworykin invents and demonstrates television. 1927: A temporary five- member Federal Radio Commission agency was created in the United States. 1928: Radio station WRNY in New York City begins broadcasting television shows. 1931: Major Edwin Armstrong patents wide- band frequency modulation (FM). 1934: Federal Communications Commission (FCC) created to regulate telephone, radio, and television broadcasting. 1935: Commercial FM radio broadcasting begins with monophonic transmission. 1937: Alec H. Reeves invents binary coded pulse-code modulation. (PCM) 1939: National Broadcasting Company (NBC) demonstrates television broadcasting. First use of two-way radio communications using walkie-talkies. 1941: Columbia University Radio Club opens the first regularly scheduled FM radio station. 1945: Television is born. FM moved from its original home of 42 MHz to 50 MHz to 88 MHz to 108 MHz to make room. 1946: The American Telephone and Telegraph Company (AT&T) inaugurated the first mobile telephone system for the public called MTS (Mobile Telephone System). 1948: John Von Neumann created the first store program electronic digital computer. Bell Telephone Laboratories unveiled the transistor, a joint venture of scientist William Shockley, John Bardeen and Walter Brattain. 1951: First transcontinental microwave system began operation. 1952: Sony Corporation offers a miniature transistor radio, one of the first mass produced consumer AM/FM radios. 1953: RCA and MBC broadcast first color television transmission. 1954: The number of radio stations in the world exceeds the number of newspapers printed daily. 1954: Texas Instruments becomes the first company to commercially produce silicon transistors. 1956: First transatlantic telephone cable systems began carrying calls. 1957: Russia launches the world’s first satellite. (Sputnik) 1958: Kilby and Noyce develop first integrated circuits. NASA launched the United States first satellite. 1961: FCC approves FM stereo broadcasting, which spurs the development of FM. Citizens band (CB) radio first used. 1962: U.S. radio stations begin broadcasting stereophonic sound. 1963: T1 (transmission 1) digital carrier systems introduced. 1965: First commercial communications satellite launched. 1970: High-definition television (HDTV) introduced in Japan. 1977: First commercial use of optical fiber cables. 1983: Cellular telephone networks introduced in the United States. 1999: HDTV standards implemented in the United States. 1999: Digital Television (DTV) transmission began in the United States.