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Contents:
2.13.61,
2.PAK,
2 1 Game Forcing,
index,
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Did you know?
NBC set up the first permanent coast-to-coast radio network in the United States
by 1928, using dedicated telephone line technology. But the signal from an
electronic television system, containing much more information than a radio
signal, required a broadband transmission medium. Transmission by a nationwide
series of radio relay towers would be possible but extremely expensive.
Researchers at the AT&T subsidiary Bell Telephone Laboratories patented coaxial
cable in 1929, primarily as a telephone improvement device. Its high capacity
(transmitting 240 telephone calls simultaneously) also made it ideal for
long-distance television transmission, where it could handle a frequency band of
1 megahertz.
German television first demonstrated such an application in 1936 by relaying
televised telephone calls from Berlin to Leipzig, 180 km (112 miles) away, by
cable.
The network was later extended to television viewing offices in Nuremberg and
Munich.
AT&T laid the first L-carrier coaxial cable between New York and Philadelphia,
with automatic signal booster stations every 10 miles (16 km), and in 1937 they
experimented with transmitting televised motion pictures over the line. Bell
Labs gave demonstrations of the New York-Philadelphia television link in
1940–1941. AT&T used the coaxial link to transmit the Republican national
convention in June 1940 from Philadelphia to New York City, where it was
televised to a few hundred receivers over the NBC station.
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