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Evolution of Telecommunications: A Journey Through Technology

Explore the timeline of telecommunications, from Bell's telephone patent in 1876 to Farnsworth's TV invention in 1927 and beyond. Discover the impact of telecommunication devices like radio, satellite, and telegraph, leading to modern cellular technology and television. Learn how these inventions work and their significance in communication history.

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Evolution of Telecommunications: A Journey Through Technology

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  1. Telecommunications Overview of Technology

  2. Timeline of Telecom 1876: Bell patents the telephone 1920: KDKA in Pittsburgh provides regular commercial radio broadcasts 1927: Philo Farnsworth demonstrates his invention, the television 1963: Syncom II becomes the first communication satellite to geosynchronously orbit the Earth 1973: ARPANET uses e-mail 1978: GPS begins operating

  3. Telecommunications Communication over long distances • Popular telecom devices today • Telephone • Television • Radio • Satellite • Other telecom devices in history • Smoke signals • Pony Express • Lighting signal fires on top of hills

  4. Telegraph • Sends electronic impulses over wire • Made up of • Battery • Sending device (key) • Wire • Receiver (sounder) • Morse Code

  5. Telegraph cont’d • Significant step in communicating over long distance • Led to the development of the telephone

  6. Telephone • Alexander Graham Bell is credited with the invention of the telephone, but his patent was only two hours ahead of Elisha Gray who also had developed a telephone.

  7. How does the telephone work? • Research what materials Bell used in creating his telephone. • How did he use the materials to carry sounds over long distances. • Find a picture of what his phone looked like.

  8. Cellular Technology • Use radio waves to transmit conversations • Call is transferred from one operating area to another to maintain a good signal • Operating area is called a cell ( hence “cellular”) • Your conversation is bounced around from one cell to another.

  9. Transmission Channels • Wires, cable, optical fibers, microwaves, radio waves. • Look on the Internet and find the uses in transmission for : • Copper wire • Coaxial cable • Optical fibers • Microwaves • Radio waves

  10. Cellular area

  11. Television • Electronic system of transmitting pictures and sounds over a wire or through the air.

  12. How television developed • In the 1920’s sending visual images over distances became the ambition of many inventors • Early TVs had poor picture quality • Small screen • Had to sit directly of front of set

  13. Uses of Television • Thought of only as a entertainment early • Later it became obvious that it could be used for • Education • Information distribution • In 1939, only 1 or 2 programs were aired daily • By 1946, the number of programs was growing rapidly • Now we have hundreds of options

  14. How the TV works • Camera • Transmission • Receiver

  15. The Television Camera • Camera converts images and light (video) and sounds (audio) into electrical signals that can be recorded. • The recorder puts this information onto magnetic tape, discs, or memory cards. How TV works

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