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A History of Radio Technology

A History of Radio Technology. Demystifying Telecommunications By: Al Klase. What do these Have in Common?. Information-Age Timeline. A Favorite Quote. “Any sufficiently advanced technology is indistinguishable from magic.”

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A History of Radio Technology

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  1. A History of Radio Technology Demystifying Telecommunications By: Al Klase

  2. What do these Have in Common?

  3. Information-Age Timeline

  4. A Favorite Quote “Any sufficiently advanced technology is indistinguishable from magic.” Arthur C. Clark, "Profiles of The Future", 1961 (Clarke's third law)English physicist & science fiction author (1917 – 2008) Inventor of the communications-satellite concept.

  5. A Mysterious Force • Start at the beginning • In the Stone Age • Sticks • Stones • Animal Parts

  6. Amber • Naturally polymerized tree resin • Greeks called it elektron

  7. Electrostatic Experiments

  8. Electric Field Johann Carl Friederich Gauss 1777-1855

  9. The Condenser or Capacitor Stores Energy as electrostatic charge. C = Q / V Q = charge in Coulombs (6.241506×1018 electrons/C ) V = EMF in Volts

  10. Luigi Galvani (1737-1798)

  11. Alessandro Volta (1745-1827) Ca. 1774

  12. Circuits and Schematics

  13. Yet Another Mysterious Force • Heavy black rock • Lodestone • Proved to be iron ore • Greeks found theirs in Magnesia

  14. The Compass

  15. Magnetic Field due to Electrical Current 1820 - Hans Christian Ørsted André-Marie Ampère (1775-1836)

  16. Joseph Henry 1797 - 1878 Electro Magnet and Inductor Stores energy as a magnetic field. Taught and did research at Princeton. Ca. 1824

  17. Samuel Morse’sTelegraph1838(Binary Serial Communications!) Speedwell Morristown.

  18. Maxwell Treatise on Electricity and Magnetism (1873) James Clerk Maxwell 1831 - 1879

  19. More Maxwell

  20. i

  21. Alternating Current

  22. Oscillation and Resonance

  23. High-frequency AC Oscillator

  24. Eureka!

  25. Hertz Ca. 1888 Heinrich Hertz 1857 - 1894

  26. The First Radio Receiver

  27. A Hertzian Experiment From Invention & Innovation in the Radio Industry, W. Rupert MacLaurin, 1949

  28. PHz = petahertz Ehz = exahertz

  29. Short-Wave Broadcast + WiFi, Bluetooth + Satellite TV Cellphones + GPS + + Satellite TV

  30. Propagation ModesDirect-Wave All Frequencies

  31. Propagation ModesGround-Wave ELF-VLF-LF-MF Below 30 HZ – 3 MHz

  32. Propagation ModesSky-Wave MF-HF (VHF) - 300 KHz – 30+ MHz • Can allow global point-to-point communications and broadcasting • Varies with: • Frequency • Time of day • Season • Solar activity (11-year Cycle)

  33. PART2

  34. Guglielmo Marconi • Born 1874 • Wealthy Italian father • Wealthy Irish mother (Jamison) • Tech. Institute at Leghorn included telegraphy • Inspired by Hertz’s Obituary in 1894

  35. Marconiat Villa Grifone Photos and drawings from Early Radio by Peter R. Jensen

  36. Marconi Developments • 1896 Moves to Great Britain • Sept. 1896, 2.8Km, Salisbury Plain • Mar. ‘97, 14Km, Bristol Channel • Late 1898, 29Km, Isle of Wright

  37. Marconi 1896

  38. Patent 7777Application filed 12 April 1900 From The Wonders of Wireless Telegraphy J. A. Fleming, London, 1913

  39. Passive Receivers

  40. The Fleming Valve John Ambrose Fleming3(1849 - 1945)

  41. We need areliable Amplifier!

  42. From The Wonders of Wireless Telegraphy J. A. Fleming, London, 1913

  43. The Audion Lee Deforest 1906

  44. An Audion Radio Receiver

  45. Armstrong Edwin Howard Armstrong

  46. The Regenerative Circuit “Great amplification obtained at once!”

  47. Regen Prototype Demonstrated to Sarnoff at the Marconi station at Belmar

  48. Radiotelephone

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