History Of Amateur Radio
Description: 1831: Michael Faraday Demonstrates Induction Principle-Electricity and Magnetism Are Related. 1850: James Clerk Maxwell Advances Theory that Light is an Electromagnetic Wave. 1864: Mahlon Loomis transmits wireless telegraphy 18 miles between two mountains using kites as antennas.
1870: Loomis accomplishes successful ship to ship wireless communications over two miles on the Chesapeake Bay under U.S. Navy sponsorship. 1884: Edison Patents “The Edison Effect”, his only discovery 1 in pure science – Electrons flow from a heated filament to a cold plate through a vacuum.
Edison patented the idea but wrongly dismissed it as just a scientific curiosity with no practical use. 1886: Heinrich Hertz Proves Maxwell’s Theory Through Experimentation. 1899: Marconi sends a wireless message across the English Channel.
1901: Marconi sends a message across the Atlantic. 1900: Reginald A. Fessenden succesfully transmits voice over a distance of 1 mile.
December 24, 1906: Prof. Fessenden demonstrates audio-modulated CW, presenting the world’s first radio broadcast, including voice and music, from Brant Rock, MA. 1904: John Ambrose Fleming Introduces the “Thermionic Valve” – the first vacuum tube.
1906: Lee De Forest Introduces the Audion. 1918: Major Edwin Armstrong Discovers the Superheterodyne Principle – the basis for virtually all modern radios and televisions. 1921: Amateur Radio Station 1BCG The Radio Club of America Club Station.
“Here’s a brief tour and review of the CR-1a from Commradio. This SDR has excellent build quality and performance. The price is moderately high though. While I’d say this receiver receives signals as well as my Icom R-75,... Read more