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Antennae

First Transpacific Reception of a Television (TV) Signal via Satellite
Society: IEEEMain Category: ElectricEra: 1960-1969DateCreated: 1963Ibaraki Satellite Communication CenterTakahagiZip: 318-0022Country: JapanWebsite: http://www.ieeeghn.org/wiki/index.php/Milestones:First_Transpacific_Reception_of_a_Television_%28TV%29_Signal_via_Satellite,_1963

On 23 November 1963, this site received the first transpacific transmission of a TV signal from Mojave earth station in California, U.S.A., via the Relay 1 communications satellite. The Ibaraki earth station used a 20m Cassegrain antenna, the first use of this type of antenna for commercial telecommunications. This event demonstrated the capability and impact of satellite communications and helped open a new era of intercontinental live TV programming relayed via satellite.

YearAdded:
2009
Image Caption: Artist's vision of NASA Relay 1 satelliteEra_date_from: 1963
Society: IEEEMain Category: ElectricEra: 1920-1929DateCreated: 1924Tohoku University Sendai-shiCountry: JapanWebsite: http://www.ieeeghn.org/wiki/index.php/Milestones:Directive_Short_Wave_Antenna,_1924Creator: Hidetsugu Yagi, Uda, Shintaro
Beginning in 1924, Professor Hidetsugu Yagi and his assistant, Shintaro Uda, designed and constructed a sensitive and highly-directional antenna using closely-coupled parasitic elements. The antenna, which is effective in the higher-frequency ranges, has been important for radar, television, and amateur radio. The antenna system, using a driven element with closely coupled parasitics (usually a reflector and one or more directors) for short-wave work, was first described by S. Uda, a professor at Tohuku University in Japan, in 1926, in the IEEJ (Japan). A colleague, Professor H.
YearAdded:
1995
Image Credit: Courtesy IEEEImage Caption: The Yagi-Uda directive short wave antennaEra_date_from: 1924
Society: IEEEMain Category: ElectricEra: 1930-1939DateCreated: 1930-1945Tokyo Institute of TechnologyNikahoCountry: JapanWebsite: http://www.ieeeghn.org/wiki/index.php/Milestones:Development_of_Ferrite_Materials_and_Their_Applications,_1930-1945Creator: Takei, Takeshi
Dr. Takeshi Takei, the professor at the Tokyo Institute of Technology, discovered that composite oxides containing zinc and iron have distinguished magnetic properties. In 1930, Prof. Takei submitted a paper on his work to Japanese Electro-chemical Society and also presented a paper at 57th General Meeting of American Electrochemical Society in St. Louis. That same year, Prof. Takei applied a patent for his discovery, which was granted in 1932(Japan PAT-98844). Tokyo Denki Kagaku Kogyo (now TDK Corporation) was founded in 1935 to commercialize this newly invented ferrite cores.
YearAdded:
2009
Image Credit: Courtesy Tokyo Institute of TechnologyImage Caption: A replica of the early soft-ferrite core.Era_date_from: 1930
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