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.
Antennae
![First Transpacific Reception of a Television (TV) Signal via Satellite](/sites/default/files/styles/landmark_node_/public/2018-03/Relay_1.jpg?itok=uH5F6PoB)
YearAdded:
Image Caption: Artist's vision of NASA Relay 1 satelliteEra_date_from: 1963
2009
![](/sites/default/files/styles/landmark_node_/public/directive_short_wave_antenna.jpg?itok=8L7FZL9C)
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:
Image Credit: Courtesy IEEEImage Caption: The Yagi-Uda directive short wave antennaEra_date_from: 1924
1995
![](/sites/default/files/styles/landmark_node_/public/development_ferrite_core.jpg?itok=oayqtvDB)
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:
Image Credit: Courtesy Tokyo Institute of TechnologyImage Caption: A replica of the early soft-ferrite core.Era_date_from: 1930
2009
Innovations
![](/sites/default/files/styles/thumbnail/public/development_ferrite_core.jpg?itok=rrCSthWp)
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… Read More
![](/sites/default/files/styles/thumbnail/public/directive_short_wave_antenna.jpg?itok=teEbjM5k)
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… Read More
![First Transpacific Reception of a Television (TV) Signal via Satellite](/sites/default/files/styles/thumbnail/public/2018-03/Relay_1.jpg?itok=u_Tlg4Fo)
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…
Read More