Marcus Island LORAN-C transmitter, or Minami Torishima LORAN-C transmitter, is a former

LORAN-C Loran-C is a hyperbolic radio navigation system that allows a receiver to determine its position by listening to low frequency radio signals that are transmitted by fixed land-based radio beacons. Loran-C combined two different techniques to ...

transmitter on

Minami-Tori-shima , also known as Marcus Island, is an isolated Japanese coral atoll in the northwestern Pacific Ocean, located some southeast of Tokyo and east of the closest Japanese island, South Iwo Jima of the Ogasawara Islands, and nearly on a straight li ...

(Marcus Island) in

Ogasawara, Tokyo is a village in Ogasawara Subprefecture, Tokyo Metropolis, Japan, that governs the Bonin Islands, Volcano Islands, and three remote islands ( Nishinoshima, Minamitorishima and Okinotorishima). History In 1940, five municipalities were crea ...

, Japan at (). Until 1993 it was part of Grid 9970 and used a transmission power of 4000 kilowatts, which was more than the most powerful broadcasting stations ever used. Until 1985 Marcus Island LORAN-C transmitter had a tall guyed

mast radiator Mast, MAST or MASt may refer to: Engineering * Mast (sailing), a vertical spar on a sailing ship * Flagmast, a pole for flying a flag * Guyed mast, a structure supported by guy-wires * Mooring mast, a structure for docking an airship * Radio ma ...

as an antenna, which was built in 1964. In 1985/86 this tower was replaced by a tall tower. In October 1993 the authority over the transmitter was transferred from the

United States Coast Guard The United States Coast Guard (USCG) is the maritime security, search and rescue, and law enforcement service branch of the United States Armed Forces and one of the country's eight uniformed services. The service is a maritime, military, mu ...

to the

Japan Coast Guard The is the coast guard of Japan. The Japan Coast Guard consists of about 13,700 personnel and is responsible for the protection of the coastline of Japan under the oversight of the Ministry of Land, Infrastructure, Transport and Tourism. Th ...

. In 2000 the tower of the station was again dismantled and replaced by a new one with a height of 213 meters. Marcus Island LORAN-C transmitter was the X-Ray secondary station of the North West Pacific LORAN-C Chain GRI 8930. Its transmission power was reduced to 1100 kilowatts. On December 1, 2009, the station was abolished due to a decline in users. The mast has been demolished.

References

External links

Excel-File with information about LORAN-C transmitters
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Building 56828

Building 57079

Building 57185
* * * {{DEFAULTSORT:Marcus Island Loran-C Transmitter LORAN-C transmitters in Japan Buildings and structures in Tokyo

See also

References

External links