Marcus Island LORAN-C transmitter

Marcus Island overview with transmitter
Marcus Island LORAN-C Mast (1st)
General information
Status Dismantled
Type Mast radiator insulated against ground
Location Marcus Island, Japan
Coordinates 24°17′8″N 153°58′54″E / 24.28556°N 153.98167°E / 24.28556; 153.98167
Completed 1963
Destroyed 1985
Height 411.5 m (1,350.07 ft)
Design and construction
Main contractor US Coast Guard
Marcus Island LORAN-C Mast (2nd)
General information
Status Dismantled
Type Mast radiator insulated against ground
Location Marcus Island, Japan
Coordinates 24°17′8″N 153°58′54″E / 24.28556°N 153.98167°E / 24.28556; 153.98167
Completed 1986
Destroyed 2000
Height 213.4 m (700.13 ft)
Design and construction
Main contractor US Coast Guard
Marcus Island LORAN-C Mast (3rd)
General information
Status Dismantled
Type Mast radiator insulated against ground
Location Marcus Island, Japan
Coordinates 24°17′8″N 153°58′54″E / 24.28556°N 153.98167°E / 24.28556; 153.98167
Completed 2000
Destroyed 2010
Height 213 m (698.82 ft)
Design and construction
Main contractor Japanese Coast Guard

Marcus Island LORAN-C transmitter (Minami Torishima LORAN-C transmitter) is a LORAN-C transmitter on Marcus Island (Minami Torishima) in Ogasawara, Tokyo, Japan at (24°17′8″N 153°58′54″E / 24.28556°N 153.98167°E / 24.28556; 153.98167Coordinates: 24°17′8″N 153°58′54″E / 24.28556°N 153.98167°E / 24.28556; 153.98167). 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 411.48 metre (1350 ft) tall guyed mast radiator as antenna, which was built in 1964.

In 1985/86 the 411.48 metre tower was replaced by a 213.4 metre tall tower.

In October 1993 the authority over the transmitter was transferred from the US Coast Guard to Japan Coast Guard. In 2000 the tower of the station was again dismantled and replaced by a new one with a height of 213 metres.

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 kW.

On December 1, 2009, the station was abolished due to a decline in users.[1]

See also

References

  1. ↑ "北西太平洋ロランCチェーンの縮小（南鳥島局の廃止）について" (PDF) (in Japanese). Japanese Coast Guard. 2009-06-01. Retrieved 2016-10-08.
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