Marcus Island LORAN-C transmitter
| Marcus Island LORAN-C Mast (1st) | |
|---|---|
 | |
| General information | |
| 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 |
| 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 | |
| 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 |
| 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 | |
| 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 |
| 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). 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
- ^ "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.
External links
- Excel-File with information about LORAN-C transmitters
- Marcus Island at the Wayback Machine (archived December 13, 2010)
- Image Gallery at the Wayback Machine (archived December 13, 2010)
- http://skyscraperpage.com/cities/?buildingID=56828
- http://skyscraperpage.com/cities/?buildingID=57079
- http://skyscraperpage.com/cities/?buildingID=57185
- Minami Torishima LORAN-C transmission mast (1964) at Structurae
- Minami Torishima LORAN-C transmission mast (1986) at Structurae
- Minami Torishima LORAN-C transmission mast (1993) at Structurae
