Status Dismantled Destroyed 1985 Completed 1963 | Location Marcus Island, Japan Height 412 m Main contractor United States Coast Guard | |
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Type Mast radiator insulated against ground Similar Iwo Jima LORAN‑C transmitter, Minami‑Tori‑shima, NEC Supertower, Acty Shiodome, Sompo Japan Head Offi | ||
69 capital gate place tokyo skytree tokyo tower marcus island loran c transmitter
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). 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.