LORAN-C transmitter mast Minami-Torishima

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LORAN-C transmitter mast Minami-Torishima
南 鳥島 ロ ラ ン C 局
GRI 8930
Image of the object
Aerial view of Minami-Torishima
Basic data
Place: Minami-Torishima
Prefecture: Okinawa
Country: Japan
Coordinates: 24 ° 17 ′ 9.5 ″  N , 153 ° 58 ′ 52.3 ″  E
Use: Telecommunications mast
Accessibility: Transmission mast not open to the public
Owner : Japanese Coast Guard
Mast data
Construction time : 1964
Last conversion (mast) : 2000
Total height : 213  m
Data on the transmission system
Last modification (transmitter) : 2000
Waveband : LW transmitter
Send type: Radio navigation
Position map
LORAN-C transmitter mast Minami-Torishima (Pacific Ocean)
LORAN-C transmitter mast Minami-Torishima
LORAN-C transmitter mast Minami-Torishima

The LORAN-C transmission tower Minami-Torishima ( Jap. 南鳥島ロランC局 , Minami-Torishima Roran-shī-kyoku ; Engl. Marcus Iceland LORAN-C Transmitter ) is a LORAN-C - transmission tower of the Japan Coast Guard on Minami-Torishima (Marcus Island). It was originally built and operated by the US Coast Guard . It is still used today to send data in the long-wave frequency range over very long distances. Until 1993 it was part of the grid 9970 and with 4000 kW one of the most powerful stations worldwide.

history

In 1964, the US Coast Guard completed the first self-radiating transmission mast on the island with a height of 411.48 meters. This made it the tallest structure in Japan and clearly relegated the 333 m high Tokyo Tower to second place. The first mast was dismantled in 1985 and replaced by a second smaller, 213.4 m high mast the following year. The Tokyo Tower thus once again took over the title of the tallest structure in Japan, until it was surpassed by the Tokyo Skytree in 2012 .

In 1993 the US handed the facility over to the Japanese Coast Guard. Up to this year the plant was operated with an output of 4000 kW. The second mast was demolished in 2000 and replaced by a more modern, 213 m high mast. The power was reduced to 1100 kW and became part of the LORAN-C transmitter chain GRI 8930.

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