LORAN-C transmitter Johnston Island
Encyclopedia
LORAN-C transmitter Johnston Island was a LORAN-C transmitter on Johnston Atoll
Johnston Atoll
Johnston Atoll is a atoll in the North Pacific Ocean about west of Hawaii. There are four islands located on the coral reef platform, two natural islands, Johnston Island and Sand Island, which have been expanded by coral dredging, as well as North Island and East Island , an additional two...

, in the mid-Pacific Ocean
Pacific Ocean
The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

. It was in service until July 1, 1992 and used as antenna
Antenna (radio)
An antenna is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver...

 a 190.5 metre ( 625 ft) tall mast radiator and a transmission power of 275 kW.

The antenna and all electrical equipment were located on Sand Island, northeast of the main island. Its tall antenna, guyed with four cables, was nearly in line with the extended centerline of the island's runway
Runway
According to ICAO a runway is a "defined rectangular area on a land aerodrome prepared for the landing and take-off of aircraft." Runways may be a man-made surface or a natural surface .- Orientation and dimensions :Runways are named by a number between 01 and 36, which is generally one tenth...

, so departing aircraft were required to initiate a shallow right turn soon after takeoff
Takeoff
Takeoff is the phase of flight in which an aerospace vehicle goes from the ground to flying in the air.For horizontal takeoff aircraft this usually involves starting with a transition from moving along the ground on a runway. For balloons, helicopters and some specialized fixed-wing aircraft , no...

to avoid the hazard. Shortly after the LORAN's decommissioning, the antenna was felled to remove that hazard.

External links

  • http://www.loran-history.info/downloads/LORAN-1.XLS
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