This articleneeds additional citations forverification.(April 2018) |
VLF transmitter Lualualeiis a facility of theUnited States NavynearLualualei, Hawaiitransmitting orders to submerged submarines in thevery low frequency(VLF) range.
| VLF transmitter Lualualei, Mast 1 | |
|---|---|
 | |
 | |
| General information | |
| Status | Completed |
| Type | Mast radiator insulated against ground |
| Location | Lualualei,Hawaii,United States |
| Coordinates | 21°25′13.38″N158°09′14.35″W/ 21.4203833°N 158.1539861°W |
| Completed | 1972 |
| Height | 458.11 m (1,503.0 ft) |
| Design and construction | |
| Main contractor | US Navy |
| VLF transmitter Lualualei, Mast 2 | |
|---|---|
 | |
| General information | |
| Status | Completed |
| Type | Mast radiator insulated against ground |
| Location | Lualualei,Hawaii,United States |
| Coordinates | 21°25′11.87″N158°08′53.67″W/ 21.4199639°N 158.1482417°W |
| Completed | 1972 |
| Height | 458.11 m (1,503.0 ft) |
| Design and construction | |
| Main contractor | US Navy |
Description
editVLF transmitterLualuale operates under the callsign NPM on 21.4 kHz and 23.4 kHz.
The station's current antenna was built in 1972; it consists of two guyed masts, each 458.11 metres (1503 feet) tall, which are configured asumbrella antennas.They are fed by an overhead cable, fixed to a tall mast at one end, and at the opposite end to a smaller grounded mast near thehelix buildingvia an insulator.
At the time they were built, they were the tallest towers used for military purposes in the Western hemisphere.[1]The two masts are also the tallest towers used forlong wave transmissionsin the Western hemisphere. Since the collapse ofWarsaw Radio Mast,they may be the world's tallest structures that are electrically insulated from the ground.
See also
editSources
edit- ^Graff, Garrett M. (2 May 2017).Raven Rock: The story of the U.S. Government's secret plan to save itself – while the rest of us die.Simon & Schuster.ISBN9781476735405.