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Woodside Omega Transmitter (station G, now Woodside VLF transmitter) near Woodside, Victoria, Australia was an Omega transmitter that used an umbrella antenna carried by a tall grounded lattice steel guyed mast. Unlike many of the other Omega Transmitters, Woodside was not a "hot tower," that is, one which is insulated from a ground connection by large ceramic insulators that support the entire weight of the structure. Rather, the tower was electrically insulated from the topmost guys which served as the radiators, similar to the metal radials of an umbrella without cloth covering. The mast simply supported the downward sloping guy wires which are the active elements. The guy wires were also used to hold the tower itself in place.〔( Australia - HAIKU VALLEY )〕 This mast was the tallest structure in the southern hemisphere.〔List of tallest structures in the world by country〕 Construction of this station was originally planned to be built in New Zealand but after protests from anti-war protestors it was built in Australia,〔( Antipodean Mariner - Omega Navigation System )〕 although not without controversy. The tower was officially opened in October 1982, but had been operating for 3 months prior to that, with the first broadcast at 10am on the 16th of August, having taken 3.5 years to construct. After the shutdown of the OMEGA navigation system on 30 September 1997, the station was used as a transmitter for uni-directional communications to submarines on 13 kHz under the callsign VL3DEF until 2004. Until December 2008, it had been transmitting a 100 baud MSK modulated signal on 18.6 kHz. 〔( Curtain draws on Cold War icon - ABC Gippsland Vic - Australian Broadcasting Corporation )〕 ==Current status== The station was decommissioned in November 2008. Aircraft warning lights continued to operate on each of the 10 43m platforms, however some of these lights had stopped working. Transmission equipment from the Omega navigation system is now on display at the Port Albert Maritime Museum.〔( Port Albert Maritime Museum )〕〔( Culture Victoria - Port Albert Maritime Museum )〕 On 25 January 2014 a BASE jumper was killed during an attempt to parachute from the tower. The station was demolished by explosives on 22 April 2015. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「VLF Transmitter Woodside」の詳細全文を読む スポンサード リンク
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