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| Keywords: Cutlervlf.jpg US Navy Cutler VLF Transmitter facility Maine as seen from across the Little Machias Bay of a distance of about 2 miles It transmits operational orders one-way to submerged submarines worldwide at a frequency of 24 kHz with a power of 1 8 megawatts and was at one time the most powerful radio station in the world This type of antenna is called a trideco or umbrella antenna a form of capacitively top-loaded monopole antenna It consists of an array of 13 vertical steel masts attached at the top to a system of horizontal cables like an 'umbrella The cables are divided into 6 panels which radiate out from the central tower in a pattern resembling a snowflake The central mast is 979 ft 298 meters tall and the entire array is 6140 ft 1 871 km or 1 16 miles in diameter The central mast actually radiates the VLF radio waves while the top cables form a large capacitor with the ground which serves to increase the efficiency of the antenna Under each mast there is also a system of cables suspended a few feet above the ground radiating from the mast base called a counterpoise not shown which functions as the other plate of the capacitor Own 2007-03-15 Noelle Keyser Released into the public domain by the author Radio stations in the United States United States Navy bases Washington County Maine Wire antenna | ||||
