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| Keywords: Jim Creek VLF antenna.png Antenna of US Navy Jum Creek VLF Radio Station near Oso Washington State USA It transmits at VLF frequencies usually around 24 kHz with an output power of 1 2 megawatts one of the most powerful radio stations in the world The main purpose of this station is to communicate one way with submerged submarines of the Pacific Fleet The antenna called a valley span antenna consists of 10 catenary cables suspended by 200 ft towers over the valley between Wheeler Mountain and Blue Mountain in a zigzag pattern Each cable is driven at the center by a short vertical cable which drops down to a transmission line bus which is comes from the transmitter building in the center It functions as a capacitively top-loaded monopole antenna; the vertical cables are the main radiating elements and the horizontal cables add capacitance to the top of the antenna to improve efficiency The antenna is divided into two sections which normally operate as one but each can operate as a separate antenna so that maintenance can be performed on one half without interrupting transmission The valley under the antenna has an extensive counterpoise ground system consisting of a network of cables suspended close to the ground http //www navy-radio com/manuals/0101-1xx/0101_113-03 pdf NAVELEX 0101 113 Naval Shore Electronics Criteria VLF LF and MF Communication Systems FSN 0280-901-1000 Naval Electronic Systems Command Dept of the Navy August 1972 p 3-15 Fig 3-9 on Nick Englund's http //www navy-radio com/index htm US Navy Radio Communications website 1972-08 US Navy Electronic Systems Command PD-USGov-Military-Navy Original upload log en wikipedia FtCG page en wikipedia Jimcreekdiagram png wikitable - 17 37 1 April 2011 628 × 350 44 969 bytes Mcg410 w en <nowiki> Diagram of Jim Creek Antenna Array NAVELEX 0101 113 Fig 3-9 August 1972 US Navy </nowiki> Antenna diagrams Wire antenna | ||||
