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| Keywords: Trideco.png Diagram of Trideco type VLF antenna This is a very large wire antenna often over a mile in diameter used by powerful transmitters in the very low frequency band A type of umbrella antenna it consists of 13 steel radio towers arranged in two concentric circles with a network of cables linking the tops The cables are arranged in six panels extending from the central tower in a hexagonal snowflake pattern The central tower usually serves as the radiating element acting as a monopole radiator while the horizontal suspended cables act as a large capacitive top-load forming a capacitor with the ground which increases the current in the vertical element increasing the radiated power The transmitter power is applied between the bottom of the central tower and a ground connection VLF antennas require an extremely low resistance ground so the ground under the antenna is usually covered by a counterpoise a radial screen of wires suspended a few feet off the ground A major use of trideco antennas is in powerful Naval transmitters which communicate with submerged submarines NAVELEX 0101 113 Fig 3-7 1972-08 US Navy Naval Electronics Systems Command PD-USGov-Military-Navy Original upload log en wikipedia ftcg page en wikipedia Trideco png wikitable - 17 30 1 April 2011 916 × 1 196 100 687 bytes Mcg410 w en <nowiki> Diagram of Trideco type VLF Antenna NAVELEX 0101 113 Fig 3-7 August 1972 US Navy Naval Electronics Systems Command </nowiki> U S Naval Communication Station Harold E Holt Exmouth Western Australia Files transferred from Wikipedia by Josve05a | ||||
