| dbo:abstract |
Eine Vorhangantenne ist eine Richtantenne, welche üblicherweise für Rundfunksender auf Kurzwelle, beispielsweise bei der Kurzwellensendeanlage Wertachtal, verwendet wurde. (de) Curtain arrays are a class of large multielement directional radio transmitting wire antennas, used in the shortwave radio bands. They are a type of reflective array antenna, consisting of multiple wire dipole antennas, suspended in a vertical plane, often in front of a "curtain" reflector made of a flat vertical screen of many long parallel wires. These are suspended by support wires strung between pairs of tall steel towers, up to 90 m (300 feet) high. They are used for long-distance skywave (or skip) transmission; they transmit a beam of radio waves at a shallow angle into the sky just above the horizon, which is reflected by the ionosphere back to Earth beyond the horizon. Curtain antennas are mostly used by international short wave radio stations to broadcast to large areas at transcontinental distances. Because of their powerful directional characteristics, curtain arrays are often used in government propaganda radio stations to beam propaganda broadcasts over national borders into other nations. For example, curtain arrays were used by Radio Free Europe and Radio Liberty to broadcast into Eastern Europe. (en) |
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http://search.itu.int/history/HistoryDigitalCollectionDocLibrary/4.283.43.en.1041.pdf http://www.radioliberty.org http://tx.mb21.co.uk/features/skeltonvlf/skelton3.shtml http://tx.mb21.co.uk/gallery/woofferton/ http://www.bbceng.info/Operations/transmitter_ops/Reminiscences/Woofferton/woof50y-v2.pdf http://www.w8ji.com/curtain%20sterba%20USIA%20array.htm http://HireMe.geek.nz/ALLISS.html |
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dbr:Radio |
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Eine Vorhangantenne ist eine Richtantenne, welche üblicherweise für Rundfunksender auf Kurzwelle, beispielsweise bei der Kurzwellensendeanlage Wertachtal, verwendet wurde. (de) Curtain arrays are a class of large multielement directional radio transmitting wire antennas, used in the shortwave radio bands. They are a type of reflective array antenna, consisting of multiple wire dipole antennas, suspended in a vertical plane, often in front of a "curtain" reflector made of a flat vertical screen of many long parallel wires. These are suspended by support wires strung between pairs of tall steel towers, up to 90 m (300 feet) high. They are used for long-distance skywave (or skip) transmission; they transmit a beam of radio waves at a shallow angle into the sky just above the horizon, which is reflected by the ionosphere back to Earth beyond the horizon. Curtain antennas are mostly used by international short wave radio stations to broadcast to large areas at transco (en) |
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Vorhangantenne (de) Curtain array (en) |
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wikipedia-en:Curtain_array?oldid=1111810380&ns=0 |
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