Vortex (Satellite)
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High Quality Content by WIKIPEDIA articles! Vortex, previously known as Chalet, is a class of spy satellite operated by the United States during the 1980s and 1990s to collect signals intelligence (SIGINT) from high Earth orbit. The Vortex satellites were operated by the National Reconnaissance Office for the United States Air Force and listened to radio transmissions originating from Earth or space. The intercepted data is believed to have been fed into and analyzed by the National Security Agency ECHELON system.The satellites weigh approximately 1,800 kilograms and are operated from geosynchronous orbits.…mehr

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High Quality Content by WIKIPEDIA articles! Vortex, previously known as Chalet, is a class of spy satellite operated by the United States during the 1980s and 1990s to collect signals intelligence (SIGINT) from high Earth orbit. The Vortex satellites were operated by the National Reconnaissance Office for the United States Air Force and listened to radio transmissions originating from Earth or space. The intercepted data is believed to have been fed into and analyzed by the National Security Agency ECHELON system.The satellites weigh approximately 1,800 kilograms and are operated from geosynchronous orbits.