Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Communications_satellite> ?p ?o }
- Communications_satellite abstract "A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver(s) at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. There are over 2,000 communications satellites in Earth’s orbit, used by both private and government organizations.Wireless communication uses electromagnetic waves to carry signals. These waves require line-of-sight, and are thus obstructed by the curvature of the Earth. The purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated points.The electromagnetic signals that communication satellites work with, have a large spectrum of wavelengths and frequencies. To keep these waves from interfering with one another, international organizations have certain rules and regulations describing which wavelength a certain company or group can use. By separating out wavelengths, communication satellites will have minimal interference and be able to communicate effectively.There are two major classes of communications satellites, passive and active. Passive satellites only reflect the signal coming from the source, toward the direction of the receiver. With passive satellites, the reflected signal is not amplified at the satellite, and only a very small amount of the transmitted energy reflects toward the receiver. Since the satellite is so far above Earth the radio signal is attenuated on its long journey due to free-space path loss, so the signal received on Earth is very weak. Active satellites, on the other hand, amplify the received signal before re-transmitting it to the receiver on the ground Passive satellites were the first communications satellites, but are little used now.".
- Communications_satellite thumbnail AEHF_1.jpg?width=300.
- Communications_satellite wikiPageExternalLink sp4217.htm.
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- Communications_satellite wikiPageExternalLink anik-g1-telecommunications-satellite.
- Communications_satellite wikiPageExternalLink 1113.
- Communications_satellite wikiPageExternalLink index.
- Communications_satellite wikiPageExternalLink www.esoa.net.
- Communications_satellite wikiPageExternalLink satcomhistory.html.
- Communications_satellite wikiPageExternalLink default.aspx.
- Communications_satellite wikiPageExternalLink www.prmt.com.
- Communications_satellite wikiPageExternalLink www.satcom.co.uk.
- Communications_satellite wikiPageExternalLink www.satmagazine.com.
- Communications_satellite wikiPageExternalLink www.satnews.com.
- Communications_satellite wikiPageExternalLink www.sia.org.
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- Communications_satellite wikiPageWikiLink 1964_Summer_Olympics.
- Communications_satellite wikiPageWikiLink AMC-3.
- Communications_satellite wikiPageWikiLink AT&T_Corporation.
- Communications_satellite wikiPageWikiLink ATS-6.
- Communications_satellite wikiPageWikiLink Africa.
- Communications_satellite wikiPageWikiLink Amateur_radio.
- Communications_satellite wikiPageWikiLink Amateur_radio_satellite.
- Communications_satellite wikiPageWikiLink American_Broadcasting_Company.
- Communications_satellite wikiPageWikiLink Angular_velocity.
- Communications_satellite wikiPageWikiLink Anik_(satellite).
- Communications_satellite wikiPageWikiLink Antarctica.
- Communications_satellite wikiPageWikiLink Antenna_(radio).
- Communications_satellite wikiPageWikiLink Arthur_C._Clarke.
- Communications_satellite wikiPageWikiLink Ascension_Island.
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- Communications_satellite wikiPageWikiLink Backhaul_(broadcasting).
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- Communications_satellite wikiPageWikiLink Bandwidth_(signal_processing).
- Communications_satellite wikiPageWikiLink Bell_Labs.
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- Communications_satellite wikiPageWikiLink Category:American_inventions.
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- Communications_satellite wikiPageWikiLink Category:Satellites_by_type.
- Communications_satellite wikiPageWikiLink Channel_(communications).
- Communications_satellite wikiPageWikiLink China.
- Communications_satellite wikiPageWikiLink Christian_Broadcasting_Network.
- Communications_satellite wikiPageWikiLink Circular_polarization.
- Communications_satellite wikiPageWikiLink Commercialization_of_space.
- Communications_satellite wikiPageWikiLink Communication_Moon_Relay.
- Communications_satellite wikiPageWikiLink Corporate_video.
- Communications_satellite wikiPageWikiLink Courier_1B.
- Communications_satellite wikiPageWikiLink DStv.
- Communications_satellite wikiPageWikiLink Defense_Satellite_Communications_System.
- Communications_satellite wikiPageWikiLink Diego_Garcia.
- Communications_satellite wikiPageWikiLink Digital_cinema.
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- Communications_satellite wikiPageWikiLink Dish_Network.
- Communications_satellite wikiPageWikiLink Distance_education.
- Communications_satellite wikiPageWikiLink Dwight_D._Eisenhower.
- Communications_satellite wikiPageWikiLink Easter_Island.
- Communications_satellite wikiPageWikiLink Electromagnetic_radiation.
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- Communications_satellite wikiPageWikiLink Europe.
- Communications_satellite wikiPageWikiLink Eutelsat.
- Communications_satellite wikiPageWikiLink Extremely_high_frequency.
- Communications_satellite wikiPageWikiLink F_band.
- Communications_satellite wikiPageWikiLink Feature_film.
- Communications_satellite wikiPageWikiLink Federal_Communications_Commission.
- Communications_satellite wikiPageWikiLink Fixed-satellite_service.
- Communications_satellite wikiPageWikiLink Fleet_Satellite_Communications_System.
- Communications_satellite wikiPageWikiLink Free-space_path_loss.
- Communications_satellite wikiPageWikiLink Free-to-air.
- Communications_satellite wikiPageWikiLink Freeform_(TV_channel).
- Communications_satellite wikiPageWikiLink Freesat.
- Communications_satellite wikiPageWikiLink GSAT-7.
- Communications_satellite wikiPageWikiLink Galaxy_10R.
- Communications_satellite wikiPageWikiLink Galaxy_25.
- Communications_satellite wikiPageWikiLink General_Post_Office.
- Communications_satellite wikiPageWikiLink Geostationary_orbit.
- Communications_satellite wikiPageWikiLink Geosynchronous_orbit.
- Communications_satellite wikiPageWikiLink Global_Command_and_Control_System.
- Communications_satellite wikiPageWikiLink Global_Positioning_System.
- Communications_satellite wikiPageWikiLink Globalstar.
- Communications_satellite wikiPageWikiLink Greenland.