{"id":803,"date":"2011-07-05T08:28:00","date_gmt":"2011-07-05T06:28:00","guid":{"rendered":"https:\/\/kids.esa.int\/satellite_television\/"},"modified":"2026-10-08T00:32:26","modified_gmt":"2026-10-07T22:32:26","slug":"satellite_television","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/satellite_television\/","title":{"rendered":"Satelliittitelevisio"},"content":{"rendered":"
\n

Nyky\u00e4\u00e4n pid\u00e4mme itsest\u00e4\u00e4n selv\u00e4n\u00e4, ett\u00e4 voimme seurata suorana televisioituja kuvia tapahtumista, kuten jalkapallon maailmanmestaruuskilpailuista tai olympialaisista. N\u00e4m\u00e4 kuvat ovat usein matkustaneet ruudullesi maailman toiselta puolelta.<\/p>\n<\/div>\n

T\u00e4m\u00e4n mahdollistaa geostationaarisella kiertoradalla oleva viestint\u00e4satelliittien rengas. N\u00e4m\u00e4 satelliitit lent\u00e4v\u00e4t noin 36 000 km:n korkeudella p\u00e4iv\u00e4ntasaajan yl\u00e4puolella, ja ne n\u00e4ytt\u00e4v\u00e4t leijuvan saman maapallon pinnan osan yl\u00e4puolella. Ne vastaanottavat televisiosignaaleja maassa sijaitsevista lautasantenneista ja vahvistavat niit\u00e4. Sitten satelliitti l\u00e4hett\u00e4\u00e4 kuvat ja \u00e4\u00e4nen edelleen katsojille.<\/p>\n

Satelliittitelevision nykyaika alkoi hein\u00e4kuussa 1962, kun Telstar 1 v\u00e4litti ensimm\u00e4iset suorat televisio-ohjelmat Yhdysvalloista Isoon-Britanniaan. Vuonna 1965 Early Birdista tuli ensimm\u00e4inen satelliitti, jota k\u00e4ytettiin s\u00e4\u00e4nn\u00f6llisiin televisiol\u00e4hetyksiin Pohjois-Amerikan ja Euroopan v\u00e4lill\u00e4.<\/p>\n

Aiemmin televisiosignaalit oli l\u00e4hetett\u00e4v\u00e4 erityisten maa-asemien suuriin lautasantenneihin, ennen kuin ne voitiin v\u00e4litt\u00e4\u00e4 paikallisille antenneille. Nyky\u00e4\u00e4n satelliittisignaalit ovat niin voimakkaita, ett\u00e4 ne voidaan vastaanottaa toimistojen ja talojen katoilla olevilla pienill\u00e4 lautasanteneilla. T\u00e4m\u00e4 suoraan kotiin toimitettava digitaalitelevisio on tullut eritt\u00e4in suosituksi monissa maissa.<\/p>\n

Reaaliaikaisia satelliittiyhteyksi\u00e4 voidaan my\u00f6s luoda et\u00e4isten toimistojen v\u00e4lill\u00e4 tai kaupunkien sairaaloissa ty\u00f6skentelevien l\u00e4\u00e4k\u00e4reiden ja syrj\u00e4isiss\u00e4 maaseutukyliss\u00e4 asuvien potilaiden v\u00e4lill\u00e4. Satelliitteja k\u00e4ytet\u00e4\u00e4n my\u00f6s digitaalisiin radiol\u00e4hetyksiin, joita voidaan vastaanottaa autoissa ja kannettavissa radioissa.<\/p>","protected":false},"excerpt":{"rendered":"

Today, we take it for granted that we can see live TV pictures of events such as the World Cup or the Olympic Games. These pictures have often travelled to […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2008\/11\/satellite_control_software_expertise_simplifies_digital_tv_channel_broadcasting2\/17878107-2-eng-GB\/Satellite_control_software_expertise_simplifies_digital_TV_channel_broadcasting.jpg","esa_banner_description":"","esa_banner_credit":"AFP","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/11\/Satellite_control_software_expertise_simplifies_digital_TV_channel_broadcasting2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,65,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-803","post","type-post","status-publish","format-standard","hentry","category-learn","category-mission-control","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/803","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=803"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/803\/revisions"}],"predecessor-version":[{"id":1946,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/803\/revisions\/1946"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=803"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=803"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=803"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=803"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=803"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=803"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=803"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=803"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=803"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=803"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}