{"id":32619,"date":"2019-10-31T21:48:00","date_gmt":"2019-10-31T18:48:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala\/"},"modified":"2019-10-31T21:48:00","modified_gmt":"2019-10-31T18:48:00","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala","title":{"rendered":"Telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 2: Zlo\u017eenie a forma sign\u00e1lu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 2: Zlo\u017eenie a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/7b3a15cd9dddaf07211c89457054d0cd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSign\u00e1l pren\u00e1\u0161an\u00fd cez sie\u0165 k\u00e1blovej telev\u00edzie predstavuje \u0161irokop\u00e1smov\u00e9, frekven\u010dne rozdelen\u00e9 spektrum. Parametre sign\u00e1lu, vr\u00e1tane frekvenci\u00ed a \u010d\u00edsel kan\u00e1lov na Slovensku, s\u00fa regulovan\u00e9 normami, ale naplnenie ka\u017ed\u00e9ho z kan\u00e1lov si oper\u00e1tor vol\u00ed pod\u013ea vlastn\u00e9ho uv\u00e1\u017eenia.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Obsah s\u00e9rie \u010dl\u00e1nkov<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">\u010cas\u0165 1: V\u0161eobecn\u00e1 architekt\u00fara siete KTV<\/a><\/noindex><\/li>\n<li>\u010cas\u0165 2: Zlo\u017eenie a tvar sign\u00e1lu<\/li>\n<li>\u010cas\u0165 3: Anal\u00f3gov\u00e1 zlo\u017eka sign\u00e1lu<\/li>\n<li>\u010cas\u0165 4: Digit\u00e1lna zlo\u017eka sign\u00e1lu<\/li>\n<li>\u010cas\u0165 5: Koaxi\u00e1lna distribu\u010dn\u00e1 sie\u0165<\/li>\n<li>\u010cas\u0165 6: RF zesil\u0148ova\u010de<\/li>\n<li>\u010cas\u0165 7: Optick\u00e9 prij\u00edma\u010de<\/li>\n<li>\u010cas\u0165 8: Optick\u00e1 magistr\u00e1lna sie\u0165<\/li>\n<li>\u010cas\u0165 9: Hlavn\u00e1 stanica<\/li>\n<li>\u010cas\u0165 10: H\u013eadanie a odstra\u0148ovanie por\u00fach v sieti KTV<\/li>\n<\/ul>\n<p>Pripom\u00ednam, \u017ee nep\u00ed\u0161em u\u010debnicu, ale osvetu pre roz\u0161\u00edrenie obzorov a vstup do sveta k\u00e1blovej TV. Preto sa sna\u017e\u00edm p\u00edsa\u0165 jednoduch\u00fdm jazykom, pri\u010dom k\u013e\u00fa\u010dov\u00e9 slov\u00e1 ponech\u00e1vam pre zauj\u00edmav\u00fdch a neprehlbujem sa do opisovania technol\u00f3gi\u00ed, ktor\u00e9 s\u00fa aj bez m\u0148a v\u00fdsti\u017ene op\u00edsan\u00e9 mnohokr\u00e1t.<\/p>\n<h1>\u010c\u00edm meriame<\/h1>\n<p>\nNa z\u00edskanie inform\u00e1ci\u00ed o sign\u00e1le v koaxi\u00e1lnom k\u00e1bli n\u00e1\u0161 technick\u00fd person\u00e1l najm\u00e4 pou\u017e\u00edva pr\u00edstroj Deviser DS2400T<br \/>\n<img decoding=\"async\" alt=\"Telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 2: Zlo\u017eenie a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/16736bb28accd24fa63aba18629d83eb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nV podstate ide o telev\u00edzny prij\u00edma\u010d, ale namiesto obrazu a zvuku vid\u00edme kvantitat\u00edvne a kvalitat\u00edvne charakteristiky cel\u00e9ho spektra aj jednotliv\u00fdch kan\u00e1lov. N\u00e1sledne uveden\u00e9 ilustr\u00e1cie s\u00fa sn\u00edmky z tohto pr\u00edstroja.<\/p>\n<p>Tak\u00fd Deviser m\u00e1 dokonca nieko\u013eko prebyto\u010dn\u00fdch funkci\u00ed, ale s\u00fa aj pr\u00edstroje kvalitnej\u0161ie: s obrazovkou, ktor\u00e1 priamo zobrazuje telev\u00edzny obraz, a pr\u00edjmom optick\u00e9ho sign\u00e1lu a toho, \u010do Deviser nem\u00e1, pr\u00edjem satelitn\u00e9ho sign\u00e1lu DVB-S (ale to je \u00faplne in\u00fd pr\u00edbeh).<\/p>\n<h1>Spektrum sign\u00e1lu<\/h1>\n<p>\nR\u00fdchlo pos\u00fadi\u0165 stav sign\u00e1lu 'na oko' umo\u017e\u0148uje re\u017eim zobrazenia spektra<\/p>\n<p><img decoding=\"async\" alt=\"Telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 2: Zlo\u017eenie a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/2b012db5798f40c20514290ed44d89e4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nV tomto re\u017eime pr\u00edstroj vykon\u00e1va skenovanie kan\u00e1lov v s\u00falade s nastaven\u00fdm frekven\u010dn\u00fdm pl\u00e1nom. Pre pohodlie s\u00fa z celkov\u00e9ho spektra odstr\u00e1nen\u00e9 nevyu\u017e\u00edvan\u00e9 frekvencie, preto v\u00fdsledn\u00fd obraz predstavuje rad kan\u00e1lov.<\/p>\n<p><img decoding=\"async\" alt=\"Telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 2: Zlo\u017eenie a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/f6817317f6d0918c03eedd7f5684023e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nModrou farbou s\u00fa ozna\u010den\u00e9 digit\u00e1lne kan\u00e1ly, \u017eltou \u2013 anal\u00f3gov\u00e9. Zelen\u00e1 \u010das\u0165 anal\u00f3gov\u00e9ho kan\u00e1la predstavuje jeho zvukov\u00fa zlo\u017eku.<\/p>\n<p>Dobre vidite\u013en\u00fd je rozdiel v \u00farovniach r\u00f4znych kan\u00e1lov: jednotliv\u00e1 nerovnomernos\u0165 z\u00e1vis\u00ed od nastaven\u00ed transpond\u00e9rov na hlavnej stanici, a celkov\u00e9 rozdiely medzi vy\u0161\u0161\u00edmi a ni\u017e\u0161\u00edmi frekvenciami maj\u00fa ur\u010dit\u00e9 vy\u017eadovanie, o ktorom sa dozviete ni\u017e\u0161ie.<\/p>\n<p>V tomto re\u017eime bud\u00fa jasne vidite\u013en\u00e9 siln\u00e9 odch\u00fdlky od normy a ak s\u00fa v sieti v\u00e1\u017ene probl\u00e9my, okam\u017eite sa to prejav\u00ed. Napr\u00edklad na uvedenom obr\u00e1zku je vidie\u0165 vynechanie dvoch digit\u00e1lnych kan\u00e1lov v oblasti vysok\u00fdch frekvenci\u00ed: s\u00fa pr\u00edtomn\u00e9 len vo forme kr\u00e1tkych pr\u00fa\u017ekov, ktor\u00e9 sotva dosahuj\u00fa \u00farove\u0148 10 dBmkV (hore je uveden\u00e1 referen\u010dn\u00e1 \u00farove\u0148 80 dBmkV \u2014 to je horn\u00e1 hranica grafu), \u010do je v podstate \u0161um, ktor\u00fd k\u00e1bel prij\u00edma ako ant\u00e9na alebo ktor\u00fd zav\u00e1dza akt\u00edvne zariadenie. Tieto dva kan\u00e1ly s\u00fa testovacie a boli vypnut\u00e9 v \u010dase p\u00edsania \u010dl\u00e1nku.<\/p>\n<p>Zamie\u0148a\u0165 m\u00f4\u017ee nerovnomern\u00e9 umiestnenie digit\u00e1lnych a anal\u00f3gov\u00fdch kan\u00e1lov. To samozrejme nie je spr\u00e1vne a stalo sa to v d\u00f4sledku evolu\u010dn\u00e9ho v\u00fdvoja siete: do frekven\u010dn\u00e9ho pl\u00e1nu sa jednoducho prid\u00e1vali \u010fal\u0161ie kan\u00e1ly do vo\u013enej \u010dasti spektra. Pri vytv\u00e1ran\u00ed frekven\u010dn\u00e9ho pl\u00e1nu od nuly by bolo spr\u00e1vne umiestni\u0165 cel\u00fd anal\u00f3g v dolnej \u010dasti spektra. Navy\u0161e, pre stanice, ktor\u00e9 s\u00fa ur\u010den\u00e9 na formovanie sign\u00e1lu pre eur\u00f3pske krajiny, existuj\u00fa obmedzenia na pou\u017e\u00edvanie frekvenci\u00ed na vysielanie digit\u00e1lneho sign\u00e1lu a aj ke\u010f v na\u0161ej krajine tak\u00e9 obmedzenia nie s\u00fa, pri pou\u017e\u00edvan\u00ed tak\u00e9ho zariadenia mus\u00edme umiestni\u0165 digit\u00e1lne kan\u00e1ly do spektra napriek logike.<\/p>\n<h1>Forma sign\u00e1lu<\/h1>\n<p>\nAko je zn\u00e1me z fundament\u00e1lnej fyziky, \u010d\u00edm vy\u0161\u0161ia je frekvencia vlny, t\u00fdm silnej\u0161ie je jej z\u00e1nik pri \u0161\u00edren\u00ed. Pri prenose tak\u00e9ho \u0161irokop\u00e1smov\u00e9ho sign\u00e1lu, ako je ten, ktor\u00fd je v sieti KTV, m\u00f4\u017ee z\u00e1nik v distribuovanej sieti dosahova\u0165 desiatky decibelov na ramene, pri\u010dom v dolnej \u010dasti spektra bude nieko\u013ekokr\u00e1t men\u0161\u00ed. Preto, ak po\u0161leme do rozvodne z pivnice rovn\u00fd sign\u00e1l, na 25. poschod\u00ed uvid\u00edme pribli\u017ene nasleduj\u00face:<\/p>\n<p><img decoding=\"async\" alt=\"Telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 2: Zlo\u017eenie a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/df8b02e3904023bb254de8f1dd9d7d3c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00darove\u0148 horn\u00fdch frekvenci\u00ed je zrete\u013ene ni\u017e\u0161ia ako doln\u00fdch. V skuto\u010dnej situ\u00e1cii m\u00f4\u017ee telev\u00edzor, bez toho aby sa zamyslel, pova\u017eova\u0165 slab\u0161ie kan\u00e1ly jednoducho za \u0161um a filtrova\u0165 ich. A ak je v byte nain\u0161talovan\u00fd zosil\u0148ova\u010d, pokus o jeho nastavenie pre kvalitn\u00fd pr\u00edjem kan\u00e1lov z hornej \u010dasti p\u00e1sma m\u00f4\u017ee sp\u00f4sobi\u0165 preosilnenie v dolnej \u010dasti. \u0160tandardy upravuj\u00fa rozdiel na maxim\u00e1lne 15 dBmkV v celom p\u00e1sme.<\/p>\n<p>Aby sa tomu predi\u0161lo, pri nastavovan\u00ed akt\u00edvneho zariadenia sa p\u00f4vodne nastavuje vy\u0161\u0161ia \u00farove\u0148 v oblasti vysok\u00fdch frekvenci\u00ed. Toto sa naz\u00fdva \u201epriame sklon,\u201c alebo jednoducho \u201esklon.\u201c A to, \u010do je zobrazen\u00e9 na obr\u00e1zku, je \u201esp\u00e4tn\u00fd sklon\u201c a tak\u00fd obr\u00e1zok znamen\u00e1 hav\u00e1riu. Alebo minim\u00e1lne nazna\u010duje, \u017ee s k\u00e1blom smerom k miestu merania je nie\u010do v poriadku. <\/p>\n<p>Niekedy je situ\u00e1cia opa\u010dn\u00e1, ke\u010f s\u00fa n\u00edzke frekvencie takmer absentuj\u00face, zatia\u013e \u010do vy\u0161\u0161ie frekvencie sa sotva dost\u00e1vaj\u00fa nad \u00farove\u0148 \u0161umu:<\/p>\n<p><img decoding=\"async\" alt=\"Telev\u00edzne siete pre najmen\u0161\u00edch. \u010cas\u0165 2: Zlo\u017eenie a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/a69fd310c5115b09f4cdf6d209e04fef.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTo n\u00e1m tie\u017e hovor\u00ed o po\u0161koden\u00ed k\u00e1bla, konkr\u00e9tne jeho centr\u00e1lneho vodi\u010da: \u010d\u00edm vy\u0161\u0161ia je frekvencia, t\u00fdm bli\u017e\u0161ie k okraju vlnen\u00e9ho vodi\u010da sa \u0161\u00edri (skin efekt v koaxi\u00e1lnom k\u00e1bli). Preto vid\u00edme iba tie kan\u00e1ly, ktor\u00e9 sa \u0161\u00edria na vy\u0161\u0161\u00edch frekvenci\u00e1ch, ale ako zvy\u010dajne, telev\u00edzor ich s takouto \u00farov\u0148ou u\u017e neprijme.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0438\u0433\u043d\u0430\u043b, \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0439 \u043f\u043e \u0441\u0435\u0442\u0438 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0438\u0437 \u0441\u0435\u0431\u044f \u0448\u0438\u0440\u043e\u043a\u043e\u043f\u043e\u043b\u043e\u0441\u043d\u044b\u0439, \u0447\u0430\u0441\u0442\u043e\u0442\u043d\u043e \u0440\u0430\u0437\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0439 \u0441\u043f\u0435\u043a\u0442\u0440. \u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0441\u0438\u0433\u043d\u0430\u043b\u0430, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0447\u0430\u0441\u0442\u043e\u0442\u044b \u0438 \u043d\u043e\u043c\u0435\u0440\u0430 \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u0432 \u0420\u043e\u0441\u0441\u0438\u0438 \u0440\u0435\u0433\u043b\u0430\u043c\u0435\u043d\u0442\u0438\u0440\u0443\u044e\u0442\u0441\u044f \u0413\u041e\u0421\u0422 7845-92 \u0438 \u0413\u041e\u0421\u0422 \u0420 52023-2003, \u043d\u043e \u043d\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u0438\u0437 \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 \u0432\u043e\u043b\u0435\u043d \u0432\u044b\u0431\u0438\u0440\u0430\u0442\u044c \u043d\u0430 \u0441\u0432\u043e\u0451 \u0443\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0438\u0435. \u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u0427\u0430\u0441\u0442\u044c 1: \u041e\u0431\u0449\u0430\u044f \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0430 \u0441\u0435\u0442\u0438 \u041a\u0422\u0412 \u0427\u0430\u0441\u0442\u044c 2: \u0421\u043e\u0441\u0442\u0430\u0432 \u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":24410,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32619","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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