{"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\/sq\/blog\/novosti-interneta\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala","title":{"rendered":"Rrjetet e kabllove t\u00eb televizionit p\u00ebr m\u00eb t\u00eb vegjlit. Pjesa 2: Kompozimi dhe forma e sinjalit.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Rrjetet e kabllove t\u00eb televizionit p\u00ebr m\u00eb t\u00eb vegjlit. Pjesa 2: Kompozimi dhe forma e sinjalit.\" src=\"\/wp-content\/uploads\/2019\/04\/7b3a15cd9dddaf07211c89457054d0cd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSinjali i transmetuar p\u00ebrmes rrjetit t\u00eb televizionit me kabllo p\u00ebrb\u00ebn nj\u00eb spekt\u00ebr t\u00eb gjer\u00eb, me frekuenca t\u00eb ndara. Parametrat e sinjalit, p\u00ebrfshir\u00eb frekuencat dhe numrat e kanaleve n\u00eb Shqip\u00ebri, rregullohen nga standardet e GOST 7845-92 dhe GOST R 52023-2003, por mbushja e secilit kanal \u00ebsht\u00eb n\u00eb discretion t\u00eb operatorit.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">P\u00ebrmbajtja e seris\u00eb s\u00eb artikujve<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Pjesa 1: Arkitektura e p\u00ebrgjithshme e rrjetit KTV<\/a><\/noindex><\/li>\n<li>Pjesa 2: Struktur\u00eb dhe forma e sinjalit<\/li>\n<li>Pjesa 3: Komponenti analog i sinjalit<\/li>\n<li>Pjesa 4: Komponenti digjital i sinjalit<\/li>\n<li>Pjesa 5: Rrjeti koaksial shp\u00ebrndar\u00ebs<\/li>\n<li>Pjesa 6: Amplifikator\u00ebt e sinjalit RF<\/li>\n<li>Pjesa 7: Marr\u00ebsit optik\u00eb<\/li>\n<li>Pjesa 8: Rrjeti magistral optik<\/li>\n<li>Pjesa 9: Stacioni kryesor<\/li>\n<li>Pjesa 10: Gjetja dhe ndreqja e defekteve n\u00eb rrjetin KTV<\/li>\n<\/ul>\n<p>Dua t\u00eb theksoj se nuk jam duke shkruar nj\u00eb lib\u00ebr shkollor, por nj\u00eb p\u00ebrmbledhje p\u00ebr t\u00eb zgjeruar horizontin dhe p\u00ebr t'u futur n\u00eb bot\u00ebn e televizionit me kabllo. Prandaj, p\u00ebrpiqem t\u00eb shkruaj n\u00eb nj\u00eb gjuh\u00eb t\u00eb thjesht\u00eb, duke l\u00ebn\u00eb fjal\u00ebt ky\u00e7e p\u00ebr t\u00eb interesuarit dhe pa u thelluar n\u00eb p\u00ebrshkrimin e teknologjive q\u00eb jan\u00eb p\u00ebrshkruar mjaft her\u00eb pa mua.<\/p>\n<h1>Si e matim<\/h1>\n<p>\nP\u00ebr t\u00eb marr\u00eb informacion mbi sinjalin n\u00eb kabllon koaksiale, stafi yn\u00eb teknik p\u00ebrdor kryesisht instrumentin Deviser DS2400T.<br \/>\n<img decoding=\"async\" alt=\"Rrjetet e kabllove t\u00eb televizionit p\u00ebr m\u00eb t\u00eb vegjlit. Pjesa 2: Kompozimi dhe forma e sinjalit.\" src=\"\/wp-content\/uploads\/2019\/04\/16736bb28accd24fa63aba18629d83eb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00eb thelb, ky \u00ebsht\u00eb nj\u00eb marr\u00ebs televiziv, por n\u00eb vend t\u00eb imazhit dhe z\u00ebrit ne shohim karakteristika sasiore dhe cil\u00ebsore si t\u00eb gjith\u00eb spektrin, ashtu edhe kanalet e ve\u00e7anta. Ilustrimet e m\u00ebposhtme jan\u00eb screenshot-e nga ky instrument.<\/p>\n<p>Ky Deviser ka funksionalitet t\u00eb bollsh\u00ebm, megjithat\u00eb ka pajisje edhe m\u00eb t\u00eb avancuara: me ekran q\u00eb tregon direkt imazhin televiziv, marrjen e sinjalit optik dhe, \u00e7far\u00eb i mungon Deviser-it, marrjen e sinjalit satelitor DVB-S (por kjo \u00ebsht\u00eb nj\u00eb histori krejt tjet\u00ebr).<\/p>\n<h1>Spektri i sinjalit<\/h1>\n<p>\nModi i shfaqjes s\u00eb spektrit lejon nj\u00eb vler\u00ebsim t\u00eb shpejt\u00eb t\u00eb gjendjes s\u00eb sinjalit \"me sy\".<\/p>\n<p><img decoding=\"async\" alt=\"Rrjetet e kabllove t\u00eb televizionit p\u00ebr m\u00eb t\u00eb vegjlit. Pjesa 2: Kompozimi dhe forma e sinjalit.\" src=\"\/wp-content\/uploads\/2019\/04\/2b012db5798f40c20514290ed44d89e4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00eb k\u00ebt\u00eb mod, pajisja skanon kanalet sipas nj\u00eb plani t\u00eb caktuar frekuencash. P\u00ebr leht\u00ebsi, jan\u00eb hequr frekuencat q\u00eb nuk p\u00ebrdoren n\u00eb rrjetin ton\u00eb, k\u00ebshtu q\u00eb imazhi i marr\u00eb paraqet nj\u00eb penges\u00eb kanalesh.<\/p>\n<p><img decoding=\"async\" alt=\"Rrjetet e kabllove t\u00eb televizionit p\u00ebr m\u00eb t\u00eb vegjlit. Pjesa 2: Kompozimi dhe forma e sinjalit.\" src=\"\/wp-content\/uploads\/2019\/04\/f6817317f6d0918c03eedd7f5684023e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKanalet digjitale shfaqen me ngjyr\u00eb blu, nd\u00ebrsa ato analogjike me ngjyr\u00eb t\u00eb verdh\u00eb. Pjesa e gjelb\u00ebr e kanalit analogjik \u00ebsht\u00eb komponenti i tij audio.<\/p>\n<p>Ndryshimi n\u00eb nivelet e kanaleve t\u00eb ndryshme \u00ebsht\u00eb shum\u00eb i duksh\u00ebm: anomalia e ve\u00e7ant\u00eb varet nga konfigurimet e transponder\u00ebve n\u00eb stacionin kryesor, nd\u00ebrsa ndryshimi i p\u00ebrgjithsh\u00ebm midis frekuencave m\u00eb t\u00eb larta dhe m\u00eb t\u00eb ul\u00ebta ka nj\u00eb kuptim t\u00eb caktuar, p\u00ebr t\u00eb cilin do t\u00eb flas m\u00eb posht\u00eb.<\/p>\n<p>N\u00eb k\u00ebt\u00eb mod, do t\u00eb vihen re qart\u00eb devijime t\u00eb m\u00ebdha nga norma, dhe n\u00ebse ka probleme serioze n\u00eb rrjet, kjo do t\u00eb jet\u00eb e dukshme menj\u00ebher\u00eb. P\u00ebr shembull, n\u00eb imazhin e dh\u00ebn\u00eb shihen dy kanale numerike q\u00eb mungojn\u00eb n\u00eb zon\u00ebn e frekuencave t\u00eb larta: ato jan\u00eb t\u00eb pranishme vet\u00ebm n\u00eb form\u00ebn e shiritave t\u00eb shkurt\u00ebr, q\u00eb sapo arrijn\u00eb nivelin 10 dBmV (n\u00eb krye \u00ebsht\u00eb caktuar niveli referues 80 dBmV \u2014 kjo \u00ebsht\u00eb kufiri i sip\u00ebrm i grafikut), i cili n\u00eb fakt \u00ebsht\u00eb zhurm\u00eb q\u00eb kablli e merr si anten\u00eb ose q\u00eb shkaktohet nga pajisjet aktive. K\u00ebto dy kanale jan\u00eb teste dhe ishin t\u00eb fikura n\u00eb momentin e shkrimit t\u00eb artikullit.<\/p>\n<p>Mund\u00ebsia e keqkuptimit mund t\u00eb vij\u00eb nga diskrimi i vendosjes s\u00eb kanaleve digjitale dhe analoge. Kjo natyrisht nuk \u00ebsht\u00eb e sakt\u00eb dhe ndodhi p\u00ebr shkak t\u00eb zhvillimit evolutiv t\u00eb rrjetit: n\u00eb planin e frekuenc\u00ebs thjesht jan\u00eb shtuar kanale t\u00eb tjera n\u00eb pjes\u00ebt e lira t\u00eb spektrit. Kurdoher\u00eb q\u00eb do t\u00eb krijohej nj\u00eb plan frekuencash nga fillimi, do t\u00eb ishte e drejt\u00eb t\u00eb vendosej e gjith\u00eb analoga n\u00eb pjes\u00ebn e poshtme t\u00eb spektrit. P\u00ebr m\u00eb tep\u00ebr, pajisjet stacionare t\u00eb destinuara p\u00ebr formimin e sinjalit p\u00ebr vendet evropiane kan\u00eb kufizime p\u00ebr p\u00ebrdorimin e frekuencave p\u00ebr transmetimin e sinjalit digjital dhe, megjith\u00ebse n\u00eb vendin ton\u00eb nuk ka k\u00ebso kufizimesh, p\u00ebrdorimi i nj\u00eb pajisjeje t\u00eb till\u00eb k\u00ebrkon vendosjen e kanaleve digjitale n\u00eb spektrin p\u00ebrkund\u00ebr logjik\u00ebs.<\/p>\n<h1>Forma e sinjalit<\/h1>\n<p>\nSi e dim\u00eb nga fizika themelore, sa m\u00eb e lart\u00eb t\u00eb jet\u00eb frekuenca e val\u00ebs, aq m\u00eb e madhe \u00ebsht\u00eb zbehja e saj nd\u00ebrsa p\u00ebrhapet. Kur d\u00ebrgoni nj\u00eb sinjal t\u00eb gjer\u00eb si ai n\u00eb rrjetin KTV, zbehja n\u00eb rrjetin shp\u00ebrndar\u00ebs mund t\u00eb arrij\u00eb disa dhjet\u00ebra decibel\u00eb n\u00eb segment, nd\u00ebrsa n\u00eb pjes\u00ebn e poshtme t\u00eb spektrit do t\u00eb jet\u00eb disa her\u00eb m\u00eb e vog\u00ebl. Prandaj, duke d\u00ebrguar nj\u00eb sinjal t\u00eb rregullt nga bodrumi n\u00eb katin e 25-t\u00eb, ne do t\u00eb shohim p\u00ebraf\u00ebrsisht si m\u00eb posht\u00eb:<\/p>\n<p><img decoding=\"async\" alt=\"Rrjetet e kabllove t\u00eb televizionit p\u00ebr m\u00eb t\u00eb vegjlit. Pjesa 2: Kompozimi dhe forma e sinjalit.\" src=\"\/wp-content\/uploads\/2019\/04\/df8b02e3904023bb254de8f1dd9d7d3c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNiveli i frekuencave t\u00eb larta \u00ebsht\u00eb duksh\u00ebm m\u00eb i ul\u00ebt se ai i frekuencave t\u00eb ul\u00ebta. N\u00eb nj\u00eb situat\u00eb t\u00eb v\u00ebrtet\u00eb, televizori, pa e analizuar, mund ta konsideroj\u00eb kanalet m\u00eb t\u00eb dob\u00ebta thjesht si zhurm\u00eb dhe t'i filtroj\u00eb ato. Dhe n\u00ebse n\u00eb apartament \u00ebsht\u00eb instaluar nj\u00eb amplifikator, p\u00ebrpjekja p\u00ebr ta rregulluar at\u00eb p\u00ebr nj\u00eb marrje cil\u00ebsore t\u00eb kanaleve nga pjesa e ep\u00ebrme e diapazonit do t\u00eb shkaktoj\u00eb nj\u00eb tejshkakim n\u00eb at\u00eb t\u00eb poshtme. Standardet rregullojn\u00eb nj\u00eb diferenc\u00eb jo m\u00eb shum\u00eb se 15 dBmV n\u00eb t\u00ebr\u00eb diapazonin.<\/p>\n<p>P\u00ebr t\u00eb shmangur k\u00ebt\u00eb, gjat\u00eb konfigurimit t\u00eb pajisjeve aktive, fillimisht vendoset nj\u00eb nivel m\u00eb i lart\u00eb n\u00eb zon\u00ebn e frekuencave t\u00eb larta. Kjo quhet \"k\u00ebndi direkt\", ose thjesht \"k\u00ebndi\". Ajo q\u00eb tregohet n\u00eb imazh \u00ebsht\u00eb \"k\u00ebndi i kund\u00ebrt\", dhe ky \u00ebsht\u00eb nj\u00eb tregues i nj\u00eb avarie. Ose, s\u00eb paku, nj\u00eb shenj\u00eb se di\u00e7ka \u00ebsht\u00eb e gabuar me kabllon deri n\u00eb pik\u00ebn e matjes. <\/p>\n<p>Ka dhe situata t\u00eb kund\u00ebrt, kur frekuencat e ul\u00ebta jan\u00eb praktikisht t\u00eb mungojn\u00eb, nd\u00ebrsa ato t\u00eb larta d\u00ebshtojn\u00eb t\u00eb mb\u00ebrrijn\u00eb mbi nivelin e zhurmave:<\/p>\n<p><img decoding=\"async\" alt=\"Rrjetet e kabllove t\u00eb televizionit p\u00ebr m\u00eb t\u00eb vegjlit. Pjesa 2: Kompozimi dhe forma e sinjalit.\" src=\"\/wp-content\/uploads\/2019\/04\/a69fd310c5115b09f4cdf6d209e04fef.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKjo gjithashtu na tregon p\u00ebr d\u00ebmtimin e kabllos, ve\u00e7an\u00ebrisht t\u00eb gjilp\u00ebr\u00ebs qendrore: sa m\u00eb e lart\u00eb t\u00eb jet\u00eb frekuenca, aq m\u00eb af\u00ebr skajit t\u00eb valvodit ajo p\u00ebrhapet (efekti skin n\u00eb kabllon koaksiale). Prandaj, ne shohim vet\u00ebm ata kanale q\u00eb p\u00ebrhapen n\u00eb frekuencat e larta, por, si rregull, televizori nuk do t\u00eb mund t'i pranoj\u00eb ato me nj\u00eb nivel t\u00eb till\u00eb.<br \/>\n<br \/>Burimi: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" 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