{"id":34586,"date":"2019-10-31T21:59:12","date_gmt":"2019-10-31T18:59:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-6-usiliteli-rf-signala\/"},"modified":"2019-10-31T21:59:12","modified_gmt":"2019-10-31T18:59:12","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-6-usiliteli-rf-signala","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-6-usiliteli-rf-signala","title":{"rendered":"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/36bcd73dffd731737aa78687864b4475.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSelles artiklis k\u00e4sitleme koaksiaalkaabli k\u00f5rgsagedusliku raadi signaali v\u00f5imendeid.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Artiklite seeria sisu<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Osa 1: Kaabli-TV v\u00f5rgu \u00fcldine arhitektuur<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Osa 2: Signaali koostis ja vorm<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Osa 3: Signaali analoogne komponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Osa 4: Signaali digitaalne komponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Osa 5: Koaksiaalne jaotamisv\u00f5rk<\/a><\/noindex><\/li>\n<li>Osa 6: RF-signaali v\u00f5imendid<\/li>\n<li>Osa 7: Optilised vastuv\u00f5tjad<\/li>\n<li>Osa 8: Optiline peav\u00f5rk<\/li>\n<li>Osa 9: Peajaam<\/li>\n<li>Osa 10: Veaotsing ja t\u00f5rgete k\u00f5rvaldamine kaabli-TV v\u00f5rgus<\/li>\n<\/ul>\n<p>\nKui majas (v\u00f5i isegi kogu kvartalis) on ainult \u00fcks optiline vastuv\u00f5tja ja kogu jaotus kuni riserite juurde on tehtud koaksiaalkaabliga, on signaali tugevdamine selle alguses h\u00e4davajalik. Meie v\u00f5rgus kasutatakse enamasti Teleste seadmeid, seega r\u00e4\u00e4gin nende n\u00e4itel, kuid p\u00f5him\u00f5tteliselt ei erine teiste tootjate seadmed millegi poolest ja seadistamise funktsioonide komplekt on \u00fcldjuhul sarnane.<\/p>\n<p>CXE180M mudelil on minimaalne seadistuste arv:<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/7bb8b53563084681625326a0bff20e70.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNagu te t\u00f5en\u00e4oliselt eelmistest osadest m\u00e4letate, on signaalil kaks olulist kvantiatiivset parameetrit: taseme ja kalde. Just neid saavad v\u00f5imendi seadistused korrigeerida. Alustame j\u00e4rjekorras: kohe p\u00e4rast sisend\u00fchendust asub <b>atenuator<\/b>. See v\u00f5imaldab v\u00e4hendada sissetulevat signaali kuni 31 dB (sinise \u017eamperi \u00fcmberl\u00fclitamisel vastavalt skeemile muudetakse reguleerimise ulatust 0-15 dB-lt 16-31 dB-le). See v\u00f5ib olla vajalik juhul, kui v\u00f5imendisse siseneb signaal, mis \u00fcletab 70 dB\u03bcV. Asi on selles, et v\u00f5imendi etapp t\u00f5stab signaali taset 40 dB v\u00f5rra ja v\u00e4ljundis ei tohi v\u00f5tta enam kui 110 dB\u03bcV (kui tase on liiga k\u00f5rge, langeb kordus suhe ja see n\u00e4itaja on k\u00f5igi lairiba v\u00f5imendite ja integreeritud v\u00f5imendiga vastuv\u00f5tjate jaoks aktuaalne). Seega, kui v\u00f5imendi sisendisse siseneb 80 dB\u03bcV, annaks see v\u00e4ljundis meile 120 dB\u03bcV m\u00fcra ja lagunevat signaali. Selle v\u00e4ltimiseks tuleb sisendi atenuator seada vaigistamisre\u017eiimisse 10 dB.<\/p>\n<p>Atenuaatori taga n\u00e4eme <b>ekvalaiserit<\/b>. See on vajalik tagasikaldumise k\u00f5rvaldamiseks, kui see esineb. Seda saavutatakse madalsagedusliku signaali taseme v\u00e4hendamise abil kuni 20 dB. Tuleb t\u00e4hele panna, et tagasikaldust ei saa k\u00f5rvaldada, suurendades k\u00f5rgsageduste taset, ainult madalsagedusi summutades.<\/p>\n<p>Need kaks t\u00f6\u00f6riista v\u00f5ivad olla piisavad, et parandada v\u00e4ikseid signaali k\u00f5rvalekaldeid normist. Kui see nii pole, v\u00f5ib kasutada j\u00e4rgmisi:<\/p>\n<p><b>Kaabli simulaator<\/b>, mille saab paigaldada horisontaalselt v\u00f5i vertikaalselt, simuleerib pika kaablil\u00f5igu sissel\u00fclitamist, kus peaks aset leidma peamiselt k\u00f5rgsageduste summutamine. See v\u00f5imaldab vajadusel v\u00e4hendada otsekallet, summutades 8 dB k\u00f5rgesageduslikes piirkondades. See on kasulik l\u00fchi\u00fclitiste v\u00f5imendite kaskade paigaldamisel, n\u00e4iteks.<\/p>\n<p>P\u00e4rast neid toiminguid l\u00e4bib signaal v\u00f5imendi esimese etapi, mille j\u00e4rel n\u00e4eme veel \u00fchte siset\u00fckki, mis v\u00f5imaldab t\u00e4iendavalt v\u00e4hendada v\u00f5imenduse koefitsienti. J\u00e4rgmine \u017eamper aitab meil j\u00e4lle madalsagedusi summutada, et saavutada vajalik kalle. Need kaks seadistust on olemuselt sarnased sisendi atenuatori ja ekvalaiseri funktsioonidega, kuid need t\u00f6\u00f6tavad teise etapi kaskaadiga.<\/p>\n<p>V\u00f5imendi kaskaadi v\u00e4ljundil n\u00e4eme <b>testiv\u00e4ljundit<\/b>. See on standardne keermestatud \u00fchendus, kuhu saab \u00fchendada m\u00f5\u00f5teseadmest v\u00f5i telekast kvaliteedi kontrollimiseks v\u00e4ljundsignaali. Mitte k\u00f5ik seadmed ja praktiliselt ei k\u00f5ik televisioonid ei suuda normaalselt vastu v\u00f5tta signaali, mille tase on sada v\u00f5i enam dB\u03bcV, seet\u00f5ttu on igasuguste seadmete testimiseks alati vajalik, et v\u00e4ljundis oleks 20-30 dB kaotust tegelikust v\u00e4\u00e4rtusest. Seda tuleb alati m\u00f5\u00f5tmiste tegemisel meeles pidada.<\/p>\n<p>V\u00e4ljundi ees on veel \u00fcks siset\u00fckk. V\u00f5imendi pildil on n\u00e4ha, et sellel olev nool osutab ainult paremale v\u00e4ljundile. See t\u00e4hendab, et vasakus v\u00e4ljundis signaali ei ole. Sellised siset\u00fckid on nende v\u00f5imendite sees \"karbist v\u00e4lja\", samas kui karbi sees on komplektis teisene:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/4981c7492e6304d7d1bbbdbc1cdc0720.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee v\u00f5imaldab kasutada teist v\u00e4ljundit, kuid toob paratamatult sisse 4 dB signaali summutamise.<\/p>\n<p>CXE180RF mudelil on esmapilgul kaks korda rohkem seadistusi:<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/31464579dfc395537a4f38fde05b7efd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTegelikult ei ole k\u00f5ik nii hirmus: v\u00e4lja arvatud m\u00f5ned v\u00e4ikesed erinevused on siin k\u00f5ik sama, mis \u00fclal kaalutud.<\/p>\n<p>Esiteks on sisendil testiv\u00e4ljund. See on vajalik signaali kontrollimiseks ilma kaabli eemaldamiseta v\u00f5imendi sisendist ja seega katkestamata edastust.<\/p>\n<p>Teiseks, ilmunud diplexfilterid, samuti attenuaator ja v\u00e4ljundi ekvalaiser on vajalikud DOCSIS-kanalite seadistamiseks, seega \u00fctlen selles artiklis vaid seda, et filtrid eemaldavad need sagedused, mis neil on m\u00e4rgitud, ja see v\u00f5ib muutuda probleemiks, kui signaalis nendel sagedustel edastatakse TV kanaleid. \u00d5nneks toote tarnija pakub neid erinevate v\u00e4\u00e4rtustega ja nende asendamine vajadusel ei valmista raskusi.<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/0a1001ad14d9c4ddb09fe80b8cb2548f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRegulaatorid (nagu ka jumper, mis lisab 10dB liigse kadumise) m\u00f5jutavad ainult tagasikanalit ja ei suuda kuidagi muuta televisioonisignaali.<\/p>\n<p>J\u00e4\u00e4nud kolm jumperit tutvustavad meile sellist tehnoloogiat nagu <b>kaugtoide<\/b>.<\/p>\n<p>Majade projekteerimisel paigaldatakse sageli v\u00f5imendid kohtadesse, kus v\u00f5ib esineda probleeme elektri toomisega jaotuspaneelidest. Lisaks on iga \u201epistiku-h\u00fclssi\u201d paar, mis sisaldab ka automaatset kaitsel\u00fclitit (mis v\u00f5ib olla paigaldatud k\u00f5ige ootamatumatesse kohtadesse), potentsiaalne rikkepunkt. Sellega seoses on v\u00f5imalik toita seadmeid otse koaksiaalkaabli kaudu. Nagu n\u00e4ha toiteploki m\u00e4rgistuselt, v\u00f5ib see olla nii vahelduv kui ka alalisvool, v\u00e4ga laia pingete vahemikuga. Need kolm jumperit v\u00f5imaldavad toitevoolu sisenemist, samuti iga kahe v\u00e4ljundi kohta eraldi, kui soovime toita j\u00e4rgmise v\u00f5imendi kaskaadis. Kui abonnentidega risu sissel\u00fclitamisel, ei tohi pinget kindlasti v\u00e4ljundisse saata!<\/p>\n<p>Olen juba maininud <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">eelnevas<\/a><\/noindex> osades, et sellises s\u00fcsteemis kasutatakse spetsiaalseid peamosaiikide jaotureid:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/55ec9e0e4779d8e9f7a0e055e469ffda.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/ff4ea47c231ed19a57b6033992cb4029.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNendes kasutatakse suuremaid ja usaldusv\u00e4\u00e4rsemaid komponente, massiivne korpus tagab soojuse hajutamise ja kaitse.<\/p>\n<p>Toiteallikaks sellisel juhul on plokk koos sisseehitatud massiivse transformatoriga:<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/7df95edc73042c88fc3b7efbeb11159a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTuleb m\u00e4rkida, et kuigi kaugtoite skeem tundub optimaalne, taluvad sellisel viisil t\u00f6\u00f6tavad v\u00f5imendid harva elektrikatkestusi kodudes ilma tagaj\u00e4rgedeta, ja nende vahetamisel peab tehniline personal lisaks otsima ja v\u00e4lja l\u00fclitama toite enda plokist, et t\u00f6\u00f6tada pinget sisaldavate kaablitega, ning seega j\u00e4\u00e4b \u00fche v\u00f5imendi asendamise ajaks kogu maja ilma signaalita. Sama p\u00f5hjusel on sellistele v\u00f5imenditele oluline testv\u00e4ljund sisenemisel: muidu peaks t\u00f6\u00f6tama pinget sisaldava kaabliga.<\/p>\n<p>Oleks huvitav teada kolleegidelt, kui levinud on kaugtoite s\u00fcsteemid, palun kirjutage kommentaaridesse, kui kasutate.<\/p>\n<p>Kui on vajalik \u00fchendada suur hulk televiisoreid korteris v\u00f5i kontoris, v\u00f5ib tekkida olukord, kus p\u00e4rast jaotureid ei j\u00e4tku signaali taset. Sel juhul on vajalik paigaldada v\u00f5imendi abonendi territooriumile, milleks kasutatakse v\u00e4ikseid seadmeid minimaalsete seadistustega ja madalama v\u00f5imendustasemega. <br \/>\nN\u00e4iteks selline:<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud v\u00e4ikestele. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/a0cca80a889e1a54602fefdceaf09126.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450452\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0443\u0441\u0438\u043b\u0438\u0442\u0435\u043b\u0438 \u0432\u044b\u0441\u043e\u043a\u043e\u0447\u0430\u0441\u0442\u043e\u0442\u043d\u043e\u0433\u043e \u0440\u0430\u0434\u0438\u043e\u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u044f \u043d\u0430 \u043a\u043e\u0430\u043a\u0441\u0438\u0430\u043b\u044c\u043d\u043e\u0439 \u0447\u0430\u0441\u0442\u0438 \u043c\u0430\u0433\u0438\u0441\u0442\u0440\u0430\u043b\u0438. \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 \u0444\u043e\u0440\u043c\u0430 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 3: \u0410\u043d\u0430\u043b\u043e\u0433\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 4: \u0426\u0438\u0444\u0440\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 5: \u041a\u043e\u0430\u043a\u0441\u0438\u0430\u043b\u044c\u043d\u0430\u044f \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u0441\u0435\u0442\u044c \u0427\u0430\u0441\u0442\u044c 6: \u0423\u0441\u0438\u043b\u0438\u0442\u0435\u043b\u0438 RF-\u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 7: \u041e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043f\u0440\u0438\u0451\u043c\u043d\u0438\u043a\u0438 \u0427\u0430\u0441\u0442\u044c 8: \u041e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043c\u0430\u0433\u0438\u0441\u0442\u0440\u0430\u043b\u044c\u043d\u0430\u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26062,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-34586","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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