{"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":"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. Osa 6: RF-signaali v\u00f5imendid","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. 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 kaabeltelevisiooni k\u00f5rgsageduslike raadiosignaalide v\u00f5imendajaid koaksiaalses osas peajoonest.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Artiklisarja sisu<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Osa 1: \u00dcldine KTV v\u00f5rgu arhitektuur<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Osa 2: Signaali koostis ja kuju<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Osa 3: Analoogne signaalikomponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Osa 4: Digitaalne signaalikomponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Osa 5: Koaksiaalne jaotusv\u00f5rk<\/a><\/noindex><\/li>\n<li>Osa 6: RF-signaalide 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\u00f5rkeotsing KTV v\u00f5rgus<\/li>\n<\/ul>\n<p>\njuhul, kui hoones (v\u00f5i isegi tervenisti kvartalis) on vaid \u00fcks optiline vastuv\u00f5tja ja kogu jaotus kuni jaotustorudeni on teostatud koaksiaalkaabliga, on signaali v\u00f5imendamine selle alguses h\u00e4davajalik. Meie v\u00f5rgus kasutatakse peamiselt Teleste seadmeid, seega r\u00e4\u00e4gin nende n\u00e4itel, kuid p\u00f5him\u00f5tteliselt ei erine teiste tootjate seadmed asjadest ja seadistuste funktsionaalne kogum on tavaliselt sarnane.<\/p>\n<p>CXE180M mudelil on minimaalne seadistuste hulk:<br \/>\n<img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/7bb8b53563084681625326a0bff20e70.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKuidas te t\u00f5en\u00e4oliselt varasematest osadest m\u00e4letate, on signaalil kaks olulist kvantitatiivset parameetrit: see on taseme ja kalde. Just nende reguleerimisele v\u00f5ivad v\u00f5imendi seadistused aidata kaasa. Alustame j\u00e4rjekorras: kohe p\u00e4rast sisend\u00fchendust on <b>atenuator<\/b>. See v\u00f5imaldab v\u00e4hendada sisendsignaali kuni 31 dB-ni (kui sinine sildiga l\u00fcliti on seatud vastavalt skeemile, muutub reguleerimise vahemik 0-15 kuni 16-31 dB). Seda on vajalik teha juhul, kui v\u00f5imendisse sisenev signaal \u00fcletab 70 dB\u03bcV. Asja juurde kuulub, et v\u00f5imendi astmes t\u00f5stetakse signaali taset 40 dB v\u00f5rra, ning v\u00e4ljundis peame saama mitte rohkem kui 110 dB\u03bcV (kui tase t\u00f5useb liiga k\u00f5rgeks, langeb j\u00e4rsult signaali ja m\u00fcra suhe ning see number kehtib k\u00f5ikide lairibaliste v\u00f5imendite ja sisseehitatud v\u00f5imendiga vastuv\u00f5tjate kohta). Seega, kui 80 dB\u03bcV signaal j\u00f5uab v\u00f5imendi sisendisse, annab ta meile v\u00e4ljundiks 120 dB\u03bcV m\u00fcra ja segaste numbrite. Selle v\u00e4ltimiseks tuleb sisendatenuator seada 10 dB vaigistamise asendisse.<\/p>\n<p>Atenuatori taga n\u00e4eme <b>ekvalaiser<\/b>. See on vajalik, et k\u00f5rvaldada tagasikalded, kui neid esineb. Seda saavutatakse signaali taseme v\u00e4hendamise kaudu madalate sageduste piirkonnas kuni 20 dB. Tuleb t\u00e4hele panna, et tagasikallet ei saa k\u00f5rvaldada, t\u00f5stes k\u00f5rgemate sageduste taset, vaid tuleb alandada madalamat.<\/p>\n<p>Nendest kahest t\u00f6\u00f6riistast piisab sageli, et parandada signaali v\u00e4iksemaid k\u00f5rvalekaldeid normist. Kui see ei ole piisav, on j\u00e4rgmised t\u00f6\u00f6riistad kasutamiseks:<\/p>\n<p><b>Kaabli simulaator<\/b>, mille on tehtud lisana, mida saab paigaldada horisontaalselt v\u00f5i vertikaalselt, nagu nimi viitab, simuleerib pika kaabli l\u00f5igu sissel\u00fclitamist, kus peaks toimuma peamiselt k\u00f5rgema sageduse vahemiku kadumine. See v\u00f5imaldab vajadusel otse kalde v\u00e4hendamist, summutades 8dB k\u00f5rgete sageduste piirkonnas. See v\u00f5ib olla kasulik, kui paigutatakse v\u00f5imendajaid kas v\u00e4ljundpessa v\u00f5i l\u00fchikese vahemaa peale.<\/p>\n<p>P\u00e4rast neid manipulatsioone l\u00e4bib signaal esimest v\u00f5imenduskaskaadi etappi, mille j\u00e4rel n\u00e4eme veel \u00fchte lisandit, mis v\u00f5imaldab edasist suurendamise koefitsiendi v\u00e4hendamist. J\u00e4rgmine h\u00fcppaja aitab j\u00e4lle madalaid sagedusi summutada, et saada vajalikku kallakut. Need kaks seadistust on p\u00f5him\u00f5tteliselt v\u00f5rdv\u00e4\u00e4rsed sisendattenuatorile ja ekvalaiserile, kuid t\u00f6\u00f6tavad teise kaskaadi etapi juures.<\/p>\n<p>V\u00f5imenduskaskaadi v\u00e4ljundis n\u00e4eme <b>testv\u00e4ljav\u00f5ttu<\/b>. See on standardne keermestatud pistik, mille k\u00fclge saab \u00fchendada m\u00f5\u00f5teseadmestiku v\u00f5i vastuv\u00f5tja, et j\u00e4lgida v\u00e4ljundsignaali kvaliteeti. Mitte k\u00f5ik seadmed ja praktiliselt mitte \u00fckski televisioon ei suuda normaalselt vastu v\u00f5tta signaali, mille tase on sada ja rohkem dBmV, seet\u00f5ttu tehakse testitavad v\u00e4ljav\u00f5tted igas seadmes alati 20-30dB kadumisega tegelikest v\u00e4ljundv\u00e4\u00e4rtustest. Seda tuleb alati meeles pidada, tehes m\u00f5\u00f5tmisi.<\/p>\n<p>V\u00e4ljundi eel on veel \u00fcks lisand. V\u00f5imendi foto pealt on n\u00e4htav, et seal kujutatud nool osutab ainult paremale v\u00e4ljundile. Ja see t\u00e4hendab, et vasakul pole signaali. Sellised lisandid on nende v\u00f5imendite puhul \"karbis\" ning karbi sees on komplektselt olemas veel \u00fcks:<\/p>\n<p><img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. 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 kaasa signaali kadumise summas 4dB.<\/p>\n<p>Mudel CXE180RF v\u00f5imendil n\u00e4ib esmapilgul olevat kahekordne arv seadeid:<br \/>\n<img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. 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 hull: peale v\u00e4ikeste erinevuste on siin k\u00f5ik see sama, mis eespool arutatud.<\/p>\n<p>Esiteks on sisenemisel testv\u00e4ljund. See on vajalik signaali kontrollimiseks ilma kaabli katkestamiseta v\u00f5imendi sisenemiselt ja seega ilma edastamise katkestamiseta.<\/p>\n<p>Teiseks, ilmuvad diplexfiltid, samuti v\u00e4ljundi attenuator ja ekvalaiser on vajalikud DOCSIS-i kanalite seadistamiseks, seega \u00fctlen selles artiklis vaid, et filtrid l\u00f5ikavad v\u00e4lja need sagedused, mis neil on m\u00e4rgitud, ja see v\u00f5ib osutuda probleemiks, kui signaali spektris edastatakse TV-kanalid just nendel sagedustel. \u00d5nneks toodab tootja neid erinevate v\u00e4\u00e4rtustega ning nende vahetamine vajadusel ei ole keeruline.<br \/>\n<img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/0a1001ad14d9c4ddb09fe80b8cb2548f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNupud (nagu ka jumper, mis lisab 10 dB summutust) m\u00f5jutavad ainult tagasikanalit ja ei suuda kuidagi muuta televisioonisignaali.<\/p>\n<p>Kuid \u00fclej\u00e4\u00e4nud kolm jumperit pakuvad meile tutvuda sellise tehnoloogiaga nagu <b>kaudne toide<\/b>.<\/p>\n<p>Majade projekteerimisel paigaldatakse sageli v\u00f5imendid sellistesse kohtadesse, kus elektri\u00fchenduse loomisel v\u00f5ib esineda probleeme jootmisjaoturitelt. Lisaks sellele on iga paar \u00abpistiku-pesa\u00bb, mis eeldab automaatset kaitseklappi (mida v\u00f5ib paigaldada k\u00f5ige ootamatumasse kohta), potentsiaalne rikke koht. Seet\u00f5ttu on v\u00f5imalik toita seadet otse koaksiaalkaabli kaudu. Ja nagu on n\u00e4ha toiteploki sildilt, v\u00f5ib see olla nii vahelduv kui ka alalisvool, laiade pingevahemikega. Nii et need kolm jumperit v\u00f5imaldavad toitevoolu voolu sisenemist, samuti iga kahe v\u00e4ljundi eraldi, kui soovime toita j\u00e4rgmise v\u00f5imendi kaskaadi. Kui tellijatega riski v\u00e4ljal\u00fclitamine, ei tohi v\u00e4ljundile loomulikult pinget anda!<\/p>\n<p>Olen juba maininud <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">kontrolli. Sel ajal on C++ anal\u00fcsaatorisse lisatud kokku 66 \u00fcldotstarbelist diagnoosi.<\/a><\/noindex> osast, et sellises s\u00fcsteemis kasutatakse spetsiaalseid peamiseid jaotureid:<\/p>\n<p><img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. 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=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/ff4ea47c231ed19a57b6033992cb4029.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNeis kasutatakse suuremaid ja usaldusv\u00e4\u00e4rsemaid komponente, samas kui massiivne korpus tagab soojuse eemaldamise ja kaitse.<\/p>\n<p>Sellisel juhul on toiteallikaks plokk, millel on sisseehitatud massiivne trafo:<br \/>\n<img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. Osa 6: RF-signaali v\u00f5imendid\" src=\"\/wp-content\/uploads\/2019\/05\/7df95edc73042c88fc3b7efbeb11159a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTuleb mainida, et kuigi kaugtoite skeem n\u00e4ib olevat optimaalne, t\u00f6\u00f6tab sellisel viisil tugevdatud signaaliga amplifikaatorid harvemini ilma tagaj\u00e4rgedeta elektrit\u00f5rgete ajal majades, ja nende vahetamisel peab tehnik lisaks v\u00e4lja otsima ja v\u00e4lja l\u00fclitama ka seadme toite, et mitte t\u00f6\u00f6tada voolu all olevate kaablitega, ning seega j\u00e4\u00e4b \u00fche signaalita amplifikaatori asendamise ajaks terve maja ilma signaalita. Sama p\u00f5hjusel on sellistel amplifikaatoritel vaja testimisv\u00f5imalust sisendsignaalil: vastasel juhul tuleks t\u00f6\u00f6tada vooluga kaabli kallal.<\/p>\n<p>Oleks huvitav teada kolleegidelt, kui laialdaselt kasutatakse kaugtoite s\u00fcsteeme, palun kirjutage kommentaaridesse, kui kasutate.<\/p>\n<p>Kui on vaja \u00fchendada suur hulk televiisoreid korteris v\u00f5i kontoris, v\u00f5ib esineda puudus taseme osas p\u00e4rast jaotusseadmete ahelat. Sellisel juhul on vajalik paigaldada amplifikaator tellija territooriumile, milleks kasutatakse v\u00e4ikeseid seadmeid minimaalsete seadistustega ja madalama tugevusega. <br \/>\nN\u00e4iteks selline:<br \/>\n<img decoding=\"async\" alt=\"Kasutajatele m\u00f5eldud kaabeltelevisiooniv\u00f5rgud. 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 5.0.1.1 - 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