Muchinyorwa chino tichatarisa kune yakakwira-frequency radio signal amplifiers yetambo terevhizheni pane coaxial chikamu chemutsara.
Zviri mukati mechikamu chechinyorwa
- Chikamu 6: RF Amplifiers
- Chikamu 7: Optical Receivers
- Chikamu 8: Optical backbone network
- Chikamu 9: Musoro
- Chikamu 10: Troubleshooting pamusoro tambo TV network
Kana pane imwe chete yekuona inogamuchira mumba (kana kunyangwe mubhuroko rese) uye ese waya kune anosimuka akagadzirwa necoaxial tambo, chiratidzo chekusimudzira chinodiwa pakutanga kwavo. Mune network yedu, isu tinonyanya kushandisa zvishandiso kubva kuTeleste, saka ini ndichakuudza uchishandisa muenzaniso wavo, asi zvakanyanya, midziyo kubva kune vamwe vanogadzira haina kusiyana uye seti yekushanda kwekugadzirisa inowanzofanana.
Iyo CXE180M modhi ine huwandu hushoma hwezvirongwa:
Sezvaungangorangarira kubva kuzvikamu zvakapfuura, chiratidzo chine maviri akakosha ehuwandu paramita: nhanho uye mutsetse. Ndivo vanogona kubatsira kugadzirisa amplifier marongero. Ngatitangei mukurongeka: pakarepo mushure mekubatanidza kwekubatanidza kune attenuator. Inokutendera kuti uderedze chiratidzo chekuisa kusvika pa31 dB (kana iyo yebhuruu jumper inochinjika zvinoenderana nedhayagiramu, iyo knob range inoshanduka kubva 0-15 kusvika 16-31 dB). Izvi zvinogona kudikanwa kana amplifier ikagamuchira chiratidzo chinodarika 70 dBΒ΅V. Icho chokwadi ndechekuti iyo amplifier nhanho inopa kuwedzera kweyero yechiratidzo ne40 dB, uye pakubuda hatifanire kubvisa isingapfuure 110 dBΒ΅V (pamwero wepamusoro chiratidzo-ku-ruzha chiyero chinodonha zvakanyanya uye nhamba iyi yakakodzera ese Broadband amplifiers uye anogashira ane akavakirwa-mukati amplifier). Saka, kana 80 dBΒ΅V ikasvika pakuiswa kweamplifier, semuenzaniso, ipapo pakubuda ichatipa 120 dBΒ΅V yeruzha uye nhamba dzakapararira. Kuti udzivise izvi, iwe unofanirwa kuseta iyo yekuisa attenuator kune iyo 10 dB yekunyorovesa chinzvimbo.
Kuseri kweanorerutsa tinoona equalizer. Izvo zvinodikanwa kubvisa reverse tilt, kana iripo. Izvi zvinowanikwa nekudzikisira chiyero chechiratidzo munzvimbo yakaderera frequency neanosvika makumi maviri dB. Zvinokosha kucherechedza kuti hatizokwanisi kubvisa reverse mutserendende nekusimudza mwero wepamusoro frequencies, kungodzvinyirira iwo epasi.
Aya maturusi maviri anowanzo kukwana kugadzirisa masaini madiki ekutsauka kubva pane zvakajairwa. Kana zvisina kudaro, iwe unogona kushandisa zvinotevera:
Cable simulator, yakagadzirwa nenzira yekuisa iyo inogona kuiswa yakatwasuka kana yakatwasuka, sezvinoreva zita, inofananidzira kuiswa kwechikamu chakareba chetambo, pane iyo attenuation yezvizhinji zvepamusoro mafrequency emhando inofanirwa kuitika. Izvi zvinokutendera kuti udzikise yakananga kutsetseka kana zvichidikanwa, kudzvanya 8 dB munzvimbo yakakwirira frequency zone. Izvi zvinogona kubatsira kana uchiisa amplifiers mu cascade pamusoro pechinhambwe chipfupi, semuenzaniso.
Mushure meizvi manipulations, chiratidzo chinopfuura nepakati pekutanga nhanho yeamplifier, mushure mezvo tinoona imwe yekuisa, iyo inotibvumira kuwedzera kudzikisa kuwana. Iyo jumper ichiitevera ichatibatsira zvakare kudzvanya ma frequency akaderera kuti tiwane kutsetseka kunodiwa. Aya magadzirirwo maviri akanyanya kufanana neyekupinza attenuator uye yakaenzana, asi kushanda nechikamu chechipiri checascade.
Pakubuda kweiyo amplifier stage tinoona test tap. Iyi ndiyo yakajairwa tambo yekubatanidza iyo yaunogona kubatanidza yekuyeresa kana terevhizheni inogamuchira kuti utarise kunaka kweiyo inobuda chiratidzo. Haasi ese maturusi uye anenge asina maTV anokwanisa kunyatso gadzira siginecha ine nhanho yezana kana anopfuura dBΒ΅V, saka bvunzo inotungamira pane chero michina inogara ichigadzirwa neattenuation ye20-30 dB kubva kune chaiyo yekubuda kukosha. Izvi zvinofanirwa kugara zvichichengetwa mupfungwa kana uchitora zviyero.
Imwe yekuisa inoiswa isati yabuda. Mufananidzo weamplifier unoratidza kuti museve unoratidzwa pairi unongonongedza kune chaiyo terminal. Uye izvi zvinoreva kuti hapazovi nechiratidzo kuruboshwe. Kuiswa kwakadaro kunosanganisirwa mune aya amplifiers "kunze kwebhokisi", uye mukati mebhokisi pachayo mune imwe inosanganisirwa mune yekuendesa seti:
Iyo inokutendera kuti ushandise yechipiri kuburitsa, asi zvisingaite inosuma chiratidzo chekumisikidza ye4 dB.
Pakutanga kutarisa, iyo amplifier modhi CXE180RF ine zvakapetwa kaviri marongero:
Muchokwadi, zvinhu zvese hazvisi kutyisa: kunze kwekusiyana kudiki, zvese pano zvakangofanana nezvakataurwa pamusoro apa.
Chekutanga, tepi yekuyedza yakaonekwa pane yekuisa. Inodiwa kudzora siginecha pasina kudzima tambo kubva pakuisa amplifier uye, maererano, pasina kukanganisa kutepfenyura.
Chechipiri, mafirita matsva ediplex, pamwe neattenuator uye equator, anodiwa pakumisikidza nzira dzekutumira dzeDOCSIS, saka nezvinangwa zvechinyorwa chino ndichangoti mafirita anocheka iwo ma frequency anoratidzwa paari uye izvi zvinogona. iva dambudziko kana muchiratidzo cheTV chiteshi chakatepfenyurwa pane aya ma frequency. Neraki, mugadziri anozvigadzira nemhando dzakasiyana uye kuzvitsiva kana zvichidikanwa hazvina kuoma.
Iwo mapfundo (pamwe chete nejumper, iyo inosuma attenuation ye10 dB) inokanganisa chete nzira yekudzoka uye haigone kushandura chiratidzo cheterevhizheni.
Asi vasara vatatu vanosvetuka vanotipa kuti tizive tekinoroji yakadai se kure simba.
Paunenge uchigadzira dzimba, amplifiers anowanzoiswa munzvimbo dzingave nezvinetso nekupa kwemagetsi kubva kumabhodhi ekugovera. Mukuwedzera, imwe neimwe plug-socket pair, iyo inosanganisirawo mutsikidzi wedunhu (iyo inogona kuiswa munzvimbo isingatarisirwi zvakanyanya), inomiririra nzvimbo inogona kukanganisa. Panyaya iyi, zvinogoneka kuisa magetsi emagetsi zvakananga kuburikidza necoaxial tambo. Uyezve, sezvazvinoonekwa kubva pamakadhi pandiro yekugovera magetsi, inogona kunge ichichinjika kana yakananga ikozvino ine yakakura kwazvo voltage renji. Saka: aya matatu anosvetuka anogonesa mukana wekugovera ikozvino kuyerera kune yekuisa, pamwe nechero yega yeayo maviri anobuda zvakasiyana, kana isu tichida simba rinotevera amplifier mune cascade. Kana iyo riser ine vanyoreri yakavhurwa, voltage haigone kupihwa kune inobuda, hongu!
Ndakatotaura mukati zvikamu izvo mune yakadaro masisitimu akakosha matepi anoshandiswa:
Vanoshandisa zvinhu zvakakura uye zvakavimbika, uye muviri wakakura unopa kupisa uye kudzivirira.
Simba rinobva mune iyi kesi ibhuroka ine yakavakirwa-mukati yakakura transformer:
Zvakakodzera kuti titaure kuti kunyangwe ichiita senge yakakwana yechirongwa chekupa magetsi kure, maamplifiers anoshanda nenzira iyi haadiki kurarama nekutadza kwemagetsi kumba pasina mhedzisiro, uye kana vachivatsiva, vashandi vehunyanzvi vanofanirwa kutsvaga nekudzima magetsi. simba kune iyo unit pachayo, kuitira kuti usashande netambo mhenyu uye, nekudaro, Kana imwe amplifier ikatsiviwa, imba yese inoramba isina chiratidzo. Nechikonzero chimwe chete, akadai amplifiers anoda tepi yekuyedza pane yekuisa: zvikasadaro waizofanira kushanda netambo mhenyu.
Zvingave zvinonakidza kuziva kubva kune vaunoshanda navo kuti akajairwa masisitimu ane kure magetsi magetsi, nyora mune zvakataurwa kana iwe uchizvishandisa, ndapota.
Kana iwe uchida kubatanidza nhamba huru yeTV mukati mefurati kana hofisi, unogona kusangana nekushayikwa kwemazinga mushure meketani yevanoparadzanisa. Muchiitiko ichi, zvinodikanwa kuisa amplifier panzvimbo yemunyoreri, iyo midziyo midiki ine huwandu hushoma hwezvirongwa uye yakaderera amplification level inoshandiswa.
Semuenzaniso, seizvi:
Source: www.habr.com