Chiratidzo chinofambiswa pamusoro petambo terevhizheni network ndeye Broadband, frequency-yakakamurwa spectrum. Signal parameters, kusanganisira ma frequency uye manhamba echiteshi muRussia anodzorwa neGOST 7845-92 uye GOST R 52023-2003, asi mutyairi akasununguka kusarudza zvirimo mugwara rega rega nekufunga kwake.
Zviri mukati mechikamu chechinyorwa
- Chikamu 2: Kuumbwa uye waveform
- Chikamu 3: Analog chikamu chechiratidzo
- Chikamu 4: Digital chikamu chechiratidzo
- Chikamu 5: Coaxial Distribution Network
- Chikamu 6: RF Amplifiers
- Chikamu 7: Optical Receivers
- Chikamu 8: Optical backbone network
- Chikamu 9: Musoro
- Chikamu 10: Troubleshooting pamusoro tambo TV network
Rega ndikuyeuchidze kuti handisi kunyora bhuku, asi chirongwa chekudzidzisa kuwedzera maonero angu uye kupinda munyika yetambo TV. Nokudaro, ndinoedza kunyora mumutauro wakapfava, ndichisiya mazwi makuru kune avo vanofarira uye vasingapindi zvakadzika mutsanangudzo yetekinoroji yakanyatsorondedzerwa mazana enguva pasina ini.
Tinopima chii?
Nyanzvi dzedu dzinonyanya kushandisa iyo Deviser DS2400T kuwana ruzivo rwechiratidzo pane coaxial tambo.
Chaizvoizvo iyi inogamuchira terevhizheni, asi pachinzvimbo chemufananidzo uye ruzha, tinoona huwandu uye hwemhando hunhu hwesese spectrum uye chiteshi chega. Mienzaniso inotevera skrini kubva pachigadzirwa ichi.
Iyi Deviser inotove neakarebesa kushanda, asi kune kunyange inotonhorera michina: ine skrini inoratidza mufananidzo weTV zvakananga, inogamuchira chiratidzo chemaziso uye, chinoshaikwa neDeviser, kugamuchira DVB-S satellite chiratidzo (asi iyo inyaya yakasiyana zvachose) .
Signal spectrum
Iyo spectrum inoratidzira modhi inokubvumira kuti uongorore nekukurumidza mamiriro echiratidzo "neziso"
Mune iyi modhi, chishandiso chinotarisa machaneli zvinoenderana neyakatsanangurwa frequency chirongwa. Kuti zvive nyore, mafrequency asina kushandiswa munetiweki yedu akabviswa kubva kune yakazara spectrum, saka mhedzisiro mufananidzo ndeye palisade yemachaneli.
Digital chiteshi inoratidzwa mubhuruu, analogue nzira dziri yero. Chikamu chegirinhi cheanalog chiteshi ndicho chikamu chayo chekuteerera.
Musiyano wemazinga ematanho akasiyana unoonekwa zvakajeka: kusaenzana kwega kunoenderana nezvigadziro zvevashanduri pamusoro wepamusoro, uye musiyano mukuru pakati pepamusoro uye wakaderera frequencies ine imwe chirevo, chandichakurukura pazasi.
Mune iyi modhi, kutsauka kwakasimba kubva pane zvakajairwa kuchaonekwa zvakajeka, uye kana paine matambudziko akakomba mumambure, izvi zvinokurumidza kuoneka. Semuenzaniso, mumufananidzo uri pamusoro unogona kuona kusvetuka kwematanho maviri edhijitari munzvimbo yepamusoro-frequency zone: aripo chete muchimiro chemitsetse mipfupi, isingasviki pamwero we10 dBΒ΅V (iyo referensi nhanho ye80 dBΒ΅V inoratidzwa. kumusoro - uyu ndiwo muganho wepamusoro wegirafu), inova ruzha iyo tambo inogashira pachayo senge antenna kana yakapihwa neanoshanda midziyo. Aya maviri chiteshi inzira dzekuedza uye dzakadzimwa panguva yekunyora.
Iko kusaenzana kugovera kwedhijitari uye analog chiteshi kunogona kukonzera nyonganiso. Izvi, hongu, hazvina kunaka uye zvakaitika nekuda kwekuvandudzwa kwetiweki: mamwe machani aingowedzerwa kune frequency chirongwa mune yemahara chikamu che spectrum. Paunenge uchigadzira chirongwa chefrequency kubva pakatanga, zvingave zvakanaka kuisa analog yese pamucheto wezasi weiyo spectrum. Pamusoro pezvo, midziyo yechiteshi yakagadzirirwa kuburitsa chiratidzo chenyika dzeEurope ine zvirambidzo pakushandiswa kwemafafitera ekutepfenyura chiratidzo chedhijitari uye, kunyangwe pasina zvirambidzo zvakadaro munyika yedu, kushandisa michina yakadaro zvinodikanwa kuisa chiteshi chedhijitari mu spectrum. , zvinopesana nepfungwa.
Waveform
Sekuzivikanwa kwazvinoitwa kubva kune yakakosha fizikisi, kukwirisa kuwanda kwemafungu, ndiko kusimba kwekudzikisira kwayo painopararira. Kana uchitumira chiratidzo chebroadband chakadai sechinowanikwa mune network yeCATV, kudzikisira mune network yekugovera kunogona kusvika makumi ema decibel paruoko, uye muchikamu chepasi cheiyo spectrum ichave yakapetwa kakati wandei. Naizvozvo, tatumira chiratidzo chakatsiga kune inosimudza kubva pasi, pauriri hwemakumi maviri neshanu tichaona chimwe chinhu chakadai chinotevera:
Chiyero chepamusoro chepamusoro chinooneka chakaderera pane chepasi. Mumamiriro ezvinhu chaiwo, TV, isingainzwisisi, inogona kufunga zviteshi zvisina kusimba kungova ruzha uye kuzvisefa kunze. Uye kana amplifier yakaiswa mufurati, saka kana iwe uchiedza kuigadzira iyo yepamusoro-yemhando yekugashira machaneli kubva kumusoro kweiyo renji, yakawedzera-amplification ichaitika muchikamu chezasi. Miyero inotaura musiyano wekusapfuvura 15 dBΒ΅V pamusoro pehuwandu hwese.
Kuti udzivise izvi, kana uchigadzira midziyo inoshanda, nhanho yepamusoro inotangwa yakaiswa munzvimbo yakakwira frequency. Izvi zvinonzi "straight tilt", kana kungoti "tilt". Uye izvo zvinoratidzwa mumufananidzo ndezve "reverse tilt", uye mufananidzo wakadaro watova tsaona. Kana, zvishoma, chiratidzo chekuti pane dambudziko netambo kusvika pachiyero chekuyera.
Mamiriro ezvinhu akapesana anoitikawo, kana ma frequency akaderera asipo, uye epamusoro asingapindire pamusoro peyero yeruzha:
Izvi zvinotiudzawo nezve kukuvadzwa kwetambo, iyo yepakati musimboti: iyo yakakwira frequency, iyo padyo nemupendero wewaveguide iyo inoparadzira (ganda mhedzisiro mune coaxial tambo). Nokudaro, tinoona chete idzo nzira dzakagoverwa pamatunhu akakwirira, asi, sekutonga, TV haichakwanisi kuigamuchira pachiyero ichi.
Source: www.habr.com