I-Antennas yamaTV iyaziwa cishe kusukela ekuqaleni komlando wethelevishini, ngoba ngaphandle kwe-antenna i- TV ayibambe isignali. Ngaphambilini, abantu basebenzisa amadivaysi angaphakathi noma angaphandle axhunywe efonini "ibhokisi". Lokhu ubuchwepheshe bokuthi babambe izimpawu ezisuka kumbhoshongo wethelevishini oseduzane ukhona namuhla. Ngesikhathi esifanayo, inani leziteshi likhawulelwe kakhulu, futhi izinga lomfanekiso livame ukushiya okuningi.
Ukuxazulula lezi zinkinga, ekugcineni abantu badala i-satellite satellite. Kulesi simo, akusekho analog, kodwa isignali yedijithali ayidluli ngombhoshongo we-TV, kodwa ngama satellites ahamba emoyeni wangaphandle. Lokhu kuye kwaba injabulo ebiza kakhulu, ayitholakali kuwo wonke umuntu.
Ukuqhubeka okuqhubekayo akuzange kumile, futhi isistimu yethelevishini eyinkimbinkimbi yenziwa - idijithali. Ihlanganisa izindlela eziningana zokudluliswa kwedatha:
- ngokusebenzisa umbhoshongo we-TV (komhlaba);
- ngokusebenzisa ikhebula (ikhebula le-digital digital);
- ngokusebenzisa i-satellite;
- ngokuxhuma kwi-Inthanethi ngokusebenzisa amadivayisi akhethekile (i-IP-TV).
Ngamunye wabo unikeza ukufinyelela kwamakhulu amashaneli we-TV angaphandle nakwamanye amazwe ngekhwalithi elihle kakhulu.
I-Satellite dish ye-TV
Uma ngaphambili, i-dish ye-satellite yayiyinto yokunethezeka futhi sasibukela ngomona "amapuleti" ezindlini zabantu abacebile, namuhla kwakukhona ukwehla okubonakalayo ezindlebeni zabo, ngenxa yalokho ithelevishini ye-satellite yafinyeleleka kakhulu.
Isitsha esihle se-satellite ukuze i-TV ithathe inombolo enkulu yeziteshi. Ikhwalithi yesignali ihle kakhulu. Ingancishiswa kuphela ngokuchithwa okwesikhashana ngesimo semvula noma iqhwa.
I-antenna ye-Digital ye-TV
Njengoba sekushiwo ngenhla, kunezinketho eziningana zethelevishini yedijithali , ngokulandelana, ngayinye yazo kukhona uhlobo lwe-antenna. Indlela yokukhetha i-antenna ye-TV, uma ukukhetha kukhulu kakhulu? Ungazihlukanisa ngemingcele eminingana. Ngakho, endaweni yokufakwa kungaba:
- antenna zasendlini;
- ama-antenna angaphandle.
Ikamelo, njengoba kucacisiwe kusuka egameni, ifakwe endlini endlini okuthiwa yizindawo zokumamukela eziphephile. Emadolobhaneni nasemizaneni yamaholidi ase-suburban, akufanelekile ukulinda izithombe ezinjalo eziphakeme kakhulu kusuka kuma-antenna anjalo. Ukuze uthuthukise ikhwalithi yesithombe, kungcono ukusebenzisa ama-antenna ekamelo nge-amplifier ye-TV.
Ama-antenna angaphandle angcono kakhulu kumingcele yawo futhi angasetshenziswa cishe yonke indawo. Kunzima kakhulu ukufaka i-antenna enjalo, futhi okunye okuhlangenwe nakho kuyadingeka, kodwa umphumela ufanele umzamo.
Ngohlobo lokukhuliswa kwesignali, i-antenna ihlukaniswe yaba:
- i-passive;
- esebenzayo.
Ama-antenna aphansi ayamukela futhi akhulise isignali ngenxa yesimo sabo sejometri. Ngesikhathi esifanayo, abanalo izici zokuvuselela okusebenzayo - azikho ama-transistors noma ama-microchips. Ngenxa yalokhu, ama-antenna anjalo angethuli noma yimuphi umsindo owengeziwe noma umsindo owenziwe kwisignali eyamukelwe, okuqhubekayo ihambisana nezinsimbi zomboni. Noma kunjalo, abakwazi ngaso sonke isikhathi ukuqinisekisa ukukhishwa kwekhwalithi eliphezulu ngenxa yamakhono abo okulinganiselwe.
Ama-antenna asebenzayo akhulisa isignali etholakele hhayi kuphela ngenxa yokuma kwawo, kodwa futhi ne-amplifier eyakhelwe ngaphakathi noma etholakale ngokwehlukana. Idla i-antenna enjalo emanzini. Kuwumthombo wokuphazanyiswa nomsindo kwezinye izimo: uma endaweni engenazo ukwamukelwa okuqinisekile, uma isikhulisi sikhulisa ngokweqile noma i-amplifier ikhiqizwa ngumenzi ongaziwa, okungukuthi, inekhwalithi embi.
Ngokusho kwama-frequencies atholakele, ama-antenna adijithali:
- isiteshi;
- i-banded;
- wonke-wave.
Amashaneli wesiteshi athola iziteshi zohlu oluhlukene kuphela futhi awasetshenziselwa ababukeli abajwayelekile, kodwa kunalokho ezimweni ezikhethekile.
Ama-antenna amathanga asetshenziswa ezimweni uma kudingeka ukuthi uthathe ama-MB kuphela (amagagasi wamitha) noma ama-DMW (amagagasi e-decimeter) kuphela. Ngakho-ke eRussia kuphela u-DMV-ububanzi obusetshenzisiwe, futhi i-antenna esebenza kulolu hlu ibanele ngokwanele.
Wonke ama-antenna ama-wave alamukela ngesikhathi esisodwa. Ngokuvamile, ababukeli be-TV bathenga ama-antenna anjalo, ngoba bafuna ukubamba iziteshi, basakazwa kuma-MV ne-DMV-bands.