Ukukhethwa kwe-antenna kumabonakude akuyona into elula njengoko kubonakala ngathi ekuqalekeni. Uhlobo lwe-antenna oluyidingayo luxhomekeke kwiimeko ezininzi. Le yindawo yokuhlala, kunye nobude ukusuka kwinqanaba leTV, kunye nokuphazamiseka, kunye nenani leziteshi ezifunwayo.
Kuza kubekho, kukho iintlobo ezintathu eziphambili ze-antennas: i-satellite, ngaphandle ne-antenna zangaphakathi kwi-TV. Inqaku lethu la namhlanje liya kukuxelela malunga nendlela yokukhetha i-antenna yeTV. Masifunde ukuba yintoni le sixhobo, kwaye yiyiphi imibala enokuqwalaselwa xa uyithenga.
Igumbi leThelevishini yeAntenna
Olu hlobo lwe-antenna lufanelekile kuphela kulabo basebenzi abahlala kummandla wesignali esilinganiselweyo. Ngamanye amazwi, abemi beendawo ezikude kunye nokwamkeleka okungekho mqondiso we-antenna yangaphakathi yangaphakathi (kunye ne-amplifier) ayinako.
Phakathi kweenzuzo ze-antennas zangaphakathi:
- ukulungelelaniswa - injalo i-antenna ayithathi indawo enkulu kwihostela yakho;
- ukuhamba - kungatshintshwa kalula ukusuka kwigumbi ukuya kwelinye igumbi, kuxhunyelelwe kwenye i-TV, ihanjiswe kwenye indawo okanye i-dacha;
- Iindleko eziphantsi - ngokuthelekisa ne-satellite kunye ne-outertenten antenna, le yunithi ungayithenga ngexabiso eliphantsi.
Iintsilelo eziphambili ze-antennas zangaphakathi zeTV ezisebenzayo, okokuqala, ukusebenza kwazo okuphantsi, kwaye okwesibini, imfuno yokuhlala kwindawo engama-20 ukuya kwi-30 ukusuka kwi-telecentre esondeleyo, kwaye okwesithathu, ukulungiswa okufanelekileyo komqathango. Gcina ukhumbule ukuba ukufumana kufuphi kwinqaba ayilona khetho olufanelekileyo: kulo mzekelo, kuya kubakho ezinye iintlobo zengxolo, umzekelo, ukubonakalisa uphawu. Ukuze uzilahle, ufuna idivaysi, ukutshintsha kwe-amplifier (ibizwa ngokuba yi-atttenuator).
Iintlobo zama-antenna angaphakathi
Kukho ezimbini iindidi eziphambili ze-antenna zangaphakathi - i-pivot kunye nesakhelo.
- Iyokuqala zimbini zensimbi "i-antennae" zobude obude ukuya kutsho kumitha enye. "I-Antenna" i-antenna bend kwiindawo eziliqela-oku kuyimfuneko yokulungisa i-antenna. Ukuze ufumane "umfanekiso" omhle wesiteshi esinye, kufuneka uzame kanzima ukulungisa. Kodwa ngamanye amaxesha kwenzeka ukuba ukulungiswa okuthe tye kwesinye ishaneli seTV kumnika ukuhluleka kwindlela yokulungisa abanye. Ngako oko, ngaphambi kokusebenzisa i-antenna yangaphakathi, inkosi inokuthi ikhwele, iguqule kwindlela ethile.
- Umehluko phakathi kwesakhelo kunye neendonga ze-antennas zangaphakathi kukuba zisebenza kwimodi ye-decimeter (dmv). I-antenna ye-loop isakhelo sesinyithi ngendlela yevali evulekile. Olu luyilo olulula lufana neempawu ezifana neyona nto, ngoko ke akukho nto ichaphazelekayo ekukhethweni kohlobo lwe-antenna yangaphakathi. Apha ufanele ugxininise kwi-optimal ye-signal reception-meter okanye i-decimetre, kwaye oku, kuxhomekeke kwinani leziteshi zeTV ezikhetha ukuzijonga.
Kungekudala, uhlobo olutsha lwe-antenna lwangaphakathi luye lwaziwa kakhulu: ii-antenna zokungena kwi-log-periodic eyenzelwe i-decimeter ibanga. Kwakhona kuthiwa yi-broadband, kuba "banokubamba" inani elikhulu leziteshi eziqhelekileyo, enikela umfanekiso obulunga.
Ngoko, masifumane izigqibo. I-antenna yangaphakathi iyanengqiqo ukuthenga, ukuba uhlala kwisixeko (kungekho kwimvelaphi) kunye nesiganeko esiqhelekileyo samkelwa, umthamo osondeleyo weTV uhlala ngaphakathi kweekhilomitha ezingama-30 kwikhaya lakho, kwaye ufuna ukulungelelanisa umgangatho wesigqithiso kancane, ngaphandle kokuchitha imali eninzi kuyo.
Kwakhona unokwenza i-antenna ngezandla zakho kwizinto eziphuculweyo kunye nakwezinkuni zebhiya .