Njengengxenye ebalulekile yokuxhumana okungenantambo, umsebenzi oyisisekelo we-antenna ukukhanyisa nokwamukela amaza omsakazo.Umsebenzi ukuguqula igagasi kazibuthe kagesi lisuke esiteshini sikamabonakude libe yivoltheji yesignali iye kufrikhwensi ephezulu .
Indlela i-antenna ye-TV esebenza ngayo iwukuthi lapho igagasi kazibuthe liya phambili, lishaya uthi lwensimbi, linqamule umugqa wendawo kazibuthe, futhi lidale amandla e-electromotive, okuyi-voltage yesiginali.
Njengengxenye ebalulekile yesistimu yokuxhumana, ukusebenza kwe-antenna kuthinta ngokuqondile inkomba yesistimu yokuxhumana.Umsebenzisi kufanele anake ukusebenza kwawo kuqala lapho ekhetha uthi.
Esinye sezinkomba eziyinhloko ze-antenna inzuzo, okuwumkhiqizo we-coefficient eqondisayo nokusebenza kahle, futhi ukubonakaliswa kobukhulu bemisebe ye-antenna noma amagagasi atholiwe.Ukukhethwa kosayizi wokuzuza kuncike ezidingweni idizayini yesistimu yendawo yokumboza igagasi lomsakazo.Kalula nje, ngaphansi kwezimo ezifanayo, lapho inzuzo iphezulu, ibanga lokusabalala kwegagasi lomsakazo liba kude.Ngokuvamile, i-antenna yesiteshi esiyisisekelo ithatha i-antenna yenzuzo ephezulu, futhi i-antenna yesiteshi samaselula ithatha i-antenna yenzuzo ephansi.
I-TV ethola i-antenna ngokuvamile iwumugqa (i-satellite ethola i-antenna i-antenna engaphezulu), ngokuya ngebanga lemvamisa yesignali yefrikhwensi ephezulu ingahlukaniswa ngothi lwe-VHF, uthi lwe-UHF kanye ne-antenna yawo wonke amashaneli;Ngokobubanzi bebhendi yefrikhwensi ye-antenna eyamukelayo, ihlukaniswe yaba i-antenna eyodwa kanye ne-frequency antenna.Ngokwesakhiwo sayo, ingahlukaniswa ibe i-antenna engumhlahlandlela, i-antenna eyindandatho, i-fishbone antenna, i-antenna ye-log periodic njalonjalo.
Uhlelo lwe-TV yesifunda esivulekile olwamukelwe isistimu ye-TV yekhebula ngokuyinhloko luhlanganisa amabhendi amabili okuvama: ⅵ (isiteshi 1-4) kanye ⅷ (isiteshi 6-12) kubhendi ye-VHF kanye ne-UIV(isiteshi 13-24) kanye ne-UV(isiteshi 25- 48) kubhendi ye-UHF.Kubhendi yefrikhwensi ye-VHF, i-antenna ekhethekile yesiteshi ethola isignali ye-TV yesiteshi esithile ngokuvamile iyakhethwa, futhi indawo yokwamukela engcono kakhulu ikhethwa ukuze ifakwe, ukuze ibe nezinzuzo zokuzuza okuphezulu, ukukhetha okuhle kanye nokuqondisa okuqinile.Kodwa-ke, i-partial-band antenna esetshenziswa kokuthi ⅵ naku-ⅷ kanye ne-antenna yawo wonke amashaneli asetshenziswa ku-VHF anebhendi yefrikhwensi ebanzi kanye nenzuzo ephansi, elungele kuphela amasistimu athile amancane.Kubhendi yefrikhwensi ye-UHF, ama-antenna amabhendi ngokuvamile angathola izinhlelo zikamabonakude zamashaneli ambalwa ahlukaniswe eduze.
Isikhathi sokuthumela: Aug-25-2022