I-G1 Universal LNB
Incazelo Yomkhiqizo
I-G1 uchungechunge lwe-LNB yendawo yonke inokukhipha okukodwa noma okubili noma kwe-Quattro, imbobo ngayinye ye-RF inomphumela ongu-950~2150MHz enamandla angu-13V noma angu-18V ahlanekezela e-DC asuka kumamukeli wesathelayithi.
I-low-noise block downconverter (LNB) idivayisi eyamukelayo efakwe ezitsheni zesathelayithi, eqoqa amaza omsakazo esitsheni bese iwaguqulela kusignali ethunyelwa ngekhebula kumamukeli ongaphakathi kwesakhiwo. I-LNB ibizwa nangokuthi ibhulokhi yomsindo ophansi, isiguquli somsindo ophansi (LNC), noma ngisho nesiguquli somsindo ophansi (LND).
I-LNB iyinhlanganisela yeamplifier enomsindo ophansi, i-frequency mixer, i-oscillator yendawo kanye ne-intermediate frequency (IF) amplifier. Isebenza njengengxenye engaphambili ye-RF yesamukeli sesathelayithi, ithola isignali ye-microwave kwisathelayithi eqoqwe yisitsha, iyikhulise, futhi yehlise ibhulokhi yamafrikhwensi ibe ibhulokhi ephansi yamafrikhwensi aphakathi nendawo (IF). Lokhu kuguqulwa kuvumela isignali ukuthi ihanjiswe kumamukeli we-TV yesathelayithi yasendlini kusetshenziswa intambo eshibhile ye-coaxial; uma isignali ihlala kufrikhwensi yayo yasekuqaleni ye-microwave izodinga ulayini we-waveguide obizayo nongasebenzi.
I-LNB ivamise ukuba yibhokisi elincane elilengiswa ku-boom eyodwa noma ngaphezulu amafushane, noma izingalo zokuphakelayo, ngaphambi kwesibonisi sesitsha, lapho igxila khona (nakuba ezinye imiklamo yesitsha ine-LNB phezu noma ngemuva kwesibonisi). Isignali ye-microwave esitsheni ithathwa yi-feedhorn ku-LNB futhi inikezwa engxenyeni ye-waveguide. Iphinikhodi yensimbi eyodwa noma ngaphezulu, noma ama-probe, aphumela ku-waveguide kuma-engeli angakwesokudla ku-eksisi futhi asebenze njengezimpondo, ephakela isignali ebhodini lesekethe eliphrintiwe ngaphakathi kwebhokisi elivikelwe le-LNB ukuze licutshungulwe. Isignali ephansi yefrikhwensi ye-IF iphuma kusokhethi ebhokisini lapho intambo ye-coaxial ixhumeka khona.
