I-G1 Universal LNB
Ingcaciso yeMveliso
Uthotho lwe-G1 lwendalo iphela lwe-LNB lunemveliso enye okanye iwele okanye i-Quattro, izibuko le-RF ngalinye lineziphumo ezingama-950~2150MHz ezine-13V okanye i-18V ebuyela umva amandla e-DC asuka kumamkeli wesathelayithi.
I-low-noise block downconverter (LNB) sisixhobo esifumanayo esixhonywe kwizitya zesathelayithi, eziqokelela amaza erediyo ukusuka esityeni kwaye ziwaguqulele kumqondiso othunyelwa ngentambo ukuya kumamkeli ngaphakathi kwesakhiwo. I-LNB ikwabizwa ngokuba yibhloko yengxolo ephantsi, isiguquli sengxolo ephantsi (LNC), okanye i-low-noise downconverter (LND).
I-LNB yindibaniselwano ye-low-noise amplifier, i-frequency mixer, i-oscillator yendawo kunye ne-intermediate frequency (IF) amplifier. Isebenza njenge-RF yangaphambili yesiphelo somamkeli wesathelayithi, ifumana isignali ye-microwave kwisathelayithi eqokelelwe sisitya, iyandise, kwaye iguqulela ibhloko yefrikhwensi ukuya kwibhloko esezantsi yamaza aphakathi (IF). Oku kuguqulwa kwezantsi kuvumela umqondiso ukuba uthwalwe kwisathelayithi yeTV engaphakathi kusetyenziswa intambo yecoaxial enexabiso eliphantsi; ukuba uphawu luhlala kumaxesha alo oqobo lwe-microwave luya kufuna umgca we-waveguide obizayo nongasebenziyo.
I-LNB idla ngokuba yibhokisi encinci exhonywe kwi-boom enye okanye ngaphezulu ezimfutshane, okanye iingalo zomxhesho, phambi kwesibonisi sesitya, ekugxininiseni kwayo (nangona uyilo lwesitya lune-LNB phezu okanye emva kwesibonisi). Umqondiso we-microwave ovela esityeni uthathwa yi-feedhorn kwi-LNB kwaye utyiswa kwicandelo le-waveguide. Izikhonkwane zentsimbi enye okanye ngaphezulu, okanye iiprobes, ziphumela kwi-waveguide kwii-engile ezichanekileyo kwi-axis kwaye zisebenze njengee-eriyali, ukondla umqondiso kwibhodi yesekethe eprintiweyo ngaphakathi kwebhokisi ekhuselekileyo ye-LNB ukuze iqhutywe. I-frequency esezantsi ye-IF isignali yokuphuma ivela kwi-socket kwibhokisi apho intambo ye-coaxial idibanisa.
