I-Yagi antenna, njenge-antenna eqondisayo yakudala, isetshenziswa kakhulu kumabhendi we-HF, VHF kanye ne-UHF.I-Yagi iyi-antenna evala isibhamu equkethe i-oscillator esebenzayo (imvamisa i-oscillator egoqiwe), isibonisi sokwenziwa kanye neziqondiso eziningi zokungenzi lutho ezihlelwe ngokuhambisana.
Kunezici eziningi ezithinta ukusebenza kwe-antenna ye-Yagi, futhi ukulungiswa kwe-antenna ye-Yagi kuyinkimbinkimbi kakhulu kunezinye izimpondo.Amapharamitha amabili we-antenna alungiswa kakhulu: imvamisa ye-resonant kanye nesilinganiso samagagasi okuma.Okusho ukuthi, imvamisa ye-resonant ye-antenna ilungiswa cishe ngo-435MHz, futhi isilinganiso segagasi sokuma se-antenna sisondele ku-1 ngangokunokwenzeka.
Setha uthi oluyi-1.5m ukusuka phansi, xhuma imitha yegagasi elimile bese uqala ukulinganisa.Ukuze kuncishiswe amaphutha okulinganisa, ikhebuli exhuma uthi kumitha yegagasi elimile kanye nomsakazo kumitha yegagasi elimile kufanele ibe mfushane ngangokunokwenzeka.Izindawo ezintathu zingalungiswa: umthamo we-trimmer capacitor, indawo yebha yesifunda esifushane kanye nobude be-oscillator esebenzayo.Izinyathelo ezithile zokulungisa zimi kanje:
(1) Lungisa ibha yesekethe emfushane 5 ~ 6cm kude ne-cross bar;
(2) Imvamisa yesidluliseli ilungiswa ibe ngu-435MHz, futhi i-capacitor ye-ceramic iyalungiswa ukuze kuncishiswe igagasi elimile lothi;
(3) Linganisa igagasi lokuma lothi ukusuka ku-430 ~ 440MHz, njalo ngo-2MHz, bese wenza igrafu noma uhlu lwedatha elinganisiwe.
(4) Qaphela ukuthi ingabe ifrikhwensi ehambisana nobuncane begagasi lokuma (i-antenna resonance frequency) icishe ibe ngu-435MHz.Uma i-frequency iphezulu kakhulu noma iphansi kakhulu, igagasi elimile lingalinganiswa futhi ngokufaka i-oscillator esebenzayo ngamamilimitha ambalwa ubude noma obufushane;
(5) Shintsha kancane ukuma kwe-short-circuit rod, futhi ulungise kaningi kahle i-capacitor ye-ceramic chip ukuze wenze igagasi lokuma le-antenna libe lincane ngangokunokwenzeka cishe ngo-435MHz.
Uma i-antenna ilungiswa, lungisa indawo eyodwa ngesikhathi, ukuze kube lula ukuthola umthetho woshintsho.Ngenxa yemvamisa yokusebenza ephezulu, i-amplitude yokulungiswa ayinkulu kakhulu.Isibonelo, umthamo olungisiwe we-fine tuning capacitor exhunywe ochungechungeni kubha ye-γ cishe u-3 ~ 4pF, futhi ukuguqulwa kwezingxenye eziyishumi ezimbalwa zendlela ye-PI (pF) kuzodala izinguquko ezinkulu kumagagasi amile.Ukwengeza, izici eziningi ezifana nobude bebha kanye nendawo yekhebula nazo zizoba nomthelela othile ekulinganisweni kwegagasi elimile, okufanele linakwe lapho kulungiswa.
Isikhathi sokuthumela: Nov-30-2022
