Yagi antenna, e le antenna ea khale ea tataiso, e sebelisoa haholo ho lihlopha tsa HF, VHF le UHF.Yagi ke lenakana la ho qetela le nang le oscillator e sebetsang (hangata e le oscillator e mennweng), ponts'o e sa bonahaleng le litataiso tse ngata tse hlophisitsoeng tse hlophisitsoeng ka ho bapisa.
Ho na le lintlha tse ngata tse amang ts'ebetso ea Yagi antenna, 'me tokiso ea Yagi antenna e rarahane ho feta li-antenna tse ling.Mekhahlelo e 'meli ea antenna e fetoloa haholo-holo: maqhubu a resonant le sekhahla sa maqhubu a emeng.Ke hore, maqhubu a resonant a antenna a lokisoa ho pota 435MHz, 'me tekanyo ea maqhubu a emeng ea antenna e haufi le 1 kamoo ho ka khonehang.
Seta lenakana le ka bang 1.5m ho tloha fatše, hokela mithara e emeng ea leqhubu ebe o qala tekanyo.E le ho fokotsa liphoso tsa ho lekanya, thapo e hokahanyang lenakana ho methareng ea leqhubu le emeng le seea-le-moea ho methareng ea leqhubu le emeng e lokela ho ba khuts'oane ka hohle kamoo ho ka khonehang.Libaka tse tharo li ka fetoloa: matla a trimmer capacitor, boemo ba sebaka se sekhutšoanyane sa potoloho le bolelele ba oscillator e sebetsang.Mehato e khethehileng ea ho lokisoa ke e latelang:
(1) Lokisa sebaka se khuts'oane sa potoloho 5 ~ 6cm hole le bareng ea sefapano;
(2) Maqhubu a transmitter a fetoloa ho 435MHz, 'me capacitor ea ceramic e fetoloa ho fokotsa leqhubu le emeng la antenna;
(3) Lekanya leqhubu le emeng la antenna ho tloha 430 ~ 440MHz, 2MHz e 'ngoe le e' ngoe, 'me u etse kerafo kapa lethathamo la lintlha tse lekantsoeng.
(4) Ela hloko hore na maqhubu a tsamaisanang le maqhubu a emeng (antenna resonance frequency) a haufi le 435MHz.Haeba maqhubu a le holimo haholo kapa a le tlase haholo, leqhubu le emeng le ka lekanyetsoa hape ka ho nkela oscillator e sebetsang sebaka sa limilimithara tse 'maloa nako e telele kapa e khuts'oane;
(5) Fetola hanyenyane boemo ba molamu oa potoloho e khuts'oane, 'me khafetsa u lokise capacitor ea chip ea ceramic ho etsa hore leqhubu le eme le le lenyane ka hohle kamoo ho ka khonehang ho potoloha 435MHz.
Ha antenna e lokisoa, fetola sebaka se le seng ka nako, e le hore ho be bonolo ho fumana molao oa phetoho.Ka lebaka la lebelo le phahameng la ho sebetsa, amplitude ea tokiso ha e kholo haholo.Ka mohlala, matla a fetotsoeng a capacitor e ntle ea tokiso e hokahaneng letotong la γ e ka ba 3 ~ 4pF, 'me phetoho ea karolo ea leshome ea mokhoa oa PI (pF) e tla baka liphetoho tse kholo ho leqhubu le emeng.Ho phaella moo, lintlha tse ngata tse kang bolelele ba bar le boemo ba mohala le tsona li tla ba le tšusumetso e itseng ho lekanya ha leqhubu le emeng, le lokelang ho lebisoa tlhokomelo ho ts'ebetsong ea ho lokisa.
Nako ea poso: Nov-30-2022
