Mlongoti wa Yagi, ngati mlongoti wolunjika, umagwiritsidwa ntchito kwambiri m'magulu a HF, VHF ndi UHF.Yagi ndi mlongoti wowombera kumapeto womwe umakhala ndi oscillator yogwira (nthawi zambiri ndi oscillator), chowunikira komanso maupangiri angapo omwe amapangidwa molumikizana.
Pali zinthu zambiri zomwe zimakhudza magwiridwe antchito a mlongoti wa Yagi, ndipo kusintha kwa mlongoti wa Yagi ndikovuta kwambiri kuposa tinyanga zina.Magawo awiri a mlongoti amasinthidwa makamaka: ma frequency a resonant ndi mafunde oima.Ndiye kuti, ma frequency a resonant antenna amasinthidwa mozungulira 435MHz, ndipo mafunde oyimirira a mlongoti ali pafupi ndi 1 momwe angathere.
Khazikitsani mlongoti pafupifupi 1.5m kuchokera pansi, lumikizani mita yoyimirira ndikuyamba kuyeza.Kuti muchepetse zolakwika zoyezera, chingwe cholumikizira mlongoti ku mita yoyimilira yoweyula ndi wailesi ku mita yoyimilira yoyezera iyenera kukhala yaifupi momwe ingathere.Malo atatu amatha kusinthidwa: mphamvu ya trimmer capacitor, malo a kapamwamba kakang'ono kakang'ono ndi kutalika kwa oscillator yogwira.Zosintha zenizeni ndi izi:
(1) Konzani kapamwamba kakang'ono ka 5 ~ 6cm kutali ndi mtanda;
(2) Mafupipafupi a transmitter amasinthidwa kukhala 435MHz, ndipo capacitor ya ceramic imasinthidwa kuti muchepetse kuyimirira kwa mlongoti;
(3) Yezerani kuima kwa mlongoti kuchokera ku 430 ~ 440MHz, 2MHz iliyonse, ndikupanga graph kapena mndandanda wa deta yoyezedwa.
(4) Onani ngati ma frequency ofananira ndi mafunde ocheperako (mlongoti wa resonance frequency) ndi pafupifupi 435MHz.Ngati mafupipafupi ali okwera kwambiri kapena otsika kwambiri, mafunde oyimirira amatha kuyesedwa kachiwiri posintha oscillator yogwira mamilimita angapo kutalika kapena kufupi;
(5) Sinthani pang'ono malo a ndodo yachidule, ndipo bwerezani konzani capacitor ya chipangizo cha ceramic kuti mlongoti ayimire mafunde ang'ono momwe mungathere mozungulira 435MHz.
Pamene mlongoti wasinthidwa, sinthani malo amodzi panthawi, kuti zikhale zosavuta kupeza lamulo la kusintha.Chifukwa cha kuchuluka kwa magwiridwe antchito, matalikidwe akusintha siakulu kwambiri.Mwachitsanzo, mphamvu yosinthidwa ya capacitor yabwino yolumikizidwa pamndandanda wa γ bar ndi pafupifupi 3 ~ 4pF, ndipo kusintha kwa magawo khumi a njira ya PI (pF) kudzabweretsa kusintha kwakukulu pamafunde oyimirira.Kuonjezera apo, zinthu zambiri monga kutalika kwa bar ndi malo a chingwe zidzakhalanso ndi zotsatira zina pa kuyeza kwa mafunde oyimirira, omwe ayenera kutsatiridwa pakukonzekera kusintha.
Nthawi yotumiza: Nov-30-2022
