Yagi antenna, seyekirasi inotungamira antenna, inoshandiswa zvakanyanya muHF, VHF uye UHF mabhendi.Yagi ndeyekupedzisira-kupfura antenna iyo ine inoshanda oscillator (kazhinji yakapetwa oscillator), passive reflector uye akati wandei maitirwo egwara rakarongwa mukufanana.
Pane zvakawanda zvinokanganisa kuita kweYagi antenna, uye kugadziridzwa kweYagi antenna kwakaoma kupfuura mamwe antenna.Maparamita maviri eantenna anonyanya kugadziriswa: resonant frequency uye kumira wave ratio.Ndokunge, iyo resonant frequency yeantenna inogadziriswa kutenderera 435MHz, uye yakamira wave ratio yeantenna iri padyo ne1 sezvinobvira.
Misa antenna ingangoita 1.5m kubva pasi, batanidza yakamira wave mita uye tanga kuyerwa.Kuti uderedze zvikanganiso zvekuyera, tambo inobatanidza antenna kune yakamira wave mita uye redhiyo kune yakamira wave mita inofanira kunge ipfupi sezvinobvira.Nzvimbo nhatu dzinogona kugadziridzwa: kugona kweiyo trimmer capacitor, nzvimbo yepfupi yedunhu bar uye kureba kweiyo inoshanda oscillator.Matanho ekugadzirisa chaiwo ndeaya anotevera:
(1) Gadzirisa bhaa pfupi yedunhu 5 ~ 6cm kubva pamuchinjikwa;
(2) Iyo frequency ye transmitter inogadziridzwa kusvika 435MHz, uye capacitor yeceramic inogadziriswa kuti ideredze kumira kwakamira kweantenna;
(3) Edza kumira kweiyo antenna kubva 430 ~ 440MHz, yega yega 2MHz, uye ita girafu kana runyorwa rwe data yakayerwa.
(4) Tarisa uone kana frequency inoenderana neishoma yakamira wave (antenna resonance frequency) iri kutenderera 435MHz.Kana kuwanda kwakanyanyisa kana kuderera, mhepo yakamira inogona kuyerwa zvakare nekutsiva inoshanda oscillator mamirimita mashoma kureba kana kupfupika;
(5) Chinja zvishoma chinzvimbo chepfupi-sekete tsvimbo, uye dzokorora zvakanaka-tuna capacitor yeceramic chip kuita kuti antenna imire wave idiki sezvinobvira kutenderera 435MHz.
Kana antenna ichigadziriswa, gadzirisa nzvimbo imwe panguva, kuitira kuti zvive nyore kuwana mutemo wekuchinja.Nekuda kweiyo yakakwira yekushanda frequency, iyo amplitude yekugadziriswa haisi yakakura kwazvo.Semuenzaniso, iyo yakagadziridzwa kugona kweiyo yakanaka tuning capacitor yakabatana munhevedzano pa γ bar inenge 3 ~ 4pF, uye shanduko yezvikamu zvishoma zvegumi zvePI nzira (pF) ichakonzera shanduko huru mukumira wave.Uye zvakare, zvakawanda zvinhu zvakadai sekureba kwebhari uye chinzvimbo chengarava chichavawo chine chekuita nekuyerwa kwekuyerwa kwamasere, izvo zvinofanirwa kutariswa mukugadzirisa maitiro.
Nguva yekutumira: Nov-30-2022
