I-antenna ye-Yagi, njenge-eriyali ye-classical directional, isetyenziswa ngokubanzi kwiibhendi ze-HF, VHF kunye ne-UHF.I-Yagi yi-eriyali yokudubula yokuphela equkethe i-oscillator esebenzayo (ngokuqhelekileyo i-oscillator egoqiweyo), i-reflector ye-passive kunye nenani lezikhokelo ze-passive ezicwangciswe ngokufanayo.
Zininzi izinto ezichaphazela ukusebenza kwe-eriyali ye-Yagi, kwaye ukulungiswa kwe-eriyali ye-Yagi kunzima ngakumbi kunezinye ii-eriyali.Iiparamitha ezimbini ze-eriyali zihlengahlengiswa ikakhulu: i-resonant frequency kunye ne-stand wave ratio.Oko kukuthi, i-resonant frequency ye-eriyali ihlengahlengiswa malunga ne-435MHz, kwaye umlinganiselo wamaza omileyo we-eriyali usondele kwi-1 kangangoko kunokwenzeka.
Misa i-eriyali malunga ne-1.5m ukusuka emhlabeni, qhagamshela imitha yamaza omileyo kwaye uqalise umlinganiselo.Ukuze kuncitshiswe iimpazamo zokulinganisa, intambo edibanisa i-eriyali kwiimitha zamaza emileyo kunye nonomathotholo kwiimitha zamaza emileyo kufuneka ibemfutshane kangangoko.Iindawo ezintathu zinokuhlengahlengiswa: umthamo we-trimmer capacitor, indawo yebar yesiphaluka esifutshane kunye nobude be-oscillator esebenzayo.Amanyathelo ohlengahlengiso athile ngolu hlobo lulandelayo:
(1) Lungisa ibha yesekethe emfutshane 5 ~ 6cm kude nebar yomnqamlezo;
(2) I-frequency ye-transmitter ihlengahlengiswa ukuya kwi-435MHz, kwaye i-capacitor ye-ceramic ihlengahlengiswa ukunciphisa i-antenna yokuma;
(3) Ukulinganisa igagasi lokuma le-eriyali ukusuka kwi-430 ~ 440MHz, yonke i-2MHz, kwaye wenze igrafu okanye uluhlu lwedatha elinganisiweyo.
(4) Jonga ukuba i-frequency ehambelana nowona maza asezantsi okuma (i-antenna resonance frequency) ijikeleze i-435MHz.Ukuba i-frequency iphezulu kakhulu okanye iphantsi kakhulu, i-wave yokuma inokulinganiswa kwakhona ngokutshintsha i-oscillator esebenzayo iimilimitha ezimbalwa ubude okanye mfutshane;
(5) Guqula kancinane indawo yentonga yesekethe emfutshane, kwaye ngokuphindaphindiweyo lungisa i-capacitor ye-ceramic chip ukwenza i-eriyali yokuma yamaza ibencinci kangangoko malunga ne-435MHz.
Xa i-eriyali ilungiswa, lungisa indawo enye ngexesha, ukuze kube lula ukufumana umgaqo wokutshintsha.Ngenxa yobuninzi bokusebenza okuphezulu, i-amplitude yohlengahlengiso ayinkulu kakhulu.Ngokomzekelo, umthamo ohlengahlengisiweyo we-fine tuning capacitor edibeneyo kwi-series kwi-γ bar malunga ne-3 ~ 4pF, kwaye utshintsho lweshumi ezimbalwa zendlela ye-PI (pF) iya kubangela utshintsho olukhulu kumaza okuma.Ukongeza, izinto ezininzi ezifana nobude bebha kunye nendawo yekhebula nazo ziya kuba nefuthe elithile kumlinganiselo wamaza omileyo, okufuneka kuqwalaselwe ingqalelo kwinkqubo yohlengahlengiso.
Ixesha lokuposa: Nov-30-2022
