I-Yagi Antenna, njenge-antenna eqondile yakudala, isetshenziswa kabanzi kuma-HF, VHF kanye ne-UHF BAND. I-Yagi yi-antenna edutshulwa ekugcineni equkethe i-oscillator esebenzayo (imvamisa i-oscillator egoqiwe), isibonisi esingenangqondo kanye nezinkomba eziningi ze-pare.
Kunezinto eziningi ezithinta ukusebenza kwe-yagi antenna, futhi ukulungiswa kwe-antenna yagi kuyinkimbinkimbi kakhulu kunezinye izimpondo. Amapharamitha amabili e-antenna alungiswa kakhulu: imvamisa evumayo kanye nokulinganiselwa kokuma kwezakhiwo. Okungukuthi, imvamisa evumayo ye-antenna ilungiswa cishe ngo-435mhz, futhi isilinganiso sokuma sempi ye-antenna siseduze no-1 ngangokunokwenzeka.
Setha i-antenna cishe ngo-1.5m emhlabathini, xhuma imitha yegagasi elimile bese uqala ukulinganisa. Ukuze unciphise amaphutha wokulinganisa, ikhebula elixhuma i-antenna kumitha yokuma kwegagasi bese umsakazo kwimitha yokuma wave kufanele ube mfushane ngangokunokwenzeka. Izindawo ezintathu zingashintshwa: umthamo we-capacitor ye-trimmer, isikhundla sebha yokujikeleza emfushane kanye nobude be-oscillator esebenzayo. Izinyathelo ezithile zokulungiswa zinjengokulandelayo:
(1) lungisa ibha yokujikeleza emfushane 5 ~ 6cm kude nebha yesiphambano;
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(3) Kala igagasi elimile le-antenna kusuka ku-430 ~ 440mhz, njalo nge-2mhz, bese wenza igrafu noma uhlu lwedatha elinganisiwe.
(4) Bheka ukuthi imvamisa ehambelana negagasi eliphansi lokuma (imvamisa ye-antenna resonance) icishe ibe ngu-435mhz. Uma imvamisa iphakeme kakhulu noma iphansi kakhulu, igagasi elimile lingalinganiswa futhi ngokufaka esikhundleni se-oscillator esebenzayo amamitha ambalwa amamitha ambalwa noma amafushane;
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Lapho i-antenna ilungiswa, shintsha indawo eyodwa ngasikhathi, ukuze kube lula ukuthola umthetho wokushintsha. Ngenxa yemvamisa ephezulu yokusebenza, ukusondela kokulungiswa akukukhulu kakhulu. Isibonelo, umthamo olungisiwe we-capacitor enhle exhunywe kuchungechunge kwi-γ bar cishe cishe 3 ~ 4pf, kanye nokushintshwa kwezishumi ezimbalwa zendlela ye-PI (PF) kuzodala ushintsho olukhulu ku-State Wave. Ngaphezu kwalokho, izici eziningi ezifana nobude be-bar kanye nesikhundla sekhebula nazo zizoba nomthelela othile ekulinganiseni i-sting wave, okufanele unake kwinqubo yokuma.
Isikhathi sePosi: Nov-30-2022
