Antenna, oo ah sida anteeno jihada caadiga ah, ayaa si weyn loogu isticmaalaa HF, VHF iyo xargaha UHF. Yagi waa anteeno-toogashadeed oo ka kooban oscillator firfircoon (badiyaa oscillator), muuqaal muujinaya oo tiro badan oo ka mid ah hagida aan caadiga ahayn ee isbarbar socda.
Waxaa jira arrimo badan oo saamaynaya waxqabadka anteeno yaaga, iyo is-waafajinta anteeno yaagayaga yaanna ay ka sii adag tahay anteenada kale. Laba cabir oo anteeno ah ayaa inta badan la hagaajiyaa: soo noqnoqoshada soo noqnoqda iyo saamiga mowqifka taagan. Taasi waa, soo noqnoqoshada dib-u-soo-noqoshada anteenada waxaa lagu hagaajiyaa ku dhawaad 435mhz, oo saamiga mowduuca taagan ee anteenada ee anteenoku waa u dhowdahay 1 intii suurogal ah.
Samee anteeno ku dhawaad 1.5m dhulka, ku xir mitirka mowduuca taagan oo bilow cabirka. Si loo yareeyo khaladaadka cabirka, fiilada ku xiraya anteenada mitirka mowduuca taagan iyo raadiyaha mitirka mowjadaha taagan waa inay ahaadaan sida ugu macquulsan uguna macquulsan. Saddex meelood ayaa la hagaajin karaa: awoodda trimmer upicitor, jagada xarkaha wareega gaagaaban iyo dhererka oscillator firfircoon. Tallaabooyinka hagaajinta gaarka ah waa sida soo socota:
(1) Hagaaji galka wareega gaagaaban 5 ~ 6cm ka fog barta iskutallaabta;
(2) Inta jeer ee gudbinta waxaa lagu hagaajiyaa 435mhz, oo reer Suurakiinna dhoobada ayaa la isku hagaajiyaa si loo yareeyo mowjadaha taagan ee anteenada taagan;
(3) Cabir mowjadda taagan ee anteenada laga bilaabo anteenooyinka laga bilaabo 430 ~ 440mhz, 2mhz kasta, oo samee garaaf ama liistada xogta la cabiro.
(4) U fiirso bal in soo noqnoqoshada u dhigma hirarka ugu yar ee taagan (anteeno-ka-soo-baxa) waa qiyaastii 435mhz. Haddii soo noqnoqoshada ay aad u sarreyso ama aad u hooseyso, mowjadda taagan ayaa mar labaad lagu cabiri karaa iyadoo la beddelayo oscillator firfircoon dhowr milimitir oo ka gaaban ama ka gaaban;
(5) Waxyar ayaa beddelaya booska usha-wareega-gaaban, oo si isdaba joog ah u heellan u-heeso-ka-qaadida chip chip-ka si looga dhigo mowjadaha taagan ee anteenada ah si ay ugu yar tahay anteenada ugu yar ee ugu yar qiyaastii 435mhz.
Marka anteeyada la hagaajiyo, la hagaajiyo hal meel markiiba, si ay u fududaato in la helo qaanuunka isbedelka. Sababo la xiriira soo noqnoqoshada shaqada ee sare, codka isku-habeynta ma ahan mid aad u weyn. Tusaale ahaan, awoodda la hagaajiyay ee ganaax ganaax ee ku xidhnaa taxanaha Thγ baarka γ waa qiyaastii 3 ~ 4pf, iyo isbedelka dhowr meelood ee hab-hagitaan (PF) ayaa sababi kara isbeddelo weyn oo ku saabsan mowjadaha taagan. Intaas waxaa sii dheer, arrimo badan oo ay ka mid yihiin dhererka baararka iyo booska fiilada fiilada ayaa sidoo kale saameyn gaar ah ku yeelan doona cabirka mowjadda mowduuca taagan, kaas oo loo fiirsanayo hanaanka hagaajinta.
Waqtiga Post: Noven-30-2022
