Lapha kukhona amapulani okwakha nawokwakha othi lwe-Turnstile engilusebenzisela ukuxhumana nomkhathi ebhendini yomsakazo engamamitha ama-2.

I-antenna ephendukayo ene-reflector ngaphansi kwayo yenza uthi olulungile lokuxhumana kwendawo ngoba lukhiqiza iphethini yesiginali eyisiyingi futhi inephethini ye-engeli ebanzi, ephezulu. Ngenxa yalezi zici, asikho isidingo sokuzungezisa uthi.

Imigomo yami yokuklama yayiwukuthi kwakufanele ibe eshibhile (impela!) futhi yenziwe ngemikhiqizo enikezwa kalula. Ekuhloleni ezinye izitayela ze-antenna zesango, into eyodwa ebilokhu ingikhathaza ukuthi zisebenzisa i-coax (umugqa wokuphakelayo ongalingani) kanye nokuphakelayo okuqondile kwe-antenna (umthwalo olinganiselayo). Ngokusho kwezincwadi ze-antenna, lesi simo ngokuvamile sivame ukudala i-coax ukuze ikhiphe, futhi sicasule ingqikithi yephethini yemisebe ye-antenna.

I-Antenna

Engikhethe ukukwenza ukusebenzisa "i-dipoles egoqiwe" kunejwayelekile. Ngemuva kwalokho phakela i-antenna yesango nge-coaxial balun engu-1/2 ye-wavelength 4:1. Lolu hlobo lwe-balun luphinde lubheke udaba "lwebhalansi-kuya-ukungalingani" oluvame ukuvela nalo.

Umdwebo obhalwe ngezansi ubonisa indlela yokwenza uthi lwesango. Sicela uqaphele, lokhu akuwona umkhawulo.

Ukwakhiwa kwe-antenna yesibonisi sesango kuqukethe ama-dipoles aqondile angu-2 1/2 aqondiswe kuma-degree angama-90 ukusuka kokunye okuhlukahlukene (njenge-X enkulu). Bese wondla i-dipole eyodwa 90 degrees ngaphandle kwesigaba sesi-2. Inkinga eyodwa ngama-antenna e-Turnstile Reflector ukuthi uhlaka lokubamba ingxenye yesibonisi lungaba nzima.

Ngenhlanhla (abanye bangase bangavumelani) ngikhethe ukwakha i-antenna yami ye-turnstile ekamelweni lami elingaphansi. Lokhu kubhekana nenye inkinga ngoba nami angidingi ukuzikhathaza ngayo wukumisa i-antenna.

Kuma-dipoles agoqiwe ngisebenzise i-twinlead yethelevishini engu-300 ohm. Enganginakho kwakuncishisiwe ukulahlekelwa "igwebu" uhlobo. Lokhu kuhola okukabili okuqondile kunesilinganiso sesilinganiso esingu-0.78.

Ngokuqinisekile uzoqaphela futhi emdwebeni ongenhla ukuthi osayizi be-dipole abayona into obungayilindela ngamamitha angu-2. Lobu ubude engabuhlanganisa lapho ngiqeda ukulungisa ukuze ngithole i-SWR encane. Ngokusobala inani lesilinganiso sezinombolo zamawele ku-resonance ye-dipole egoqiwe. Njengoba bethi, "Imayela lakho lingahluka" kulobu bude. Ngingathanda ngokunjalo ukusho ukuthi emfanekisweni ophezu kwendawo yokuphakelayo ye-dipoles egoqiwe empeleni iphakathi nendawo ye-dipole egoqiwe. Ngenze umdwebo ngale ndlela ukuze ucace.

I-Reflector

Ukuze uthole iphethini yemisebe emiyalweni ephezulu yokuxhumana emkhathini uthi oluphendukayo ludinga isibonisi ngaphansi kwalo. Ngephethini ebanzi izincwadi ze-antenna zincoma ubude begagasi obungu-3/8 (amayintshi angu-30) phakathi kwesibonisi nesango. Umkhiqizo engiwukhethele isibonisi uyisibonisi esijwayelekile sefasitela lasekhaya ongasilanda esitolo sezingxenyekazi zekhompyutha.

Qiniseka ukuthi isikrini sensimbi njengoba kukhona uhlobo olungezona ezensimbi lwesikrini sewindi abalunikezayo futhi. Ngithenge okwanele ukucacisa isikwele esingamamitha angu-8 kumapulangwe e-attic yami. Isitolo sezingxenyekazi zekhompiyutha asikwazanga ukunginikeza into eyodwa enkulu kukho konke lokhu, ngakho ngadlula izinto zokubonisa ngokuphathelene nonyawo ejoyintini. Kusukela maphakathi nesibonisi, ngilinganise ama-intshi angu-30 (3/8 wavelength). Yilapho isikhungo, noma ukuwela isici se-dipoles eligoqiwe kulele.

I-Phasing Harness

Lokhu akwenziwa inkimbinkimbi nhlobo. Akuselutho neze ukuthi ucezu lwe-300 ohm twinlead olungu-1/4 we-wavelength kagesi ubude. Esimweni sami, ngesilinganiso esiguquguqukayo esingu-0.78 ubude buyi-15.75 amayintshi.

I-Feedline

Ngakhe i-coaxial balun engu-4:1 ukuze ihambisane nomugqa wokuphakelayo nothi Emdwebeni ongezansi kukhona ulwazi lwesakhiwo.

Sebenzisa ikhwalithi ephezulu, i-coax yokulahlekelwa okuphansi uma unendlela ende yokusebenzisa ulayini wakho wokuphakelayo. Endabeni yami, ngangidinga izinyawo ezingu-15 kuphela ze-coax ngakho ngasebenzisa i-RG-8/ U coax. Lokhu akuvamile ukuphakanyiswa, kodwa ngomugqa wokuphakelayo lo mfushane kunokulahlekelwa okungaphansi kuka-1 db. Izilinganiso ze-lophole zincike kusici sesivinini se-coax esetshenzisiwe. Xhuma i-coaxial balun nendawo yokuphakelayo ye-antenna ephendukayo, njengoba kuboniswe kumdwebo ongenhla.

Imiphumela

Ngijabule kakhulu ngokusebenza kahle kwale antenna. Ngenxa yokuthi angizange ngifune izindleko ezingeziwe ze-rotor ye-AZ/EL, ngizizwe nginesizathu sokuthenga i-Mirage preamplifier. Ngisho nangaphandle kwe-preamplifier, umkhumbi-mkhathi we-MIR, kanye ne-ISS zigcwele ukuthula kusamukeli wami uma zihlobene no-20 deg. noma okukhulu esibhakabhakeni. Ngokufaka i-preamplifier, isikali esigcwele ku-S-meter cishe ku-5-10 deg. ngaphezu kombono.