Eia nō ke kūkulu ʻana a me nā hoʻolālā kūkulu ʻana i kahi antenna Turnstile aʻu e hoʻohana ai no ke kamaʻilio lewa ma ka pā lekiō amateur 2 mika.

He antenna Turnstile me ka reflector ma lalo e hana i ka antenna maikaʻi no nā kamaʻilio wahi no ka mea e hoʻopuka ana i kahi ʻano hōʻailona polarized polarized a me kahi kumu ākea ākea kiʻekiʻe. Ma muli o kēia mau hiʻohiʻona, ʻaʻohe koi e hoʻohuli i ka antenna.

ʻO kaʻu mau pahuhopu hoʻolālā ʻo ia ka mea maʻalahi (ʻoiaʻiʻo!) A hana ʻia mai nā huahana i hāʻawi ʻia. I ka nānā ʻana i nā ʻano antenna ʻē aʻe, hoʻokahi mea i pilikia mau iaʻu, ʻo ia ka hoʻohana ʻana i ka coax (un-balanced feedline) a me ka hānai pololei ʻana i ka antenna (ka ukana kaulike maikaʻi). Wahi a nā puke antenna, hoʻomaka pinepine kēia kūlana i ka hoʻokumu ʻana i ka coax e hoʻomālamalama, a hoʻonāukiuki i ka nui o ka radiation radiation o ka antenna.

ʻO ka Anetena

ʻO kaʻu mea i koho ai, ʻo ia ka hoʻohana ʻana i nā "folded up dipoles" ma mua o nā mea maʻamau. Ma hope o kēlā, e hānai i ka ʻīpuka antenna me ka 1/2 wavelength 4:1 coaxial balun. Ke nānā nei kēia ʻano balun i ka pilikia "balance-to-unbalance" i ʻike pinepine ʻia.

ʻO ke kiʻi i helu ʻia ma lalo nei e hōʻike ana i ka hana ʻana i kahi antena puka. E ʻoluʻolu, ʻaʻole pili kēia.

ʻO ke kūkulu ʻia ʻana o kahi antenna reflector puka he 2 1/2 ka lōʻihi hawewe pololei dipoles i kuhikuhi ʻia 90 degere mai kēlā me kēia ʻano (e like me ka X nui). A laila e hānai i hoʻokahi dipole 90 degere ma waho o ka māhele o ka lua. ʻO kekahi pilikia me nā antenna Turnstile Reflector ʻo ia ka paʻakikī o ka hoʻopaʻa ʻana i ka ʻāpana reflector.

Laki (ʻaʻole ʻae paha kekahi) Ua koho wau e kūkulu i kaʻu antenna turnstile ma koʻu hale. Hoʻoponopono kēia i kahi pilikia ʻē aʻe no ka mea ʻaʻole pono wau e hopohopo iaʻu iho me ka hoʻoweliweli ʻana i ka antenna.

No nā dipoles i pelu ʻia ua hoʻohana au i 300 ohm televise twinlead. ʻO ka mea i loaʻa iaʻu ma ka lima, ua hoʻemi ʻia ke ʻano "foam". ʻO kēia alakaʻi pālua kikoʻī he 0.78.

E ʻike nō ʻoe ma ke kaha kiʻi ma luna nei ʻaʻole like ka nui o ka dipole i ka mea āu e manaʻo ai no 2 mika. ʻO kēia ka lōʻihi aʻu i ʻeha ai i ka pau ʻana o kaʻu hoʻoponopono ʻana no ka SWR liʻiliʻi. ʻIke ʻia ka helu helu o nā helu twinlead i ka resonance o ka dipole i pelu ʻia. E like me kā lākou e ʻōlelo nei, "E ʻokoʻa paha kāu mileage" ma kēia lōʻihi. E like me ka'u e olelo aku ai, aia ma ke ki'i ma luna o ka feedpoint o na dipole i pelu ia, aia ma ke kikowaena o ka dipole i pelu. Ua hana au i ke kaha ki'i penei no ka akaka.

ʻO ka Reflector

I mea e kiʻi ai i ke ʻano radiation i nā ʻōlelo aʻoaʻo i luna no nā kamaʻilio lewa, pono ka antenna turnstile i kahi reflector ma lalo. No ka la'ana laula, paipai ka puke antenna i ka hawewe 3/8 (30 iniha) ma waena o ka reflector a me ka puka. ʻO ka huahana aʻu i koho ai no ka reflector he hōʻike maʻamau ka pukaaniani home hiki iā ʻoe ke kiʻi ma kahi hale kūʻai lako.

E hōʻoia i ka pale metala no ka mea aia kekahi ʻano ʻano metala ʻole o ka pale pukaaniani a lākou e hāʻawi pū ai. Ua kūʻai au i lawa no ka hoʻolālā ʻana i kahi ʻāpana 8 kapuaʻi ma luna o nā kuʻekuʻe o koʻu attic. ʻAʻole hiki i ka hale kūʻai lako ke hāʻawi iaʻu i hoʻokahi mea nui no kēlā me kēia mea, no laila ua uhi au i nā mea hōʻike e pili ana i kahi wāwae ma ka hui. Mai ke kikowaena o ka reflector, ua ana au i 30 iniha (3/8 wavelength). ʻO kēia kahi e waiho ai ke kikowaena, a i ʻole ka hele ʻana ma waena o nā dipoles i pelu ʻia.

ʻO ke kāʻei hana

ʻAʻole paʻakikī loa kēia. ʻAʻole ia he mea ʻē aʻe ma mua o kahi ʻāpana 300 ohm twinlead he 1/4 hawewe uila ka lōʻihi. I koʻu kūlana, me ka helu helu o 0.78 ka lōʻihi he 15.75 iniha.

Ka Laina Hanai

Ua kūkulu au i kahi balun coaxial 4:1 e hoʻohālikelike i ka laina hānai i ka antenna.

E hoʻohana i kahi coax kiʻekiʻe, haʻahaʻa pohō inā he lōʻihi kāu e holo ai i kāu laina hānai. I koʻu hihia, makemake au i 15 kapuaʻi o ka coax no laila ua hoʻohana au i ka RG-8/U coax. ʻAʻole manaʻo pinepine ʻia kēia, akā me ka feedline i kēia pōkole aia ma lalo o 1 db poho. ʻO nā ana no ka loophole e pili ana i ka mea wikiwiki o ka coax i hoʻohana ʻia. E hoʻokuʻi i ka balun coaxial i ka wahi hānai o ka antenna turnstile, e like me ka mea i hōʻike ʻia ma ke kiʻi ma luna.

Nā Hualoaʻa

Hauʻoli loa wau i ka pono o kēia antenna. No ka mea, ʻaʻole au i koi i ka hoʻonui ʻia o kahi rotor AZ/EL, ua manaʻo maoli wau i ke kūʻai ʻana i kahi preamplifier Mirage. ʻOiai me ka ʻole o ka preamplifier, ʻo ka MIR spacecraft, a me ISS hoʻi e hoʻomaha piha i kaʻu mea hoʻokipa ke hana lākou me 20 deg. a ʻoi aku paha ma ka lani. Ma ka hoʻokomo ʻana i ka preamplifier, ua piha lākou i ka S-mika ma kahi o 5-10 deg. ma luna o ka manaʻo.