Momwe Mungapangire Mlongoti wa J-Pole wa 70cm Ham Band

Nayi mlongoti wa J-pole wotchipa womwe ndi wosavuta kupanga. Pafupifupi nthawi ya maola, komanso zinthu zamtengo wapatali za $ 10, mutha kukhala ndi mlongoti wodabwitsa wa omnidirectional j-pole. Mlongoti uwu umachokera pamalingaliro omwewo monga mapulani anga omanga a 2 Meter J-Pole. Mlongoti wa j-pole kwenikweni ndi mathero odyetsedwa makumi asanu peresenti ya dipole omwe amagwiritsa ntchito 1/4 wave shorted wofananira stub ngati chosinthira chosatheka. Mlongoti wa j-pole udzapereka zocheperapo kuposa 3 DB zopeza omnidirectional.

Zomwe ndidasankha popanga mlongoti wa j-pole zinali 1/2 inchi yamkuwa yomwe imagwiritsidwa ntchito popanga mipope. Nawa njira zake:

Miyezo yomwe ili pamwambapa ya J-pole ndi mainchesi, komanso si yachilendo kwa 440 mHz. J-pole antenna. Izi ndi zomwe zidanditengera kuti ndichepetse SWR. Miyezo yautali wamba, ndi kukula kwa nthiti kumachokera pakati pa payipi yolekanitsa (yowongoka) mpaka pamwamba pa mlongoti. Ulalo woyezera ndi mainchesi 1 1/2 kuchokera pamwamba pa otenga nawo mbali yopingasa mpaka pomwe pali ulalo. Kusiyanasiyana pakati pa chigawo choyambirira cha j-pole centerline ndi kusintha kwa stub centerline ndi 0.75 ″.

Ndinadula kukula kwa RG-8X foam coax mpaka kukula kwa 67 ″ kwa feedline, ndikuzunguliranso maulendo anayi (ang'onoang'ono momwe mungathere) zomwe zalembedwa pansipa gawo lopingasa la malo ofananira. Izi zidzathetsanso mzere wa chakudya kuchokera ku mlongoti wa j-pole, ndikuthandiziranso kupereka chitetezo champhezi. Lumikizani chowongolera cha coax ku chinthu chachikulu, komanso chishango ku chowongolera cha j-pole. Kuti ndikwaniritse muyeso uwu, ndimagwiritsa ntchito 4/1 ″ Tee ya chitoliro, komanso "Steet Arm joint". Asanawapange wina ndi mzake, ndinadula chitoliro cha exess pamalo olumikizirana ndisanakumane.

Ndimakakamira kwakanthawi kogwiritsa ntchito ma chubu 1 inchi, ndikusintha ulalo wa coax kuti ukhale wotsika mtengo kwambiri wa SWR. Kuchokera pamenepo, ndimasintha kutalika kwa chinthu chachikulu cha J-pole. Pambuyo pake ndikuyambanso ndikusinthanso kugwirizana kwa coax.

Chomwe chosinthira chimalumikizana ndi chinthu chachikulu ndicho maziko a j-pole antenna. Chifukwa chake mutha kupanga kutalika kwamtundu uliwonse. Lingaliro labwino kwambiri kuti mupereke malo pansipa. Izinso zidzathandizadi ndi chitetezo champhezi. (mwapereka nsanja yanu ndiyokhazikika!) Ingogwiritsani ntchito solder ya rosin-core. Osagwiritsa ntchito "plumbing solder", acid-core solder, kapena mapaipi phala. Asidi omwe ali muzinthuzi amaphwanya cholumikizira cha solder pamene magetsi akupezekapo adutsamo.

Nachi chithunzi cha 70 centimita j-pole antenna yomwe ndimagwiritsa ntchito:

Izi zakhala zikuchitika kwa zaka 7. Mutha kuwona momwe chitoliro chimasinthira wakuda kuchokera kunyengo. Izi ndizabwinobwino, komanso sizimawononga magwiridwe antchito a mlongoti.