Nali i-J-pole antenna engabizi kakhulu futhi kulula ukulakha. Ngokuphathelene nesikhathi samahora, kanye nokuphathelene nempahla ebiza kakhulu engu-$10, ungaba ne-omnidirectional j-pole antenna emangalisayo. Le antenna isuselwe emicabangweni efanayo nezinhlelo zami zokwakha ezingama-2 Meter J-Pole. I-antenna ye-j-pole empeleni iyisiphetho esinikezwe amaphesenti angamashumi amahlanu we-wave dipole esebenzisa i-1/4 wave shorted stub efana nesiguquli esingathinteki. I-antenna ye-j-pole izokhiqiza kancane kancane kune-3 DB yenzuzo ye-omnidirectional.
Into engayikhetha ukuze ngithuthukise i-antenna ye-j-pole kwakuyipayipi lethusi elingu-1/2 intshi elisetshenziselwa ukufaka amapayipi. Nanka amasu:
Izilinganiso ezingenhla ze-J-pole zingamayintshi, futhi azivamile ku-440 mHz. I-J-pole antenna. Yilokhu okwangithatha ukuze ngithole i-SWR ephansi. Ubukhulu ngobude obujwayelekile, nosayizi we-stub kusuka emugqeni omaphakathi wepayipi lokuhlukanisa (uqonde) ukuya phezulu kothi. Isixhumanisi esilinganisweni singamayintshi angu-1 1/2 ukusuka phezulu komhlanganyeli ovundlile ukuya endaweni yesixhumanisi. Ububanzi obuphakathi kwengxenye eyinhloko ye-j-pole centerline kanye ne-stub centerline yokulungisa ngu-0.75 ″.
Ngisike usayizi we-RG-8X we-foam coax waba usayizi ongu-67 ″ ku-feedline, futhi ngiphinde ngijike amajika angu-4 (amancane ngendlela ongayithola) asanda kukleliswa ngaphansi kwengxenye evundlile yendawo efanayo. Lokhu kuzosusa umugqa wokuphakelayo ku-antenna ye-j-pole, futhi kusize ekuhlinzekeni ukuphepha okuthile kombani. Xhuma umqhubi wesikhungo we-coax nento eyinhloko, kanye nesihlangu ku-tuning stub ye-j-pole. Ukuze Ngifeze lesi silinganiso, ngisebenzisa i-Tee yepayipi engu-1/2 ″, kanye "Nenhlangano ye-Steet Arm". Ngaphambi kokuwakha omunye nomunye, nganqamula ipayipi le-exess ejoyintini ngaphambi kokuhlanganisa.
Nginamathisela okwesikhashana i-coax ngisebenzisa izinsimbi zeshubhu eziyi-1 intshi, futhi ngilungisa isixhumanisi se-coax kuqala ku-SWR ethengeka kakhulu. Ukusuka lapho, ngilungisa ubude besici esikhulu se-J-pole. Ngemuva kwalokho ngiqala kabusha ngokulungisa kabusha ukuxhumana kwe-coax.
Isici lapho i-stub yokulungisa ixhumeka khona kusici esikhulu into ephansi ye-antenna ye-j-pole. Yingakho ungenza noma yiluphi uhlobo lobude. Kungumqondo omuhle ukunikeza indawo engezansi. Nalokhu ngokuqinisekile kuzosiza ngokuvikeleka kombani. (uma umbhoshongo wakho usekelwe ngokufanele!) Vele usebenzise i-rosin-core solder. Ungasebenzisi "i-solder yamapayipi", i-acid-core solder, noma unamathisele amapayipi. I-asidi ekulezi zinto iphula ilunga le-solder lapho ugesi okhona udlula kuwo.
Nasi isithombe se-antenna engu-70 centimeters engisisebenzisayo:
Lokhu sekuphele iminyaka eyi-7. Ungabona ukuthi ipayipi iguqula kanjani umnyama esimweni sezulu. Lokhu kuvamile, futhi akulimazi nhlobo ukusebenza kwe-antenna.