{"id":164,"date":"2025-02-27T10:35:55","date_gmt":"2025-02-27T07:35:55","guid":{"rendered":"https:\/\/ta9ea.com\/?p=164"},"modified":"2025-02-27T10:35:55","modified_gmt":"2025-02-27T07:35:55","slug":"ev-yapimi-sirali-rf-ornekleyici","status":"publish","type":"post","link":"https:\/\/ta9ea.com\/?p=164","title":{"rendered":"Ev Yap\u0131m\u0131 S\u0131ral\u0131 RF \u00d6rnekleyici"},"content":{"rendered":"

Bir RF \u00f6rnekleme cihaz\u0131, koaksiyel bir hatta yay\u0131lan RF sinyalinin d\u00fc\u015f\u00fck g\u00fc\u00e7 g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc sa\u011flar. Bir g\u00fc\u00e7 kayna\u011f\u0131 (verici veya amplifikat\u00f6r) ile sonland\u0131rma y\u00fck\u00fc aras\u0131na yerle\u015ftirilen 3 portlu bir cihazd\u0131r ve \u00f6rnekleme \u00e7\u0131k\u0131\u015f\u0131 (\u00fc\u00e7\u00fcnc\u00fc port) bir \u00f6l\u00e7\u00fcm ekipman\u0131na (g\u00fc\u00e7 \u00f6l\u00e7er, spektrum analiz\u00f6r\u00fc, osiloskop vb.) ba\u011fl\u0131d\u0131r.<\/span><\/p>\n

Tipik bir \u00f6rnekleme cihaz\u0131n\u0131n baz\u0131 \u00f6zellikleri a\u015fa\u011f\u0131da \u00f6zetlenmi\u015ftir:<\/span>
\n– Ana portlar\u0131 ile \u00f6rnekleme portu aras\u0131nda bilinen bir zay\u0131flama olmal\u0131d\u0131r.<\/span>
\n– Zay\u0131flama grafi\u011fi, kullan\u0131labilir frekans aral\u0131\u011f\u0131 boyunca m\u00fcmk\u00fcn oldu\u011funca d\u00fcz olmal\u0131d\u0131r.<\/span>
\n– Test edilen vericinin g\u00fcc\u00fcn\u00fc kald\u0131rabilmelidir.<\/span>
\n– Duran Dalga Oran\u0131 (SWR), frekans aral\u0131\u011f\u0131 boyunca d\u00fc\u015f\u00fck olmal\u0131d\u0131r.<\/span><\/p>\n

B\u00f6yle bir \u00f6rnekleme cihaz\u0131 tasarlamak i\u00e7in birka\u00e7 y\u00f6ntem vard\u0131r ancak en basitlerinden biri, diren\u00e7li bir b\u00f6l\u00fcc\u00fc ile ili\u015fkili 50 ohm’luk bir hat kullanmakt\u0131r. Y\u0131llar \u00f6nce, W. Hayward, W7ZOI QST’de (1) b\u00f6yle bir cihaz\u0131 tan\u0131mlad\u0131: Hammond 1590A d\u00f6k\u00fcm kutunun i\u00e7inde pirin\u00e7 \u015ferit hat kulland\u0131.<\/span><\/p>\n

Tasar\u0131m\u0131m\u0131 yapmam\u0131n sebebi, kopyalanmas\u0131 daha kolay bir \u015fey istememdi, bu y\u00fczden Hayward’\u0131n \u015ferit \u00e7izgisi yerine \u00e7ift tarafl\u0131 Epoksi PCB’nin bir taraf\u0131na kaz\u0131nm\u0131\u015f 50 ohm’luk bir mikro\u015ferit \u00e7izgisi kulland\u0131m.<\/span><\/p>\n

1. \u00d6rnekleyici.<\/span>
\n<\/big><\/p>\n

\u015eema a\u015fa\u011f\u0131da solda, i\u00e7 g\u00f6r\u00fcn\u00fcm\u00fc ise sa\u011fda yer almaktad\u0131r.<\/span><\/small><\/big><\/p>\n

\"\" \"\"<\/p>\n

\u00d6rnekleyici, s\u0131radan \u00e7ift tarafl\u0131 Epoksi PCB \u00fczerine in\u015fa edilmi\u015ftir, bu nedenle 50 ohm mikro\u015ferit 2,8 mm geni\u015fli\u011findedir:\u00a0<\/span><\/p>\n

\u0130stenilen kuplaj katsay\u0131s\u0131na g\u00f6re R1, R2 ve R3 de\u011ferleri hesaplan\u0131r: -40 dB kuplaj elde etmek i\u00e7in R1=R2=R3= 820 ohm kullan\u0131ld\u0131.<\/span><\/p>\n

Bu diren\u00e7 her biri 0,25 W olarak derecelendirildi\u011finden, RF \u00f6rnekleme cihaz\u0131m\u0131 40 W’a kadar s\u00fcrekli vericilerle kullanabilirim. Daha y\u00fcksek bir g\u00fc\u00e7 s\u0131n\u0131r\u0131 (100 W) istiyorsan\u0131z, bu devreyi her biri 0,5 W olan 3 x 820 ohm ile olu\u015fturun.<\/span><\/p>\n

\u00d6rnekleyici “teneke Schubert kutusu” (37 x 55 x 30 mm) i\u00e7inde yer almaktad\u0131r.<\/span><\/p>\n

<\/center>2. \u00d6l\u00e7\u00fcmler.<\/span><\/big><\/p>\n

Bu tipte birka\u00e7 RF \u00f6rnekleme cihaz\u0131 yapt\u0131m ve tipik \u00f6zelliklerinin baz\u0131lar\u0131n\u0131 \u00f6l\u00e7t\u00fcm.<\/span><\/p>\n

Zay\u0131flama grafi\u011fi a\u015fa\u011f\u0131da g\u00f6sterilmi\u015ftir:<\/span><\/p>\n

\"\"<\/p>\n

Ve ana liman\u0131n SWR’si \u015fudur:<\/p>\n

\"\"<\/p>\n

W. Hayward’\u0131n \u00f6nerdi\u011fi gibi, R1’in \u00fczerine bir hileli kapasit\u00f6r koydum: R1 ve R2 g\u00f6vdeleri boyunca uzanan k\u00fc\u00e7\u00fck bir yal\u0131t\u0131ml\u0131 tel par\u00e7as\u0131ndan yap\u0131lm\u0131\u015f bu kapasit\u00f6r, bir A\u011f Analiz\u00f6r\u00fcnde SWR’yi izlerken ayarland\u0131. En sa\u011fdaki foto\u011fraftaki k\u0131rm\u0131z\u0131 teldir.<\/span><\/p>\n

Bu \u00e7izimler, bu RF \u00f6rnekleme cihaz\u0131n\u0131n 0,5 dB’den daha az bir hata ve <1,05’lik bir SWR ile 500 MHz’e kadar kullan\u0131labilece\u011fini g\u00f6stermektedir.<\/span><\/p>\n

Sonu\u00e7.<\/span><\/p>\n

<\/big>Basit ve ucuz olmas\u0131na ra\u011fmen, bu k\u00fc\u00e7\u00fck RF \u00f6rnekleme cihaz\u0131 \u00f6l\u00e7\u00fcm ekipman\u0131m i\u00e7in \u00e7ok kullan\u0131\u015fl\u0131 bir aksesuard\u0131r.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Bir RF \u00f6rnekleme cihaz\u0131, koaksiyel bir hatta yay\u0131lan RF sinyalinin d\u00fc\u015f\u00fck g\u00fc\u00e7 g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc sa\u011flar. Bir g\u00fc\u00e7 kayna\u011f\u0131 (verici veya amplifikat\u00f6r) ile sonland\u0131rma y\u00fck\u00fc aras\u0131na yerle\u015ftirilen […]<\/p>\n","protected":false},"author":1,"featured_media":165,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,3],"tags":[],"class_list":["post-164","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genel","category-hamrad"],"_links":{"self":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/posts\/164","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=164"}],"version-history":[{"count":0,"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/wp\/v2\/posts\/164\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=\/"}],"wp:attachment":[{"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ta9ea.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}