{"id":3070,"date":"2018-12-01T23:39:13","date_gmt":"2018-12-01T23:39:13","guid":{"rendered":"https:\/\/ct1jqj.eu\/?p=3070"},"modified":"2018-12-01T23:39:13","modified_gmt":"2018-12-01T23:39:13","slug":"balun-41","status":"publish","type":"post","link":"https:\/\/ct1jqj.eu\/?p=3070","title":{"rendered":"Balun 4:1 &#8211; N\u00facleo de ar"},"content":{"rendered":"<div class=\"pld-like-dislike-wrap pld-template-4\">\r\n    <div class=\"pld-like-wrap  pld-common-wrap\">\r\n    <a href=\"javascript:void(0)\" class=\"pld-like-trigger pld-like-dislike-trigger  \" title=\"\" data-post-id=\"3070\" data-trigger-type=\"like\" data-restriction=\"cookie\" data-already-liked=\"0\">\r\n                        <i class=\"far fa-smile\"><\/i>\r\n                    <\/a>\r\n    <span class=\"pld-like-count-wrap pld-count-wrap\">    <\/span>\r\n<\/div><div class=\"pld-dislike-wrap  pld-common-wrap\">\r\n    <a href=\"javascript:void(0)\" class=\"pld-dislike-trigger pld-like-dislike-trigger  \" title=\"\" data-post-id=\"3070\" data-trigger-type=\"dislike\" data-restriction=\"cookie\" data-already-liked=\"0\">\r\n                        <i class=\"far fa-frown\"><\/i>\r\n                    <\/a>\r\n    <span class=\"pld-dislike-count-wrap pld-count-wrap\"><\/span>\r\n<\/div><\/div><p style=\"text-align: justify;\">E como tinha de come\u00e7ar por algum lado ap\u00f3s ter aberto o ba\u00fa, decidi come\u00e7ar por este artigo:<\/p>\n<p style=\"text-align: justify;\">Data original de publica\u00e7\u00e3o: 20\/07\/2007\u00a0<em>(Projecto original de PA3CNJ)<\/em><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #808080;\">Este balun foi testado e medido com um medidor MFJ 269 e apresentou uma boa SWR entre os 11m e os 30m, com a ajuda dum <i>antenna tuner<\/i> faz os 10 e os 40m. Medidas realizadas, usando \u00e1 entrada uma resist\u00eancia de 200\u03a9, de seguida as tabelas com as medi\u00e7\u00f5es que se realizaram:<\/span><\/p>\n\n\t\t<style>\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-3070 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=4063'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/12\/balu41-1-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p align=\"justify\"><span style=\"color: #808080;\">Material utilizado:<\/span><\/p>\n<ul>\n<li>\n<p align=\"justify\"><span style=\"color: #808080;\">Um peda\u00e7o de tubo de PVC \u00d8 40, com 11cm<\/span><\/p>\n<\/li>\n<li>\n<p align=\"justify\"><span style=\"color: #808080;\">2 tampas em PVC para tubo \u00d8 40<\/span><\/p>\n<\/li>\n<li>\n<p align=\"justify\"><span style=\"color: #808080;\">2 parafusos em inox M5x25<\/span><\/p>\n<\/li>\n<li>\n<p align=\"justify\"><span style=\"color: #808080;\">4 anilhas em inox M5<\/span><\/p>\n<\/li>\n<li>\n<p align=\"justify\"><span style=\"color: #808080;\">2 porcas M5<\/span><\/p>\n<\/li>\n<li>\n<p align=\"justify\"><span style=\"color: #808080;\">4m de fio 1mm preto ou cabo bifilar de altifante 2 x 1mm<\/span><\/p>\n<\/li>\n<li>\n<p align=\"justify\"><span style=\"color: #808080;\">2 terminais furo \u00d86<\/span><\/p>\n<\/li>\n<\/ul>\n<p align=\"justify\"><span style=\"color: #808080;\">Como fazer:<\/span><\/p>\n<p align=\"justify\"><span style=\"color: #808080;\">A cerca de 3cm das extremidades dos tubos fazem-se 2 furos seguidos de \u00d83mm e posteriormente ap\u00f3s a passagem dos fios, enrolam-se 8 espiras (usando o cabo bifilar ou 2 fios ao lado um do outro). De seguida unem-se os terminais A com D e estes \u00e1 massa do coaxial ou ficha utilizada, o terminal B ser\u00e1 um dos pontos de entrada da antena, e ser\u00e1 ligado um outro ponto de entrada de antena ao terminal C, que ligar\u00e1 por sua vez ao vivo do coaxial ou da ficha utilizada. Ap\u00f3s as liga\u00e7\u00f5es, furam-se as tampas para passagem dos cabos (No meu caso usei parafusos, com a seguinte ordem: terminal, anilha, passagem pela tampa, anilha e porca bem apertada&#8230;) Quando as tampas forem colocadas dever\u00e1 ser utilizado um pouco de cola para garantir que o balun fica selado, no meu caso usei tamb\u00e9m fita isoladora sobre as espiras enroladas em v\u00e1rias voltas para garantir o isolamento. Ah, n\u00e3o esquecer de colocar cola ap\u00f3s a entrada dos cabos no tubo para tapar eventuais entradas de \u00e1gua. Em baixo as fotografias do projecto (S\u00e3o de baixa resolu\u00e7\u00e3o, poderei ver se encontro as originais com mais resolu\u00e7\u00e3o!)<\/span><\/p>\n\n\t\t<style>\n\t\t\t#gallery-2 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-2 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-2 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-2 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-2' class='gallery galleryid-3070 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=4064'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/12\/S6000437-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=4065'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/12\/S6000449-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=4066'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/12\/S6000454-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<p><span style=\"color: #808080;\">Para finalizar um desenho, retirado do site original (Que n\u00e3o consigo encontrar!) e que talvez ajude:<\/span><\/p>\n\n\t\t<style>\n\t\t\t#gallery-3 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-3 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-3 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-3 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-3' class='gallery galleryid-3070 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=4067'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/12\/construction-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p>At\u00e9 ao pr\u00f3ximo &#8220;Do fundo do ba\u00fa&#8221;!<\/p>\n<p>73&#8217;s<\/p>\n","protected":false},"excerpt":{"rendered":"<p>E como tinha de come\u00e7ar por algum lado ap\u00f3s ter aberto o ba\u00fa, decidi come\u00e7ar por este artigo: Data original de publica\u00e7\u00e3o: 20\/07\/2007\u00a0(Projecto original de PA3CNJ) Este balun foi testado e medido com um medidor MFJ 269 e apresentou uma boa SWR entre os 11m e os 30m, com a ajuda dum antenna tuner faz [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[93,230],"class_list":["post-3070","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fundo-do-bau","tag-balun-41","tag-mfj-269"],"_links":{"self":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts\/3070","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3070"}],"version-history":[{"count":0,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts\/3070\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/media\/4346"}],"wp:attachment":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3070"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3070"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3070"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}