{"id":4566,"date":"2025-02-26T18:49:43","date_gmt":"2025-02-26T17:49:43","guid":{"rendered":"https:\/\/www.f5nhj.fr\/?page_id=4566"},"modified":"2025-02-26T18:52:42","modified_gmt":"2025-02-26T17:52:42","slug":"w3dzz","status":"publish","type":"page","link":"https:\/\/www.f5nhj.fr\/?page_id=4566","title":{"rendered":"W3DZZ"},"content":{"rendered":"<div align=\"justify\"><\/div>\n<ul>\n<li>\n<div align=\"justify\">Les trappes sont constitu\u00e9es, d\u2019un circuit bouchon, c\u2019est \u00e0 dire un bobinage et d\u2019un condensateur mont\u00e9s en parall\u00e8le. Condensateurs de 60 \u00e0 62 pF 2 \u00e0 3000 v (suivant r\u00e9cup\u00e9ration dans vieux poste TV), le bobinage sera constitu\u00e9 de 13 tours (spires jointives) de fil \u00e9maill\u00e9 de 15\/10 bobin\u00e9s sur air avec un diam\u00e8tre de PVC 60 mm.<\/div>\n<div align=\"justify\">\u00a0\u00a0\u00a0&#8211; Sur 7 Mhz, la partie centrale se comporte comme un doublet classique.<\/div>\n<div align=\"justify\">\u00a0\u00a0\u00a0&#8211; Sur 3,5 Mhz, les trappes sont loin de leur fr\u00e9quence de r\u00e9sonnance<\/div>\n<div align=\"justify\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0et augmente artificiellement la longueur de l&rsquo;antenne, qui vibre encore en demi-onde.<\/div>\n<div align=\"justify\">\u00a0\u00a0\u00a0&#8211; Sur 14, 21 et 28 Mhz, l&rsquo;ensemble de l&rsquo;antenne vibre respectivement en 3, 5, et 7 demi-ondes.<\/div>\n<div align=\"justify\">En pratique on utilise g\u00e9n\u00e9ralement :<\/div>\n<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4570\" src=\"https:\/\/www.f5nhj.fr\/wp-content\/uploads\/2025\/02\/Capture-decran-2025-02-26-185008.png\" alt=\"\" width=\"606\" height=\"335\" srcset=\"https:\/\/www.f5nhj.fr\/wp-content\/uploads\/2025\/02\/Capture-decran-2025-02-26-185008.png 606w, https:\/\/www.f5nhj.fr\/wp-content\/uploads\/2025\/02\/Capture-decran-2025-02-26-185008-300x166.png 300w, https:\/\/www.f5nhj.fr\/wp-content\/uploads\/2025\/02\/Capture-decran-2025-02-26-185008-500x276.png 500w\" sizes=\"auto, (max-width: 606px) 100vw, 606px\" \/><\/p>\n<ul>\n<li>\n<div align=\"justify\">A = 6.77 m\u00b1 2 cm &lt;<b>Trappe<\/b>&gt; B = 10.06 m\u00b1 2 cm &#8211;\u00a0<b>Alim<\/b>\u00a0&#8211; B = 10.06 m\u00b1 2 cm &lt;<b>Trappe<\/b>&gt; A = 6.70\u00a0 7 m\u00b1 2 cm<\/div>\n<\/li>\n<li>Nous pouvons \u00e9galement utiliser simplement les valeurs B, sans les trappes&#8230; ni les longueurs A&#8230;<\/li>\n<li>Afin d&rsquo;augmenter la bande passante, on peut utiliser au lieu d&rsquo;un conducteur central, utiliser plusieurs conducteurs sur la p\u00e9riph\u00e9rie de la trappe, afin de r\u00e9aliser \u00ab\u00a0un rayonnemnt\u00a0\u00bb de tube \u00e9gal au diamt\u00e8tre de la trappe.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><b>Web..<\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les trappes sont constitu\u00e9es, d\u2019un circuit bouchon, c\u2019est \u00e0 dire un bobinage et d\u2019un condensateur mont\u00e9s en parall\u00e8le. Condensateurs de 60 \u00e0 62 pF 2 \u00e0 3000 v (suivant r\u00e9cup\u00e9ration dans vieux poste TV), le bobinage sera constitu\u00e9 de 13 &hellip; <a href=\"https:\/\/www.f5nhj.fr\/?page_id=4566\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3305,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-4566","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=\/wp\/v2\/pages\/4566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4566"}],"version-history":[{"count":2,"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=\/wp\/v2\/pages\/4566\/revisions"}],"predecessor-version":[{"id":4571,"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=\/wp\/v2\/pages\/4566\/revisions\/4571"}],"up":[{"embeddable":true,"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=\/wp\/v2\/pages\/3305"}],"wp:attachment":[{"href":"https:\/\/www.f5nhj.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}