{"id":337,"date":"2023-05-12T13:55:56","date_gmt":"2023-05-12T11:55:56","guid":{"rendered":"http:\/\/fra1od.freeboxos.fr\/wordpress\/?p=337"},"modified":"2023-05-30T13:35:16","modified_gmt":"2023-05-30T11:35:16","slug":"antenne-dipole-a-induction-lineaire","status":"publish","type":"post","link":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/2023\/05\/12\/antenne-dipole-a-induction-lineaire\/","title":{"rendered":"Antenne Dip\u00f4le \u00e0 induction lin\u00e9aire"},"content":{"rendered":"\n<p>L&rsquo;antenne HF pour espace r\u00e9duit raccourcie par induction lin\u00e9aire.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/antenne-hf-pour-espace-reduit-640w.gif\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"400\" data-attachment-id=\"338\" data-permalink=\"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/2023\/05\/12\/antenne-dipole-a-induction-lineaire\/antenne-hf-pour-espace-reduit-640w\/#main\" data-orig-file=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/antenne-hf-pour-espace-reduit-640w.gif?fit=640%2C400&amp;ssl=1\" data-orig-size=\"640,400\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"antenne-hf-pour-espace-reduit-640w\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/antenne-hf-pour-espace-reduit-640w.gif?fit=640%2C400&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/antenne-hf-pour-espace-reduit-640w.gif?resize=640%2C400\" alt=\"\" class=\"wp-image-338\"\/><\/a><\/figure>\n\n\n\n<p>Cette antenne dip\u00f4le est simplement repli\u00e9e sur elle-m\u00eame pour introduire une <em>inductance lin\u00e9aire<\/em> qui augmentera \u00e9lectroniquement sa taille physiquement r\u00e9duite <em>\u00e0 une fr\u00e9quence de r\u00e9sonance donn\u00e9e<\/em>. Ce moyen d&rsquo;obtenir de l&rsquo;inductance est beaucoup plus efficace (consid\u00e9rablement moins de pertes d&rsquo;\u00e9nergie RF) que des bobines d&rsquo;induction.<br><br>L&rsquo;inductance lin\u00e9aire, de cette antenne pour espace r\u00e9duit, n&rsquo;occasionne \u00e0 peu pr\u00e8s pas de pertes RF. Autrement dit, elle permet au radioamateur qui l&#8217;emploie d&rsquo;<em>entendre<\/em> les stations qui r\u00e9pondent \u00e0 son appel! C&rsquo;est une caract\u00e9ristique qui la rend <em>nettement avantageuse<\/em> &#8211; comparativement \u00e0 d&rsquo;autres antennes HF raccourcies.<br><br>L&rsquo;antenne \u00e0 <em>induction lin\u00e9aire<\/em>, pr\u00e9sente les caract\u00e9ristiques suivantes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Elle est de <strong>25% \u00e0 30%<\/strong> plus petite (plus courte) qu&rsquo;une antenne demi-longueur d&rsquo;onde de type dip\u00f4le, pleine longueur &#8211; pour une m\u00eame fr\u00e9quence de r\u00e9sonance.<br><\/li>\n\n\n\n<li>Son imp\u00e9dance sera typiquement d&rsquo;environ 35 ohms.<br><\/li>\n\n\n\n<li>Cette antenne peut \u00eatre aliment\u00e9e par un c\u00e2ble coaxial de 50 ohms via un isolateur central. Pour ceux qui choisiront d&rsquo;utiliser un autotransformateur (balun) 1:1, sachez qu&rsquo;il sera inutile, puisque l&rsquo;imp\u00e9dance typique de l&rsquo;antenne et celle du c\u00e2ble coaxial sont diff\u00e9rentes soit 0,7:1 ou, si vous pr\u00e9f\u00e9rez, 1:1,43!<br><\/li>\n\n\n\n<li>Vous aurez \u00e0 utiliser un transformateur d&rsquo;imp\u00e9dance (tuner) avec cette antenne. Gr\u00e2ce au transfo, il vous sera \u00e9galement possible d&rsquo;utiliser cette antenne sur des multiples impairs de sa fr\u00e9quence de r\u00e9sonance.<br><br>Prenez l&rsquo;exemple d&rsquo;une antenne HF pour espace r\u00e9duit (raccourcie par induction lin\u00e9aire) r\u00e9sonnante sur 80 m\u00e8tres. Vous pourrez \u00e9galement utiliser cette m\u00eame antenne sur 30 m\u00e8tres, 17 m\u00e8tres et 12 m\u00e8tres. Voici ma r\u00e9alisation, j&rsquo;utilise mon balcon comme r\u00e9flecteur de mon dip\u00f4le en alu. Avec dans mon bo\u00eetier un UnUn de 1:1.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" data-attachment-id=\"340\" data-permalink=\"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/2023\/05\/12\/antenne-dipole-a-induction-lineaire\/img_20230408_174359\/#main\" data-orig-file=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg?fit=1920%2C2560&amp;ssl=1\" data-orig-size=\"1920,2560\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.79&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;M2012K11AG&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1680975841&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.74&quot;,&quot;iso&quot;:&quot;50&quot;,&quot;shutter_speed&quot;:&quot;0.002029229&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"IMG_20230408_174359\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg?fit=768%2C1024&amp;ssl=1\" data-id=\"340\" src=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359.jpg?resize=768%2C1024\" alt=\"\" class=\"wp-image-340\" srcset=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg?resize=768%2C1024&amp;ssl=1 768w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg?resize=225%2C300&amp;ssl=1 225w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg?resize=1152%2C1536&amp;ssl=1 1152w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg?resize=1536%2C2048&amp;ssl=1 1536w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174359-scaled.jpg?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-attachment-id=\"339\" data-permalink=\"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/2023\/05\/12\/antenne-dipole-a-induction-lineaire\/img_20230408_174411\/#main\" data-orig-file=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?fit=2560%2C1920&amp;ssl=1\" data-orig-size=\"2560,1920\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.79&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;M2012K11AG&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;1680975853&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;4.74&quot;,&quot;iso&quot;:&quot;50&quot;,&quot;shutter_speed&quot;:&quot;0.002647684&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"IMG_20230408_174411\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?fit=1024%2C768&amp;ssl=1\" data-id=\"339\" src=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411.jpg?resize=1024%2C768\" alt=\"\" class=\"wp-image-339\" srcset=\"https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?resize=1024%2C768&amp;ssl=1 1024w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?resize=1536%2C1152&amp;ssl=1 1536w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?resize=2048%2C1536&amp;ssl=1 2048w, https:\/\/i0.wp.com\/fra1od.freeboxos.fr\/wordpress\/wp-content\/uploads\/2023\/05\/IMG_20230408_174411-scaled.jpg?w=2400 2400w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;antenne HF pour espace r\u00e9duit raccourcie par induction lin\u00e9aire. Cette antenne dip\u00f4le est simplement repli\u00e9e sur elle-m\u00eame pour introduire une inductance lin\u00e9aire qui augmentera \u00e9lectroniquement sa taille physiquement r\u00e9duite \u00e0 une fr\u00e9quence de r\u00e9sonance donn\u00e9e. Ce moyen d&rsquo;obtenir de l&rsquo;inductance est beaucoup plus efficace (consid\u00e9rablement moins de pertes d&rsquo;\u00e9nergie RF) que des bobines d&rsquo;induction. L&rsquo;inductance &#8230; <a title=\"Antenne Dip\u00f4le \u00e0 induction lin\u00e9aire\" class=\"read-more\" href=\"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/2023\/05\/12\/antenne-dipole-a-induction-lineaire\/\" aria-label=\"En savoir plus sur Antenne Dip\u00f4le \u00e0 induction lin\u00e9aire\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-337","post","type-post","status-publish","format-standard","hentry","category-antenne"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=337"}],"version-history":[{"count":1,"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions"}],"predecessor-version":[{"id":341,"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/337\/revisions\/341"}],"wp:attachment":[{"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fra1od.freeboxos.fr\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}