{"id":1236,"date":"2021-02-12T15:30:24","date_gmt":"2021-02-12T14:30:24","guid":{"rendered":"http:\/\/f6kmf.fr\/?p=1236"},"modified":"2021-02-12T15:30:26","modified_gmt":"2021-02-12T14:30:26","slug":"construction-dune-antenne-colineaire-alimentee-en-j","status":"publish","type":"post","link":"https:\/\/f6kmf.fr\/index.php\/2021\/02\/12\/construction-dune-antenne-colineaire-alimentee-en-j\/","title":{"rendered":"Construction d&rsquo;une antenne colin\u00e9aire aliment\u00e9e en \u00ab\u00a0J\u00a0\u00bb"},"content":{"rendered":"\n<p style=\"text-align:right\"><strong>Par Pierre.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft\"><img loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"884\" src=\"https:\/\/f6kmf.fr\/wp-content\/uploads\/2021\/02\/image-2.png\" alt=\"\" class=\"wp-image-1237\"\/><\/figure><\/div>\n\n\n\n<p class=\"has-background has-very-light-gray-background-color\">Apr\u00e8s avoir r\u00e9alis\u00e9 une antenne J simple en 446 il y a plus de 6 mois, j&rsquo;ai d\u00e9cid\u00e9 de me lancer dans la r\u00e9alisation d&rsquo; une antenne colin\u00e9aire 446,1 Mhz aliment\u00e9e en \u00ab\u00a0J\u00a0\u00bb. R\u00e9gl\u00e9e au VNA, SWR- 1,05.<br><br>D\u00e8s que le temps le permettra, elle ira sur le toit, j&rsquo;esp\u00e8re que la spire ne servira pas de perchoir \u00e0 moineaux \ud83d\ude42<br><br>Pour la fabrication, on part d\u00e9j\u00e0 sur une antenne J simple, c&rsquo;est \u00e0 dire une demi-onde avec un 1\/4 onde d&rsquo;adaptation d&rsquo;imp\u00e9dance. Une fois le bon r\u00e9glage fait, on insert la boucle 1\/2 onde, puis le brin rayonnant sup\u00e9rieur. Un 2\u00e8me r\u00e9glage est \u00e0 faire pour ajuster le TOS et c&rsquo;est fini. <br><br><strong>Gain estim\u00e9 3 dBd<\/strong>. Un bon moyen pour doubler la puissance d&rsquo; \u00e9mission \/ r\u00e9ception sans consommation suppl\u00e9mentaire. C&rsquo;est \u00e9colo, \u00e9conomique et plaisant \u00e0 faire !!!<br><br>Antenne test\u00e9e dehors \u00e0 1,80m du sol, loin de toute source m\u00e9tallique.<br><br>R\u00e9alisation: Tube D10 mm, 2 x morceaux de tube D12 mm Lg 6cm, m\u00e9plat largeur 10 mm (pour la spire)<br>Entretoise d&rsquo;isolation r\u00e9alis\u00e9e par tournage en polyac\u00e9tal <br>Les tubes et m\u00e9plat ont \u00e9t\u00e9 trouv\u00e9s chez Bricoman.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"418\" height=\"897\" src=\"https:\/\/f6kmf.fr\/wp-content\/uploads\/2021\/02\/image-3.png\" alt=\"\" class=\"wp-image-1239\" srcset=\"https:\/\/f6kmf.fr\/wp-content\/uploads\/2021\/02\/image-3.png 418w, https:\/\/f6kmf.fr\/wp-content\/uploads\/2021\/02\/image-3-140x300.png 140w\" sizes=\"auto, (max-width: 418px) 100vw, 418px\" \/><figcaption> <br><strong>&#8211;\u00a0D\u00e9tail embase J\u00a0<\/strong><br>(j&rsquo;ai fix\u00e9 la SMA Fem sur un morceau de PE r\u00e9cup\u00e9r\u00e9 sur un cintre \u00e0 pantalon) et 2 colliers inox D10\/12 pour fixer le tout sur les 2 tubes D10 mm.<br>\u00a0 Pour la base du J, j&rsquo;ai utilis\u00e9 pour simplifier la r\u00e9alisation une pi\u00e8ce en aluminium trouv\u00e9e sur Aliexpress servant \u00e0 l&rsquo;origine \u00e0 fixer les c\u00e2bles \u00e0 bougies HT sur les voitures. <br>Pile l&rsquo;\u00e9cartement de 30 mm que je voulais !!<br>\u00a0 >\u00a0TRIPLE AVANTAGE , simplifie le travail de r\u00e9alisation, d&rsquo;ajustement du TOS et\u00a0donne de la rigidit\u00e9 pour la t\u00eate du J. <\/figcaption><\/figure><\/div>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"759\" height=\"588\" src=\"https:\/\/f6kmf.fr\/wp-content\/uploads\/2021\/02\/image-4.png\" alt=\"\" class=\"wp-image-1240\" srcset=\"https:\/\/f6kmf.fr\/wp-content\/uploads\/2021\/02\/image-4.png 759w, https:\/\/f6kmf.fr\/wp-content\/uploads\/2021\/02\/image-4-300x232.png 300w\" sizes=\"auto, (max-width: 759px) 100vw, 759px\" \/><figcaption> <br><strong>D\u00e9tail de la spire<\/strong>\u00a01\/2 onde avant fixation finale. La spire est tenue par 2 vis Inox \u00a0M4x12. <\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Par Pierre. Apr\u00e8s avoir r\u00e9alis\u00e9 une antenne J simple en 446 il y a plus de 6 mois, j&rsquo;ai d\u00e9cid\u00e9<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[11,21,14],"tags":[],"class_list":["post-1236","post","type-post","status-publish","format-standard","hentry","category-activites-radio","category-antenne","category-realisations"],"_links":{"self":[{"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/posts\/1236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/comments?post=1236"}],"version-history":[{"count":2,"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/posts\/1236\/revisions"}],"predecessor-version":[{"id":1241,"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/posts\/1236\/revisions\/1241"}],"wp:attachment":[{"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/media?parent=1236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/categories?post=1236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/f6kmf.fr\/index.php\/wp-json\/wp\/v2\/tags?post=1236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}