{"id":40,"date":"2025-10-31T16:17:33","date_gmt":"2025-10-31T15:17:33","guid":{"rendered":"http:\/\/vps-c83c33c3.vps.ovh.net\/?p=40"},"modified":"2026-01-18T16:26:46","modified_gmt":"2026-01-18T15:26:46","slug":"verif-cable-vhf","status":"publish","type":"post","link":"https:\/\/www.autonomade.fr\/index.php\/2025\/10\/31\/verif-cable-vhf\/","title":{"rendered":"V\u00e9rification d&rsquo;un c\u00e2ble d&rsquo;antenne VHF\/UHF"},"content":{"rendered":"\n<p>Dans une installation correcte d\u2019<strong>antenne VHF avec embase magn\u00e9tique<\/strong>&nbsp;et&nbsp;<strong>c\u00e2ble coaxial<\/strong>, la r\u00e9sistance \u00e9lectrique mesur\u00e9e entre :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>la masse de l\u2019embase (partie m\u00e9tallique en contact avec la carrosserie)<\/strong><\/li>\n<\/ul>\n\n\n\n<p>et<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>la masse de la prise coaxiale (ext\u00e9rieur du connecteur PL ou BNC, par exemple)<\/strong><\/li>\n<\/ul>\n\n\n\n<p>&#8230; doit \u00eatre&nbsp;<strong>tr\u00e8s proche de 0 ohm<\/strong>, typiquement&nbsp;<strong>moins de 1 ohm<\/strong>, souvent&nbsp;<strong>0,2 \u00e0 0,5 ohm<\/strong>&nbsp;(selon la qualit\u00e9 du multim\u00e8tre et de ses pointes de test).<\/p>\n\n\n\n<p>En r\u00e9sum\u00e9 :<br><strong>\u2248 0 \u2013 0,5 ohm: <\/strong>Connexion correcte (masse continue entre embase et prise<br><strong>&gt; 1 ohm: <\/strong>Mauvais contact, c\u00e2ble ab\u00eem\u00e9, oxydation, faux contact dans la fiche<br><strong>Infini \/ OL: <\/strong>Rupture de masse, c\u00e2ble coup\u00e9, connecteur mal soud\u00e9 ou sale<\/p>\n\n\n\n<p>Bonnes pratiques pour la mesure :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Utilise un&nbsp;<strong>multim\u00e8tre num\u00e9rique<\/strong>&nbsp;en mode \u00ab\u00a0ohmm\u00e8tre\u00a0\u00bb<\/li>\n\n\n\n<li>Fais bien contact avec les parties m\u00e9talliques (gratte si oxyd\u00e9)<\/li>\n\n\n\n<li>Mesure sans alimenter l\u2019\u00e9quipement (radio \u00e9teinte)<\/li>\n<\/ul>\n\n\n\n<p>Dans le d\u00e9tail, voici comment v\u00e9rifier la continuit\u00e9 et l\u2019\u00e9tat de ton c\u00e2ble coaxial pour ton antenne VHF, et aussi comment d\u00e9tecter un probl\u00e8me d\u2019ondes r\u00e9fl\u00e9chies (SWR \u00e9lev\u00e9) c&rsquo;est \u00e0 dire mauvaise qualit\u00e9 du signal \/ mauvaise r\u00e9ception et \u00c9mission.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. V\u00e9rification de la continuit\u00e9 \u00e9lectrique du c\u00e2ble coaxial<\/strong><\/h3>\n\n\n\n<p>Ce qu\u2019il faut mesurer avec un multim\u00e8tre :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuit\u00e9 entre \u00e2me (centre) de la prise et \u00e2me de l&#8217;embase: R\u00e9sistance proche de 0 \u03a9<\/li>\n\n\n\n<li>Continuit\u00e9 entre masse (blindage) de la prise et masse de l&#8217;embase magn\u00e9tique: R\u00e9sistance proche de 0 \u03a9<\/li>\n\n\n\n<li>V\u00e9rification d&rsquo;absence de contact entre \u00e2me et masse \u00e0 chaque extr\u00e9mit\u00e9: R\u00e9sistance infinie (ou OL)<\/li>\n<\/ul>\n\n\n\n<p>\u00c9tapes :<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Coupe l\u2019alimentation<\/strong>&nbsp;de la radio.<\/li>\n\n\n\n<li>Mets ton multim\u00e8tre en mode ohmm\u00e8tre.<\/li>\n\n\n\n<li>Mesure la r\u00e9sistance entre la&nbsp;<strong>tresse (masse)<\/strong>&nbsp;du connecteur \u00e0 une extr\u00e9mit\u00e9 et la partie m\u00e9tallique de l\u2019embase magn\u00e9tique (celle qui est en contact avec la carrosserie). R\u00e9sistance &lt; 1 \u03a9 = OK.<\/li>\n\n\n\n<li>Mesure la r\u00e9sistance entre l\u2019<strong>\u00e2me (conducteur central)<\/strong>&nbsp;du connecteur \u00e0 une extr\u00e9mit\u00e9 et le conducteur central \u00e0 l\u2019autre extr\u00e9mit\u00e9 (sur l\u2019embase si possible ou \u00e0 l\u2019autre connecteur). R\u00e9sistance tr\u00e8s faible = OK.<\/li>\n\n\n\n<li>Assure-toi qu\u2019il n\u2019y a&nbsp;<strong>pas de court-circuit<\/strong>&nbsp;entre \u00e2me et masse aux deux extr\u00e9mit\u00e9s.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Tester le c\u00e2ble en conditions r\u00e9elles (SWR &#8211; Rapport d\u2019ondes stationnaires)<\/strong><\/h3>\n\n\n\n<p>Pourquoi ?<br>Un c\u00e2ble d\u00e9fectueux, mal blind\u00e9 ou une mauvaise connexion provoquent un&nbsp;<strong>SWR \u00e9lev\u00e9<\/strong>, ce qui signifie que beaucoup d\u2019\u00e9nergie est renvoy\u00e9e vers l\u2019\u00e9metteur. Cela peut endommager la radio ou diminuer la port\u00e9e.<\/p>\n\n\n\n<p>Comment faire ?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Utilise un&nbsp;<strong>analyseur d\u2019antenne<\/strong>&nbsp;ou un&nbsp;<strong>rosm\u00e8tre (SWR meter)<\/strong>&nbsp;branch\u00e9 entre ta radio et le c\u00e2ble + antenne.<\/li>\n\n\n\n<li>Mesure le SWR \u00e0 la fr\u00e9quence VHF utilis\u00e9e (ex : 145 MHz).<\/li>\n\n\n\n<li>Un bon c\u00e2ble + antenne bien accord\u00e9e affiche un SWR proche de 1:1 (parfois jusqu\u2019\u00e0 1.5:1 est acceptable).<\/li>\n\n\n\n<li>Si le SWR d\u00e9passe 2:1, il y a un probl\u00e8me (c\u00e2ble, connecteur, antenne mal positionn\u00e9e).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Autres conseils<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>V\u00e9rifie la fixation de l\u2019embase magn\u00e9tique : doit \u00eatre propre, d\u00e9graiss\u00e9e et bien coll\u00e9e sur une surface m\u00e9tallique pour assurer une bonne masse.<\/li>\n\n\n\n<li>Si possible, utilise un c\u00e2ble coaxial de qualit\u00e9 (RG58, RG213, ou mieux selon la longueur).<\/li>\n\n\n\n<li>V\u00e9rifie les connecteurs : soudure propre, pas d\u2019oxydation, bon serrage.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">En r\u00e9sum\u00e9<\/h3>\n\n\n\n<p>Le bon \u00e9tat du c\u00e2ble coaxial de votre antenne est essentiel pour garantir un fonctionnement fiable de votre installation radio. Un c\u00e2ble d\u00e9grad\u00e9, mal blind\u00e9 ou mal raccord\u00e9 peut non seulement limiter la port\u00e9e de communication, mais aussi endommager votre \u00e9metteur (un \u00e9metteur ne dois jamais \u00e9mettre sans antenne, sinon cela grille les composant de l&rsquo;ampli de puissance, demandez moi comment je sais cela \ud83d\ude42<\/p>\n\n\n\n<p>Sur nos v\u00e9hicules de voyage, le cable subit de nombreuses contraintes et peu s\u2019ab\u00eemer sans qu&rsquo;on ne s&rsquo;en rende compte.<\/p>\n\n\n\n<p>Si vous avez des doutes ou des difficult\u00e9s dans l\u2019interpr\u00e9tation des mesures ou la mise en \u0153uvre des tests, je suis \u00e0 votre disposition pour vous accompagner et vous conseiller. <strong>N\u2019h\u00e9sitez pas \u00e0 me contacter<\/strong>, je serai ravi de vous aider \u00e0 diagnostiquer et \u00e0 optimiser votre installation radio.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.autonomade.fr\/index.php\/contact\/\">CONTACT<\/a><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>Vous souhaitez optimiser la performance de votre antenne VHF\/UHF ? D\u00e9couvrez comment v\u00e9rifier la continuit\u00e9 de votre c\u00e2ble coaxial et assurer une connexion parfaite. Un bon contact est essentiel pour \u00e9viter les probl\u00e8mes de r\u00e9ception et d&rsquo;\u00e9mission. Apprenez \u00e0 mesurer la r\u00e9sistance \u00e9lectrique et \u00e0 tester votre installation en conditions r\u00e9elles avec un analyseur d\u2019antenne. Ne laissez pas un c\u00e2ble d\u00e9fectueux compromettre votre exp\u00e9rience radio ! Suivez nos conseils pratiques pour garantir une installation fiable et performante. Plongez dans notre guide d\u00e9taill\u00e9 pour ma\u00eetriser chaque \u00e9tape de la v\u00e9rification de votre syst\u00e8me d&rsquo;antenne.<\/p>\n","protected":false},"author":1,"featured_media":273,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[11,12],"class_list":["post-40","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technique","tag-communication","tag-vhf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>V\u00e9rification d&#039;un c\u00e2ble d&#039;antenne VHF\/UHF - Autonomade<\/title>\n<meta name=\"description\" content=\"V\u00e9rifiez votre c\u00e2ble d&#039;antenne VHF : m\u00e9thode simple au multim\u00e8tre pour le tester. 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