{"id":2945,"date":"2018-08-29T16:01:06","date_gmt":"2018-08-29T14:01:06","guid":{"rendered":"https:\/\/digitalyacht.fr\/blog\/?p=2945"},"modified":"2020-02-26T14:44:56","modified_gmt":"2020-02-26T13:44:56","slug":"vswr-vhf","status":"publish","type":"post","link":"https:\/\/digitalyacht.fr\/blog\/2018\/08\/vswr-vhf\/","title":{"rendered":"Explication du Taux d\u2019onde stationnaire (VSWR) d&rsquo;une antenne VHF"},"content":{"rendered":"<p><img  loading=\"lazy\"  decoding=\"async\"  class=\"aligncenter wp-image-2946 pk-lazyload\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"Alarme VSWR\"  width=\"601\"  height=\"474\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 601px) 100vw, 601px\"  data-pk-src=\"https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Alarm-NEW-with-Voltage.png\"  data-pk-srcset=\"https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Alarm-NEW-with-Voltage.png 802w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Alarm-NEW-with-Voltage-300x236.png 300w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Alarm-NEW-with-Voltage-768x605.png 768w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Alarm-NEW-with-Voltage-185x146.png 185w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Alarm-NEW-with-Voltage-50x39.png 50w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Alarm-NEW-with-Voltage-95x75.png 95w\" ><\/p>\n<h4 style=\"text-align: center;\"><\/h4>\n<h4 style=\"text-align: center;\"><strong>Fonctionnement d&rsquo;un transpondeur AIS<\/strong><\/h4>\n<p><a href=\"https:\/\/digitalyacht.fr\/categorie-produit\/systeme_ais\/transpondeurs-ais\/\">Les transpondeurs AIS <\/a>sont g\u00e9n\u00e9ralement des produits tr\u00e8s fiables qui peuvent fonctionner pendant de nombreuses ann\u00e9es, qui transmettent vos positions et qui re\u00e7oivent les cibles AIS (port\u00e9e d\u2019une antenne VHF).<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Il y a 3 choses qu\u2019un transpondeur AIS a besoin pour fonctionner correctement. Il suffit simplement de se rappeler de l\u2019abr\u00e9viation <strong>VGA<\/strong> qui signifie :<\/p>\n<p><strong>V = Volt pour la tension \u00e9lectrique<\/strong>, le transpondeur a besoin d\u2019une alimentation d&rsquo;environ 12v CC<\/p>\n<p><strong>G = GPS<\/strong>, le GPS du transpondeur doit bien recevoir la position<\/p>\n<p><strong>A = Antenne<\/strong>, l\u2019antenne AIS\/VHF doit \u00eatre de bonne condition et bien connect\u00e9e au transpondeur.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<h4 style=\"text-align: center;\"><strong>V\u00e9rification de la tension \u00e9lectrique<\/strong><\/h4>\n<p>La tension \u00e9lectrique peut \u00eatre v\u00e9rifi\u00e9e en utilisant un multim\u00e8tre (r\u00e9gler pour mesurer courant continu) sur le fil rouge et noir du transpondeur ou plus simplement en utilisant le logiciel proAIS2. Avec le logiciel, il faut aller dans l\u2019onglet diagnostique et voir la valeur affich\u00e9e en milieu de page (voir image ci-dessus).<span class=\"Apple-converted-space\">\u00a0Le transpondeur a besoin d\u2019une alimentation d&rsquo;environ 12v CC<\/span><\/p>\n<p>&nbsp;<\/p>\n<h4 style=\"text-align: center;\"><strong>V\u00e9rification de la r\u00e9ception GPS<\/strong><\/h4>\n<p>La r\u00e9ception GPS peut aussi \u00eatre v\u00e9rifi\u00e9e en utilisant proAIS2 puis en allant dans l\u2019onglet GNSS Statut. Dans cet onglet, vous pourrez voir un graphique qui vous montrera la qualit\u00e9 de la r\u00e9ception GPS (voir image ci-dessous ).<\/p>\n<p><img  loading=\"lazy\"  decoding=\"async\"  class=\"aligncenter wp-image-2947 pk-lazyload\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"R\u00e9ception de l&#039;antenne GPS\"  width=\"625\"  height=\"487\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 625px) 100vw, 625px\"  data-pk-src=\"https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/GPS-Status-3D-Fix-OK.png\"  data-pk-srcset=\"https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/GPS-Status-3D-Fix-OK.png 816w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/GPS-Status-3D-Fix-OK-300x234.png 300w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/GPS-Status-3D-Fix-OK-768x599.png 768w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/GPS-Status-3D-Fix-OK-187x146.png 187w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/GPS-Status-3D-Fix-OK-50x39.png 50w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/GPS-Status-3D-Fix-OK-96x75.png 96w\" ><\/p>\n<p>&nbsp;<\/p>\n<h4 style=\"text-align: center;\"><strong>V\u00e9rification de l&rsquo;antenne VHF<\/strong><\/h4>\n<p>V\u00e9rifier l\u2019antenne VHF\/AIS est la chose la plus difficile et nous recevons beaucoup d\u2019appels et d\u2019emails \u00e0 propos de sa, nous avons donc d\u00e9cid\u00e9 d\u2019\u00e9crire un article \u00e0 propos des antennes VHF et du taux d\u2019Onde stationnaire (VSWR en anglais).<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Bien qu\u2019une antenne VHF en t\u00eate de mat permette d\u2019obtenir de meilleures performances, c\u2019est aussi l\u2019endroit le plus hostile et les antennes sont mises \u00e0 rude \u00e9preuve et cela peut avoir un impact sur la r\u00e9ception\/transmission AIS.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Tous les <a href=\"https:\/\/digitalyacht.fr\/categorie-produit\/systeme_ais\/transpondeurs-ais\/\">transpondeurs AIS<\/a> font une s\u00e9rie de tests pour v\u00e9rifier l\u2019\u00e9tat du syst\u00e8me et lorsque vous installez un transpondeur AIS en utilisant votre antenne VHF existante, c\u2019est surement une des premi\u00e8res fois que votre antenne VHF sera test\u00e9e. Bien que vous receviez sur votre radio VHF ou syst\u00e8me AIS, votre transmission AIS sera surement faible due \u00e0 une antenne VHF d\u00e9grad\u00e9e ou vieillissante. Le mauvais \u00e9tat d\u2019une antenne VHF se v\u00e9rifie si le taux d\u2019Onde stationnaire est tr\u00e8s haut (VSWR).<span class=\"Apple-converted-space\">\u00a0 <\/span>Le VSWR d\u2019un transpondeur AIS se mesure avec le niveau d\u2019ondes stationnaires pr\u00e9sents dans le c\u00e2ble de l\u2019antenne. Les ondes stationnaires sont les signaux qui ne se r\u00e9pandent pas dans l\u2019air et l\u2019antenne mais directement dans le c\u00e2ble jusqu\u2019\u00e0 sa source (le transpondeur AIS).<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Dans un monde id\u00e9al, tous les signaux envoy\u00e9s \u00e0 l\u2019antenne seraient transmis aux autres navires \u00e0 travers l\u2019air, mais ceci est seulement possible si l\u2019imp\u00e9dance de la source, de l\u2019antenne et du c\u00e2ble sont identiques (50 ohms).<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p><img  loading=\"lazy\"  decoding=\"async\"  class=\"aligncenter wp-image-2948 pk-lazyload\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"Explication du du taux d\u2019Onde stationnaire \"  width=\"647\"  height=\"447\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 647px) 100vw, 647px\"  data-pk-src=\"https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2-1024x707.png\"  data-pk-srcset=\"https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2-1024x707.png 1024w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2-300x207.png 300w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2-768x530.png 768w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2-211x146.png 211w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2-50x35.png 50w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2-109x75.png 109w, https:\/\/digitalyacht.fr\/blog\/wp-content\/uploads\/2018\/08\/VSWR-Explained-2.png 1060w\" ><\/p>\n<p>&nbsp;<\/p>\n<h4 style=\"text-align: center;\"><strong>Le taux d\u2019onde stationnaire (VSWR)<\/strong><\/h4>\n<p>Si les imp\u00e9dances \u00e9taient parfaites alors le taux d\u2019onde stationnaire (VSWR) serait de 1:1. Cependant, dans le monde r\u00e9el, le taux le plus probable d\u2019\u00eatre obtenu est entre 1.1:1 et 2.5:1.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Dans l\u2019onglet diagnostique de proAIS2, le taux d\u2019onde stationnaire (VSWR) est affich\u00e9 et est mis \u00e0 jour \u00e0 chaque fois que le transpondeur AIS transmet. Lorsque le transpondeur AIS transmet alors vous verrez un petit changement dans les d\u00e9cimales du taux d\u2019onde stationnaire et ceci est normal. Cependant, si vous voyez un grand changement lorsque le transpondeur transmet, alors ceci signifie qu\u2019il y a un probl\u00e8me avec le c\u00e2ble de l\u2019antenne VHF.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n<p>Si la mesure du VSWR est au-dessus de 5:1, la led Status sera illumin\u00e9e en rouge.<\/p>\n<p>Comprendre l\u2019importance d\u2019une bonne antenne VHF avec un faible taux d\u2019onde stationnaire est important pour obtenir les meilleures performances possibles avec un transpondeur AIS.<\/p>\n<p>Nous esp\u00e9rons que cet article vous a \u00e9t\u00e9 utile pour mieux comprendre les antennes VHF et les <a href=\"https:\/\/digitalyacht.fr\/categorie-produit\/systeme_ais\/transpondeurs-ais\/\">transpondeurs AIS<\/a>.<span class=\"Apple-converted-space\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"Fonctionnement d&rsquo;un transpondeur AIS Les transpondeurs AIS sont g\u00e9n\u00e9ralement des produits tr\u00e8s fiables qui peuvent fonctionner pendant de&hellip;\n","protected":false},"author":2,"featured_media":2946,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":859,"csco_singular_sidebar":"","csco_page_header_type":"","csco_appearance_masonry":"","csco_page_load_nextpost":"","csco_post_subtitle":"","csco_post_video_location":[],"csco_post_video_location_hash":"","csco_post_video_url":"","csco_post_video_bg_start_time":0,"csco_post_video_bg_end_time":0,"footnotes":""},"categories":[271,2,270,278],"tags":[17,132,330,342,414,341,340],"class_list":{"0":"post-2945","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-ais","8":"category-news","9":"category-produit","10":"category-techniques","11":"tag-ais","12":"tag-antenne-vhf","13":"tag-proais","14":"tag-probleme-ais","15":"tag-taux-donde","16":"tag-taux-donde-stationnaire","17":"tag-vswr","18":"cs-entry","19":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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