{"id":27,"date":"2008-11-24T14:24:19","date_gmt":"2008-11-24T13:24:19","guid":{"rendered":"http:\/\/blog.mhzshop.com\/?p=27"},"modified":"2018-02-28T12:53:38","modified_gmt":"2018-02-28T11:53:38","slug":"quelle-est-la-portee-d-une-antenne","status":"publish","type":"post","link":"https:\/\/www.mhzshop.com\/blog\/nouveautes\/quelle-est-la-portee-d-une-antenne-27","title":{"rendered":"Quelle est la port\u00e9e d\u2019une antenne ? Fantasmes et marketing"},"content":{"rendered":"

Nombreux sont les clients nous posant la fatidique question \u00e0 propos d\u2019une antenne : \u00ab Quelle est la port\u00e9e de cette antenne ? \u00bb. Et nous nous voyons \u00e0 chaque fois contraints de les d\u00e9cevoir en r\u00e9pondant qu\u2019il est impossible de r\u00e9pondre sans plus de donn\u00e9es.\u00a0 En voici l\u2019explication avec des termes que j’esp\u00e8re compr\u00e9hensibles, au d\u00e9triment de l’exactitude technique (que les puristes me pardonnent).<\/p>\n

La port\u00e9e d\u2019une antenne d\u00e9pend de son gain, mais \u00e9galement de la puissance du mat\u00e9riel (antenne + carte) qui se trouve en face (sans parler des bruits de l\u2019environnement, des obstacles, des longueurs de c\u00e2bles ou encore de la sensibilit\u00e9 de la carte utilis\u00e9e). Prenons un exemple :<\/p>\n

\"Illustration
\nNous retrouvons notre client qui, ayant voulu mettre toutes les chances de son c\u00f4t\u00e9, s\u2019est \u00e9quip\u00e9 d\u2019une antenne dont le gain est de 19 dBi. A 1 kilom\u00e8tre se trouvent un hotspot (type Neuf-WiFi) et une habitation \u00e9quip\u00e9e d\u2019une box WiFi (type Livebox ou Neufbox). Les donn\u00e9es doivent pouvoir circuler dans les deux sens (contrairement \u00e0 la t\u00e9l\u00e9vision),\u00a0 ce qui implique que les 2 points soient \u00e0 port\u00e9e l\u2019un de l\u2019autre. Ainsi, \u00e0 1km, notre client pourra se connecter au hotspot car les mat\u00e9riels de part et d\u2019autre\u00a0 sont \u00ab \u00e9quilibr\u00e9s \u00bb. En revanche, l’antenne et l’emplacement de la box ne lui permettent pas de couvrir une distance importante, et dans ce cas il sera impossible de se connecter \u00e0 ce signal. Si notre client se rapproche de la maison \u00e0 50m, il pourra alors\u00a0 se connecter. Nous avons donc pour cet exemple 2 port\u00e9es possibles pour la m\u00eame antenne : 1km pour se connecter au hotspot, et 50m pour se connecter \u00e0 une box plac\u00e9e dans une habitation.
\nEn conclusion, il est impossible de r\u00e9pondre \u00e0 cette question si tous les param\u00e8tres ne sont pas d\u00e9finis. Vous me r\u00e9pondrez que la plupart des fabricants de mat\u00e9riel WiFi indiquent des port\u00e9es sur leurs produits, mais ce n\u2019est que pur marketing pour justement r\u00e9pondre facilement \u00e0 la question fatidique et donc faciliter la vente. Chez MHz Shop, nous pr\u00e9f\u00e9rons offrir un vrai conseil technique, quitte \u00e0 briser le fantasme d\u2019une super antenne qui permet la connexion \u00e0 tous les r\u00e9seaux de la ville.<\/p>\n

P.S.: Installer un lapin dans le champ des antennes n’am\u00e9liore pas leurs performances.<\/p>\n","protected":false},"excerpt":{"rendered":"

Nombreux sont les clients nous posant la fatidique question \u00e0 propos d\u2019une antenne : \u00ab Quelle est la port\u00e9e de cette antenne ? \u00bb. Et nous nous voyons \u00e0 chaque fois contraints de les d\u00e9cevoir en r\u00e9pondant qu\u2019il est impossible de r\u00e9pondre sans plus de donn\u00e9es.\u00a0 En voici l\u2019explication avec […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[6],"tags":[],"yoast_head":"\nQuelle est la port\u00e9e d\u2019une antenne ? 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