Communication PMR446

Communication PMR446

Communication PMR446, détails

Avant d'utiliser un talkie-walkie PMR 446, il est nécessaire de veiller à ce qu’il soit homologué ans le pays d'utilisation prévue, sinon utiliser la PMR446 pourrait provoquer des interférences avec d'autres utilisateurs et enfreindre la loi.
Pour vérifier les dernières règlementations concernant l'utilisation de PMR446 et voir les changements apportés par les pays membres de la CEPT dans l'application des décisions, visitez le site Web du Bureau européen des radiocommunications.

Fréquences PMR446


Il y a un total de huit canaux ou fréquences qui peuvent être utilisées. Celles-ci sont espacées de 12,5 kHz les unes des autres. Comme son nom le suggère, les fréquences PMR446 se trouvent dans la partie hyperfréquences du spectre des fréquences radioélectriques et situés autour de 446 MHz.
Les fréquences PMR446 ont été harmonisées (mais pas nécessairement autorisé) pour une utilisation dans toute l'Europe. Les fréquences centrales des canaux sont les suivantes:

Canal PMR466

Fréquence (MHz)

1

446.00625

2

446.01875

3

446.03125

4

446.04375

5

446.05625

6

446.06875

7

446.08125

8

446.09375


Interférences


Les fréquences PMR446 sont partagées et les utilisateurs peuvent subir des interférences et des problèmes de partage de canal dans des zones tels que les zones densément peuplées dans les villes où l'utilisation de la radio est élevée.


Les problèmes associés à des sur utilisations des canaux peuvent contournés en modifiant la fréquence centrale. D'autres systèmes tels que CTCSS et codes DCS peuvent aider.


Étant donné que la PMR446 est une radio sans licence, et que les canaux peuvent se trouver encombrés. Ce mode de transmission n’est pas adapté pour les applications critiques là où la sécurité ou la vie des utilisateurs sont en jeu.

Les fréquences PMR446 dans le monde


La PMR446 est avant tout un système européen. Les fréquences sont harmonisées dans toute l'Europe et même au sein de l'UE, bien que tous les États membres n’ai pas autorisé le système. En dehors de l'Union européenne, ces fréquences sont susceptibles d'être affectés à d'autres usages. Par exemple aux États-Unis, les fréquences PMR446 sont attribuées à la radio amateur. Par conséquent, les radios PMR446 ne peuvent être utilisés aux États-Unis en vertu des règlements de radio amateur de la FCC que par les radio amateurs licensié.


Un service similaire existe dans les États-Unis et au Canada. Appelé le système FRS, il offre un service similaire sur des fréquences légèrement différentes. Toutefois, il convient de rappeler que les fréquences FRS sont allouées aux services d'urgence en Europe - les sapeurs-pompiers au Royaume-Uni et peuvent faire l'objet d'une action pénale.

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