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La portée dépend de nombreux facteurs. Outre la puissance d’émis-
sion régulée par la loi, la position de l’antenne (exemple l’antenne
doit être orientée verticalement de sorte qu’elle puisse transmettre
librement son signal), l’alimentation en énergie (des accus complè-
tement chargés permettent d’exploiter pleinement la portée) et avant
tout l’environnement dans lequel la radiocommunication s’effectue,
jouent un rôle important.
Chaque « obstacle » (collines, bâtiments, immeubles, arbres) réduit
la portée, certains matériaux (béton armé, blocs de pierre) peuvent
réellement causer des interférences. Dans des conditions optimales
(avec 1 champ de vision libre), le PMR 446 a une portée de 10 km
au maximum. Dans un environnement légèrement accidenté (en
montagne, au milieu d’immeubles en béton armé), la portée peut se
réduire à quelques centaines de mètres voire moins.
CONTENU
2 émetteurs-récepteurs portatifs PMR 446
2 clips de ceinture amovibles
1 socle chargeur double
1 bloc d’alimentation 230 V AC / 50 Hz
8 accus rechargeables NiMH 4,8 V / 600 mAh
1 manuel d’utilisation
4


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