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Informations générales relatives à la trans-
mission radio
Les signaux radio consistant en des ondes élec-
tromagnétiques, le signal est atténué lorsqu’il
passe de l’émetteur au récepteur (limitation de
portée). À cela viennent s’ajouter d’autres fac-
teurs perturbateurs tels que les objets métalliques
présents dans les murs, les feuilles métalliques
destinées à l’insonorisation, etc. Apparaît alors
une zone morte (voir tableau).
Autres sources de perturbations
Les appareils fonctionnant également avec des
signaux haute fréquence, comme les ordina-
teurs et les transformateurs électroniques, entre
autres, constituent également des sources de
perturbations.
L’écart minimal à observer avec ces appareils
s’élève à 0,5 m.
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Matériau sec Épaisseur du
matériau
Transmission
Bois, plâtre, plaques
de carton plâtre
< 30 cm 90–100 %
Briques de terre cuite,
plaques de contre-
plaqué
< 30 cm 65–95 %
Béton armé < 30 cm 10–70 %
Métal, treillis métalli-
que, aluminium
< 1 mm 0–10 %
Métal, aluminium
feuilleté
< 1 mm 0 %
Transmission
Attention : la présence d’humidité dans les
matériaux ralentit la transmission !
12


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