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Le premier décrit un concept de leaky wire, une antenne filaire avec des entrées/sorties à points multiples :
EN : https://en.wikipedia.org/wiki/Leaky_feeder
FR (très concis) : https://fr.wikipedia.org/wiki/C%C3%A2ble_rayonnant
Ce genre de dispositif est utilisé dans les tunnels mais aussi immeubles de grande hauteur, où la masse de béton et d'acier créée une atténuation trop importante pour les appareils portatifs, notamment des services de secours. Quand le truc n'est pas installé, ça donne l'incendie de Grenfell :
Citation :'Useless' radioshttps://www.bbc.co.uk/news/uk-44659669
Mr Badillo also told the inquiry that during this sort of incident "you would expect heavy radio traffic".
However he said he could hear "nothing at all" from the handheld radios he and his colleagues carried.
In earlier evidence, Mr Badillo described the communication sets and radios as "useless… like something from the dark ages".
"The higher you go up the building the less reliable it is, to the point of nothing at all," he added.
In his written statement, Mr Badillo said he felt that "radio communications failed" on the night of the fire.