Français : émetteur récepteur de naufrage type BC-778 employé dans les radeaux des navires, des avions. Le signal sur 500 kilohertz (2 W) peut être entendu jusqu'à plusieurs dizaines de kilomètres par les avions et les bateaux. La fréquence de 500 kilohertz a besoin d'une longue antenne érigée par un cerf-volant ou un ballon. La puissance de 4,8 watts était fournie par un générateur à manivelle. La manipulation SOS peut être automatique, ou manuelle. (Depuis 1942 à 1999)
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{{Information |Description={{en|1="Gibson Girl" w:survival radio BC-778.}} |Source=Own work by uploader |Author=ArnoldReinhold |Date=April 19, 2009 |Permission= |other_versions= }} I took this photo of an item on display at the