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The R-855 Aviation Search and Rescue Radio Station has been produced since 1959. Radio station '' P-855 '' (Komar) is intended for radio communication in extreme conditions. It was used in aviation, for communication between parachutists and the ground, in emergency and search situations. Radio station "R-855" completed the costumes of military pilots. When used in emergency cases, when falling onto the water, the kit, in which the antenna was inflatable, was inflated with compressed air and the radio station began to give a "SOS" signal. Subsequently, the radio station was upgraded several times to P-855-2M, P-855U, P-855UM and other options. The first radio stations were assembled on rod lamps, followed by transistors. In addition to the model, the radio stations also had the configuration options A, B, C. It was possible to connect a helmet to the radio station. The operating frequency of the radio station is 121.5 MHz. Transmitter power 100 MW. Sensitivity 5 µV. The detection range of signals from a height of 10,000 meters reached 300 km.