![]() The signal from the detector can also weakly be reflected from other electronic devices, such as cameras and cell phones, as well as metallic objects. The detector works by transmitting at one frequency on a 20% duty cycle and listening for a harmonic reflection at double the frequency. ![]() Short-range portable detectors are used, transmitting via a directional antenna at 866.9 MHz (Europe) or 902.85 MHz (US) and receiving at twice the frequency. During a search and rescue, its signal can locate RECCO reflectors within a range up to 80 meters through air and 20 meters through packed snow, depending on various factors such as the snow conditions and depth. The R9 detector, released in 2009, weighs 900 grams. Due to the diode, the returned signal is doubled in frequency - harmonic radar. Judging from the audio tone a trained professional rescuer can determine the location of a buried victim. The returned signal is translated into an audio tone if the detector is pointed in the direction of a reflector. If the signal hits a reflector it is echoed back to the detector. The detector sends out a highly directional radar signal. ![]() More than 150 brands integrate RECCO reflectors into their outdoor gear, including ski boots, helmets, hiking shoes, jackets, pants and backpacks. The company suggests that two reflectors in different locations are ideal. Its dimensions are 13 mm × 51 mm × 1.5 mm and it weighs 4g. The reflector is a passive transponder, which does not require batteries or activation, consisting of a diode and an antenna. In 2015, RECCO introduced the RECCO SAR Helicopter detector that expands the technology to finding a missing person in other outdoor environments. In 1987, a woman was localised with the RECCO rescue technology from a helicopter in Lenzerheide, Switzerland, in the first live rescue found using the technology. ![]() Granhed formed RECCO AB in 1983 and created the first functional prototype. Starting in the winter of 1978–1979, Granhed collaborated with Bengt Enander's team at the Department of Electromagnetic Theory, Royal Institute of Technology in Stockholm to develop an avalanche rescue system, using the principle of harmonic radar. The RECCO rescue technology was developed by Magnus Granhed, in response to his personal experience with a fatal avalanche accident in Åre, Sweden, in 1973. The system is based on a harmonic radar system and composed of a detector and a passive reflector integrated into outdoor clothing and gears. RECCO is a rescue technology used by organised rescue teams as an additional tool to more quickly locate people buried by an avalanche or lost in the outdoors. ![]()
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