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Avalanche transceivers
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Avalanche transceivers are worn by skiers, hikers, and others in mountainous areas prone to avalanches. The low frequency (457 kHz) signal is emitted when a person is buried in snow, and the general location and direction of the buried transceiver can be determined by search and rescue groups. The low frequency/long wavelength signal travels well through snow.
Until the 1980's, the frequency 2.275 kHz was used. Until the late 1990's, dual frequency (2.275/457 kHz) units were available. Presently, only 457 kHz units are used, and experts recommend not using earlier dual-frequency units, due to potential problems with frequency drift of the older technology.
One modern example transceiver is the Backcountry Access Tracker2, with FCC ID OUNT2. Details about this unit, including emissions tests, can be retrieved from the FCC ID Number search utility on the FCC Web site.
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Frequencies |
| Frequency | Bandwidth | Use | Service | Table |
| 2.275 kHz | 0.1 kHz | Avalanche Transceiver (obsolete) | - | - |
| 457 kHz | 4 kHz | Avalanche Transceiver | - | - |
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