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Definitions
Directory
Dictionary > Initials > ARVA
ARVA
Definition
System radio-electronics allowing the search for victims of avalanche.
Description
The ARVA is a small transmitting and receiving case of electromagnetic waves functioning on the frequency of 457 Khz. This frequency universal and has been defined at the international level for several years. Associated a shovel with snow, a probe with snow and a technique of specific research, it makes it possible to also increase the chances of rescue of a person, carrying she Arva and buried under snow. Arva in position emission, produces an electromagnetic signal which can be collected by another Arva in position reception. The received signal is converted into one or two types of signals, according to the model used. The signals aural (beep with variable intensity) and/or visual (LED or screen LCD) make possible the localization of the sender. According to the model, the range of the signal of emission or reception is variable. For several years, whatever their mark (Ortovox, Pieps, Mammut, Backcountry Access, Arva 9000...) and selected technology (analogical, numerical or mixed), they have used the same frequency standardized on a world level (457 Khz). They all are thus compatible between them. The localization of the victim is carried out by interpreting the indications provided by Arva in reception mode. These indications are a function of the distance separating the receiver and the transmitter as well as relative orientation from the two apparatuses. The essential interest is to make it possible a group with of which all the members are equipped with Arva, to be autonomous for the search and the localization for a person completely buried under an avalanche. Research can start immediately, without awaiting the arrival of the helps. This speed makes it possible to increase the chances of survival of the victim. To be really effective, the use of Arva requires a great experiment of use, that only a regular drive (exercises of search for simulated victim) makes it possible to acquire. Moreover, one Arva is always accompanied by a probe for the final localization and by a shovel to dig quickly, in order to maximize the chances of success of the rescue. Arva are compact and light (200 to 300 G). They go in shoulder-belt to more close and on the top of the body, to prevent that they is not damaged in the avalanche. Lastly, like any electronic instrument, its operation requires energy. It is essential to have always piles in good condition in its Arva and to use models of alkaline technology which are adapted perfectly to this use.
Author
Arafath Hassan
Author Email
arafath_iiuc2004@yahoo.com
References
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