An avalanche or avalanche is a large mass of snow that is detached by a slope in the mountain rushing at high speed, with violence and noise. When this happens and buries people, it is transcendental to act as quickly as possible before it is too late.
Although it is true that its use is not obligatory in the mountains, from Vertic we recommend its use. Especially in winter sports. And is that all those materials that ensure our safety in the bush, are elements that can save our lives at any given time. With it, we can rescue and we can be rescued.
However. The Arva must be accompanied by both a probe and a shovel. And, if the electronic device tells us where the victim or victims are, the probe and shovel will allow us to remove all the snow that buries people.
It is easy that once found the person or people is difficult to remove them because the snow, after an avalanche, is very compact. For this, it is necessary to have both a shovel and a probe.
The rescue device must be inserted in a sheath. Always in the body, never in the backpack. Underneath the clothes but above the thermal clothes. At chest height So, if an avalanche buries us, it will not be taken from us or shot out.
How do they work?
The Arvas emit in the international frequency 457 kHz, reason why all the devices of this type that make in the world must be configured to emit in this frequency.
These radio frequency devices have the capacity to emit waves and to receive them. And, these, are issued circularly. So, be in the position that it is buried under the snow, it will always emit waves to the outside.
The emission and reception positions
The Arvas have two positions: emission and reception. Through the generation and propagation of a magnetic field using the international frequency 457 kHz through an Emergency Rescue Device for Devices in the emission position, and the other receiving device is capable of detecting the magnetic field emitted through of the antennas
These emitted signals are regulated by the European Telecommunication Standard Standard MTS 300718, which guarantees compatibility between all Device Rescue Devices by Devessalls unifying aspects such as the intensity of the magnetic field, the maximum deviation of the frequency or the duration of time of silence and emission.
In the search position, the transmitter indicates both the address and the meters with respect to the other Rescue Device for Victims for Devices. As it approaches, or is practically in contact with one another, the hairstyle is increased.
Dial signal to search more than one victim.
Three phases of a fence
The search with these radio frequency devices is divided into three phases. The first, also known as the primary search or near the first signal, consists in going through the avalanche or avalanche zone trying to find signals emitted by the buried mates.
The second phase, also known as secondary search, is to follow the field lines to approximate those of the issuer.
The tertiary search, the last of the three search phases, is based on the search for the reception of a maximum signal. This means that both the auditory signal and the distance indicate the area in which the victim or victims are found.
Technological advances in its manufacture
While it is true that the market exists with two perpendicular antennas or with a single front, the technological advances have allowed most Devices Rescue Devices to be sold today to be equipped with three antennas.
Manufactured by means of digital technology, they measure accurately the intensity and orientation of the magnetic field. This fact is very important, since it estimates the distance with respect to the injured one and it allows to know the direction to follow.
In addition, the search is simpler because the orientation of the magnetic field with respect to the receiver does not affect the intensity of the signal received.