The cell phone has long ceased to be a luxury item - today it is literally a vehicle, that is communication, in other words, necessary and useful in everyday life thing.
However, not all and always greet her with open arms. Let us recall the annoying calls in the theater, which can spoil the impression of any statement ...
If previously the only way to stop the outrage was selfish mobilovladeltsa curse, but now more and more a thought of a special device that can fundamentally solve the problem. So if you are tired of working meetings, conferences or seminars under the chimes of mobile phones, or you are concerned that any tube can be used as a "radiozhuchka" (goodbye, privacy!), Will have to take advantage of mobile jammers, such as Mobile Jammers, destined to lock mobile phones.
For the introduction of such devices in life are the owners and visitors theaters, concert halls, restaurants and other establishments where cell phone calls can cause inconvenience. I must say that their wishes were heard. So, for example, since last year the Canadian company Industry Canada consults on lock cell phones in various public places - from the examination room before the plants where the use of cellular phones is prohibited for safety reasons.
Huge demand for jammers and in the Central Asian states, where they are used to block calls to the temples and mosques. In France, the law in question, allowing the installation of mobile jammers in libraries and museums.
Manufacturers of tubes and mobile operators, in contrast, are against the idea of blocking, citing the fact that the possibility of call may depend on human life and health. Thus, according to official statistics, in 2001 the Canadian Rescue Service "911" with a mobile phone has received about 3 million. Calls. Although certain legalization mobile jammers much more concerned operators in terms of reducing their income.
In Russia, the use of any radio-emitting devices to operate without a permit issued by UGSN, is strictly prohibited. Get permission to use the mobile jammers can now only special services that use them primarily against terrorists. Powerful generators used by specialists in the disposal of explosives, cell phones block, used for remote detonation of bombs.
As for the jamming, they are of two types. The first group includes devices that suppress all alarms in a certain area:
- Noise generators that generate RF noise and allows the phone to communicate with a base station (by the way, the most common solution today). Suppressing range is from 4 - 25 and 40 - 50 m - depending on the location of the room in relation to the base station and the interference power generator. This generator must generate a noise signal only in the range of the mobile communications and not to create interference with other wave devices. There are models with detection function, which is implemented by means of cellular signal receiver comprising a generator only when attempting to transmit a signal.
- Special electromagnetic shield panel (Faraday Cage), the development of the Japanese engineer Haydeo Oka (Hideo Oka), uses a passive blocking cellular signals. Wood panels with thin plates of nickel - zinc alloy block up to 97% of the radiation of radio waves.
Such panels are now on sale in the US and other countries where the use of active noise generators.
Indeed, while there are no standards for the certification of buildings, ensuring the necessary level of the signal bandwidth.
The second group includes devices used to force irresponsible citizens observe basic rules of decorum:
- So-called "smart" devices that use detection feature phone and transmitting signals to the operator of cellular communication, informing it that the phone is in "safe" zone. The operator automatically prevents incoming calls until until the phone out of this zone.
- Lighthouses using Bluetooth technology, or IR - port that automatically translate any compatible phone to "silence".
In the internet - shops the whole spectrum Jammers. We only mention the British jammers SureSafe, designed for mainstream users. Outwardly, it looks like a normal cell phone, weighs only 200 grams and provides a zone blocking up to 15 meters. The device is designed to block cellular phones in cars or in unorganized areas. Device emits far less than the usual mobile phone, so it is absolutely harmless. The device independent, complete and comes charging nickel battery, which, alas, is only enough for a few hours. There is one "but": unfortunately, the machine generates noise only at frequencies GSM 900/1800. Sell jammers are only in those countries where the use of such devices is permitted. Well, you can buy it at: www.starportuk.com for $ 300.
In the web you can also find Jammers Russian, Israeli, and even Ukrainian production. Interconnected models differ only by the power of the generator, as well as a range of suppressed spectrum. It must be admitted that the cost of domestic counterparts until much higher overseas. So, for the Russian unit of "Radioservice" will have to pay $ 2,000.
In principle, any person with sufficient qualifications, jammers can assemble yourself. The scheme is simple: you need a single chip (you can use 74LS04, K555LN1, KR1533LN1 or KR531LN1), absolutely any capacitor, battery and antenna (a piece of wire of length 20 - 30 cm). The apparatus muffles the frequency range of about 500 mg. Range - 30 meters, and the cost - just a few dollars.
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