Originally, its were police forces and militaries who started to use certain devices to jam all the radio waves in determined area to preclude from using communication devices. The principle of blocking the communicational wave is rather unsophisticated. Blocking equipment sends radio waves of certain frequencies and as a result it creates enough interference to make transmission equipment unfit for use. Eventually the demand for such devices among citizens increased greatly and manufacturers started selling those disruptors to ordinary persons. Nowadays such gadgets, also known as jammers, are very popular and have a lot of usages. The diversity of jammers is rather great thats why you will easily find the necessary type of jammer to jam any radio signal you need. The most popular jammers are the jammers that disrupt GSM, GPS and Wi-Fi bands.
The legality of such type of gadgets varies highly in different countries. In many countries its even illegal to use cheap cell phone jammers of any type. Nonetheless blockers are widely used by ordinary citizens. Especially blockers are very popular in big cities and megalopolises.
Despite all the laws, jammers popular because they can be effective in lots of cases for example:
1. To interrupt mobile phones in theaters, movie theaters and some other public places
2. To disable cell phones in health care establishments
3. To fence conference rooms from commercial espionage activity
4. To shield offices from spying devices
5. To provide absolute informational safety
6. To prevent spies from spying on you and tracking your location
7. To prevent explosion of different kinds of bombs
8. To preclude cheating at different tests and exams
9. To prevent fakements of voting process during various elections
10. To fence militaries from homing missiles
11. To help police forces in fighting the bandits
Nonetheless, few disadvantages of interrupters can also be names. For example, jammers:
1. Are used during carjacking
2. Can be used by criminals in various ways
3. Infringe the rights of mobile network corporations
4. Make impossible to call emergency
Source story is here
May 31st, 2010
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