Solargoods's Blog

The cell phone blocker uses three methods to interrupt the communication of mobile phones. Some are allowed in some public places like theaters or schools. To be eligible, a vice may not cause interference outside those covered by the scheme. Similarly, should comply with the regulations applicable to emergency calls. More importantly, this type of equipment shall only operate in frequency bands identified, without affecting other types of wireless communications (DECT phone, …), and Taik-talkie that could affect security in the building, for example , or block an emergency call could be for a very important or sensitive situation.

The polluter, which is the technique of interference from the most extreme. This case relatively little intelligence is constantly emitting a false signal on the same frequency as that of telephone relays. No calls, incoming or outgoing, are allowed to be in the range of the device. A range of 5-1 000 m, less aggressive techniques is based at the relays, allowing the phone to pass an emergency call, but prohibits incoming calls. Other systems, finally, blocking communication between a telephone relay operator by issuing a false signal, whatever the meaning of the communication is, but only after detecting a call.

Some institutions are already equipped with such systems.Sold $ 150 (unlicensed products) to more than $ 1500, cash in the market blur the GSM standards, MASC, TDMA, PCS, but UMTS and Wi-Fi. The scope of these devices vary according to their power, from five meters and can reach over 1,000 meters (usually for military applications).

Three techniques to disrupt communications

1. Air Pollution: The area is covered by a type of gag polluter. All forms of communication from a mobile phone is impossible. In general, these devices, we can not guarantee that interference will not overflow outside the area in question.
2. The management of interference with emergency calls, the chuck is equipped with a repeater, which recognizes that age is to call emergency services. The emergency call is allowed, but not to others, whether incoming or outgoing. The other radio signals (DECT, Wi-Fi, etc.) Do not interfere.
3. Interference detection after the call: The gag is activated only when it detects a call (incoming or outgoing) and is not allowed in the area it covers. It then sends a signal type BCCH (channel of information between the cell and the mobile operator), so that cuts base station communication. The other radio signals are not interrupted.

So it is obvious that the second method is the most reliable and convenient for public use.