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In today's information age, the development of communication technology is changing with each passing day. As a unique talent in the communication family, mobile communication plays an important role in people's life, industrial and agricultural production and other fields. Today, let's talk about cell phone signal jammers in prisons. Secondly, while the mobile phone brings great convenience to people's life, it also produces some problems that cannot be ignored. Due to the wide coverage of the mobile communication network, the use of mobile phones has brought trouble to people in some occasions with the emergence of the network. , and even security risks, such as:

(1) Become a new leak channel, posing a threat to the security of confidential information;

(2) Become a new source of noise pollution and interfere with the normal working order;

(3) Become a new unsafe factor, bringing hidden dangers to the safety production of enterprises;

(4) It becomes a new crime method and has an impact on social stability. Therefore, in some places, we should be able to artificially destroy or limit this kind of network to avoid the harm caused by the mobile network. Under this premise, the conference room mobile phone signal jammer came into being. The essence of the mobile phone signal jammer is that it implements electromagnetic interference on the wireless network on which mobile phone communication depends, so that the mobile phone cannot access the network, and thus cannot receive information from the mobile network, and cannot send information through the network. But it has no effect on the signal generated by the phone.

In order for the mobile phone signal jammer to effectively interfere with the mobile network, it must be ensured that the signal field strength sent by the jammer should be much larger than the field strength of the mobile signal BCH in the interference area. Therefore, the same jammer is used in different locations and the size of the effective area of ​​interference It is different. Generally, the closer to the base station, the stronger the field strength of the local BCH, the smaller the area where the jammer can achieve effective interference, and the general interference radius can only reach 0.5 ~ 9m; Then the radius of the jammer to achieve effective interference is larger, which can reach more than ten meters to several tens of meters. Therefore, the size of the local BCH field strength should be fully considered before using the jammer, and then the location, quantity and combination of the jammers should be determined according to the size of the interference area.

Obviously, the farther the shield is from the base station, the weaker the field strength and the larger the interference radius, and vice versa. The jammer loses its jamming ability if it is too close to the base station.

The interference range of the same shield is doubled when used outdoors than indoors. If the interference range is within 200m, a shield is generally installed, that is, it can be hung in the indoor wall with a distance of 1 to 1.8m from the ground; if it is greater than 200m, generally Two or more sets should be installed, and they should be placed on the front and rear walls; if the interference space is outdoors and larger than 1000m, multiple sets should be used, and the effect of cellular distribution is better.

Since the frequency band used by the mobile phone is dedicated, the emission frequency of the mobile phone signal jammer in the conference room completely falls within the working frequency band of the mobile phone stipulated by the state, so it has no effect on other electronic equipment such as TV and radio. At the same time, the mobile phone jammer only interferes with the BCH transmitted by the base station received by the mobile phone, so that the mobile phone cannot establish contact with the base station, so it does not have any impact on the mobile phone. In addition, although the signal field strength it sends is stronger than BCH, it is far weaker than the electromagnetic radiation field generated by mobile phone calls through testing, so it will not cause harm to the human body and can be used for a long time with confidence.