When the mobile phone works, it is within a certain frequency range. The mobile phone and the base station are connected by radio waves, and the data and sound transmission are completed with a certain baud rate and modulation method. In response to this communication principle, the mobile cell phone jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during operation. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as a search network, no signal, no service system and other phenomena.
Common mobile phone signal jammers on the market, their operating frequencies are: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The operating frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control the range of about 40 meters in diameter, using DC-DC converter input voltage and 5V output voltage.
How to use mobile phone signal jammer
1. Select the area where you need to cut off the mobile phone signal, and place the cutter on the desktop or wall in this area.
2. After the installation is complete, turn on the power of the disconnector and turn on the power switch.
3. After the equipment is connected, press the power switch and disconnector to work. At this time, all the mobile phones turned on at the scene are searching for the network, and the base station signal is lost. Both the caller and the caller cannot establish a call.
The emergence of mobile phone signal jammers has played a certain role in restraining the increasingly serious “mobile phone noise pollution”. However, as a mobile communication interference device, will the electromagnetic radiation generated by the mobile communication interfere with human health? A topic of concern. At the same time, during the installation and use of mobile phone shielding equipment, due to the greater autonomy and randomness in terms of the number of installed units, transmission power, coverage, and radiation control, some places require effective interference and The shielding effect is maximized, and even the installation and use of high-power mobile phone jammers are blindly introduced. The impact and damage to the human body cannot but be worrying.
As another product of human beings, “mobile phone signal jammer”, it will certainly bring certain negative effects while shielding mobile phone signals and ensuring information security. However, when we look at the problem, we should see the main contradiction. Just as we did not stop using a kitchen knife because it cuts vegetables, we will not reject a “mobile phone signal jammer” because it may cause harmful radiation to the human body. After all, the “mobile phone jammer” guarantees information security and contributes to social stability is its main contribution. The most important thing is that it brings security to places with high safety factors such as prisons, detention centers, and major conferences.
As far as the quality of the mobile phone signal shielding system is concerned, judging by the current level of scientific understanding, there is no security problem. The reason for this is mainly based on the following two reasons:
First, from a technical perspective, although the mobile phone signal shielding system is a new technology product, it should be said that it has been developed more mature in terms of technology, so it has higher security. According to the test report of the authoritative testing organization, the qualified mobile phone signal shielding system has low radiation, and because it is usually installed in high places, it has no adverse effects on human health.
Second, from a practical level, many authoritative units in China have begun to use mobile phone signal shielding systems. For example, in 2004, in order to maintain the solemn atmosphere of the memorial hall and meet its special confidentiality requirements, the Chairman Mao Memorial Hall Administration installed a mobile phone signal shielding system produced by Shanghai Jike Electronics Co., Ltd. in the memorial hall. After actual use and testing , The Memorial Hall Administration believes that the products produced by Jike Company meet all its requirements including safety and aesthetics. I think this should be a very convincing case. In addition, according to the information collected by the author, as a leader in the mobile phone signal shielding system industry, the products produced by Shanghai Jike Electronics Co., Ltd. are used in the prisons of the judicial departments and the detention centers of the public security departments. All of them are used, and the feedback after use is believed to be a proof of immortality.
It is very interesting that the mobile phone, which is the “enemy” of the mobile phone signal shielding system, has also caused controversy about security when it first appeared. In less than ten years, mobile phones have become an indispensable necessity in our lives, and even because of the popularity of mobile phones, a new generation has been born: the thumb generation. This shows the popularity of mobile phones. In the history of human knowledge, the development of one aspect of contradictory things can predict the future of another aspect. Such examples are not uncommon. I think the development of mobile phones as the “enemy” of the mobile phone signal shielding system may be It can provide a blueprint for us to predict the industry picture of the mobile phone signal shielding system.
Finally, I want to tell a true story: when China was building the Daya Bay Nuclear Power Plant in Guangzhou in the 1990s, Hong Kong citizens were very resistant to the project because of the safety of nuclear power. In order to dispel the doubts of Hong Kong citizens, the chief engineer of the project I joked that kitchen knives are also problematic in safety. Kitchen knives can cut fingers inadvertently, and even be used as murder weapons by wicked people. But this does not prevent us from using kitchen knives and does not prevent China from becoming a great food country, because as long as we do our best Can prevent these things from happening. This superb joke at the time greatly alleviated the resistance of Hong Kong people to the Daya Bay nuclear power plant and made a small contribution to the smooth start of the nuclear power project.
There is no doubt that technology is a double-edged sword. We all know that mobile phone jammers have a certain amount of radiation. At present, there is no authority to define how much this radiation hurts people. What we should do is to start from a people-oriented perspective as much as possible and make good use of the benefits of technology. , To control and reduce the disadvantages of science and technology, to determine whether to use it widely in daily life under the premise of ensuring human safety and health, and not for the uncivilized behavior of a very small number of people, and ignore or even affect the interests of most people.