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1. The use of knapsack jammers should not be exchanged at the expense of public mobile communications.
Among those who use knapsack jammers, some are for exam fraud prevention, others for quietness in the venue or confidentiality of meeting information, all with good intentions and purposes. But there are also those for selfish interests. For example, the head of the household who operates a public telephone may use the shielded net on his back to interfere with the mobile communication base station near his business location, so that people who work near the public telephone he operates will not be able to use the mobile phone. Increase your financial income by switching to public phone calls. In addition, mobile communication operators may also use piggyback GPS Jammer to harm the interests of each other, so that they can gain an advantage in some local competition in the same industry. In addition, the piggyback jammer can easily be added with software to become a veritable bug.

The above list is the purpose of people using the piggyback jammer, but no matter what the purpose, it should not be exchanged at the expense of public mobile communication. In fact, according to the research, it is possible to use the backpack jammer without affecting the normal use of public mobile communications. There are three reasons for the piggyback jammer to disturb the signal of the mobile communication base station:

First, the users of the knapsack jammer completely ignore the communication needs of outsiders, and the target is wrong. The mobile phone communication of a small number of people (such as candidates) should be restricted, but the target is expanded to other ordinary people around.

Second, the use method is inappropriate. Due to the improper placement of the backpack jammer or the excessively large transmission power setting, it should be controlled in a small range but not properly controlled.

Third, the purchased knapsack jammers do not meet the approved standards for radio equipment, the power exceeds the standard, or the inferior products are unqualified. Find out the reason, in order to overcome its influence on the mobile communication signal, it is actually very simple: first, use the standard products produced by regular manufacturers, and then choose the installation location and direction of action, set the appropriate transmission power, and put it The transmitted signal can be limited to a small closed area. As long as the above three points are fulfilled, its influence on the nearby mobile communication base stations can be minimized.

2. Improper application of backpack jammers in schools may cause unnecessary harm to the human body.

Theoretical analysis shows that when the backpack jammer is working, if the transmission power is too large due to the improper setting, in a small-scale conference room, classroom and other confined spaces, the electromagnetic waves are superimposed in the narrow space, and the electromagnetic waves will pass through the walls that are originally separated from the outside. The multiple reflections from the ceiling and the ground will cause the personnel in the room to be exposed to more serious electromagnetic pollution. According to the survey, the college entrance examination and high school entrance examination are the occasions that use the most backpack shielding devices, and in some test rooms that use jammers, some parties (college entrance examination inspectors, candidates and teachers) are in a state of irritability and inability to concentrate, and some candidates even appear Headache symptoms. There are various indications that if the transmission power of the backpack shield is too large, it will seriously affect the normal thinking of candidates in the examination room. As we all know, due to the free propagation of radio waves in the air, the knapsack jammer can block the signal of the mobile communication base station in a specific area and achieve its limited purpose, but it will also harm human health to varying degrees. jammer.

The vast majority of mobile phone jammers purchased by customers are equipped with omnidirectional antennas, which originate from the simple cognition that omnidirectional antennas cover omnidirectional signals, so most customers imagine the range covered by shielded signals as: using mobile phone jammers It is a spherical coverage area emitted from the center of the sphere and diffused from the center to the surroundings. Because of this, customers will take it for granted that the installation method of the equipment is very simple, and there is no need to think too much about whether the installation is correct. Then, the problem arises. The mobile phone jammer of the omnidirectional antenna can be placed at will during installation. let it go?

This question can be discussed and answered from several aspects. First of all, if the mobile phone jammer is only installed in a small space, such as a room with only a few tens of square meters that needs to completely shield the mobile phone signal, then in this case It is relatively simple. When installing the mobile phone jammer in such a room, it is more appropriate to install it without too much consideration, because in such a space where the length and width do not exceed 10 meters, any one In the corner or on any side of the wall, the shielding distance of the mobile phone jammer is enough to cover the entire room.