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1. The use of full-band signal jammers should not be exchanged at the expense of public mobile communications.

Among the people who use the full-band shielding device, some are to prevent cheating in exams, and some are for the quietness of the meeting place or the confidentiality of meeting information. These are all out of good wishes and purposes. But there are also self-interested ones. For example, the head of the household who operates a public phone may use a full-band signal shielding device to interfere with the mobile communication base station near his business location, so that people who work near the public phone operated by him will not be able to use the mobile phone. Instead, use public telephone calls to increase your own economic income. In addition, mobile communication operators may also use full-band signal jammer to harm the interests of each other, so that they can gain advantages in some local competitions in the same industry.

What is listed above is the purpose of people using the full-band signal jammer, but no matter what the purpose is, it should not be exchanged at the cost of sacrificing public mobile communications. In fact, according to research, it is possible to install a full-band shielding device without affecting the normal use of public mobile communications. There are three reasons why the full-band signal shielding instrument disturbs the signal of the mobile communication base station:

First, the users of the full-band shielding device did not take into account the communication needs of outsiders at all, and the target was wrong. It should have restricted the mobile phone communication of a small number of people (such as examinees), but expanded the target to other ordinary people around.

Second, the method of use is improper. Due to the improper installation position of the full-band signal shielding device or the excessive setting of the transmission power, it should be controlled in a small range but it is not well controlled.

Third, the purchased full-band shielding instrument does not meet the approved standards for radio equipment, the power exceeds the standard, or is of inferior quality and substandard products. After identifying the cause, in order to overcome its impact on mobile communication signals, it is actually very simple: first, use qualified products produced by regular manufacturers, second, choose the installation location and direction of action, and third, set the appropriate transmission power , to limit its emission signal to a small airtight range. As long as the above three points are achieved, the impact on nearby mobile communication base stations can be minimized.

2. Improper application of the school's full-band signal shielding device may cause unnecessary harm to the human body.

Theoretical analysis shows that when the full-band shielding instrument is working, if the transmission power is too large due to improper settings, in a small-scale meeting room, classroom and other confined spaces, electromagnetic waves will be superimposed in a small space, passing through the walls that are originally separated from the outside, Multiple reflections from the ceiling and the ground will cause people in the room to be exposed to serious electromagnetic pollution. According to the survey, the college entrance examination and the high school entrance examination are the occasions where the full-band signal shielding device is used the most, and in some examination rooms where the full-band signal shielding device is used, some parties (college entrance examination inspectors, candidates and teachers) appear to be irritable and unable to concentrate. Individual candidates even have headache symptoms. There are various indications that if the transmission power of the full-band shielding device is too high, it will seriously affect the normal thinking of candidates in the examination room.

As we all know, the characteristics of free propagation of radio waves in the air, the full-band signal shielding instrument can block the mobile communication base station signal in a specific area and achieve its limited purpose, but it will also harm human health to varying degrees, so it should be used with caution. Band shielding instrument.