There are many kinds of examinations in society at present, and the most influential one is the annual college entrance examination. This is the door for thousands of students to enter institutions of higher learning and the bridge for countless families to place unlimited hopes on. There are also entrance exams for master's and doctoral students, CET-4 and CET-6, high school entrance exams for primary school to junior high school, etc. It plays a very important role in the life of every family. In order to fully ensure that all candidates are at the starting line of a "fair competition", relevant parties have adopted many methods, one of the most important measures is to resolutely put an end to cheating.

In order to take the examination style and discipline seriously and resolutely put an end to cheating, I think it is very necessary to use necessary technical means in the examination in a timely manner. Especially in view of the current serious phenomenon of cheating in mobile phone communications, the use of equipment such as cell phone signal jammers is a very effective measure. , in order to prevent cheating through the communication of internal and external information during the examination process. By using technical means such as mobile phone signal jammers and "mandatory" restrictions on cheating in exams for a certain period of time, we can gradually achieve a complete change in concepts, cultivate and improve people's awareness of integrity. When the social credit system is imperfect and bad social trends still exist, the only way to establish a credit system is to make full use of technological means to gradually establish a truly fair competition environment.

However, people have some misunderstandings about mobile phone signal jammer products. As a long-term worker in the education industry and an in-depth researcher of this product, I have the obligation to give a brief introduction to this product from a technical point of view. Public clarification.

The working principle of the mobile phone signal jammer (also known as mobile phone signal screen blocker, mobile phone signal jammer) is as follows: the scanning signal generated by the sawtooth wave signal generator is inverted by the inverter and then enters the voltage controlled oscillator to modulate CDMA, On the three frequency bands with the same downlink frequency of GSM and PHS, the modulated frequency sweep signal is amplified by the power amplifier, and the power of the power amplifier is controlled through the voltage regulator tube to make the transmission power less than 1W. The amplified frequency sweep signal is in the form of radio waves. Launch into the air. Because the frequency sweep signal causes garbled interference in the message signal received by the mobile phone, the mobile phone cannot receive normal data sent by the base station, making it impossible for the mobile phone to establish a normal connection with the base station. Thus, the mobile phone is separated from the base station communication network. The mobile phone shows the phenomenon of no signal and no service system in the search network to achieve the blocking effect. It does not rely on unlimited power increase to compete with the mobile phone base station to achieve the blocking effect.

The intensity of the electromagnetic signal emitted by the mobile phone signal jammer is very weak. As long as the electromagnetic radiation intensity is a qualified product produced by a regular manufacturer, its electromagnetic radiation intensity has been strictly tested by an authoritative testing and certification agency, such as the "Environmental and Health Related Product Safety Institute of the Chinese Center for Disease Control and Prevention". The electromagnetic field intensity measurement values at all sampling points are lower than the relevant frequency band standard limits of the "Electromagnetic Radiation Protection Regulations" (GB8702-88) formulated by the State Environmental Protection Administration (this standard is only 1/5 of the European standard and 1/10 of the Japanese standard). It will not cause harm to the human body, so there is no need to panic. The unnecessary psychological burden is the real obstacle. The power of mobile phone signal jammer is very small (≤1W), and its range is only twenty or thirty meters. It will not cause interference to mobile phone base stations at all, and when used in specific situations, it will not endanger public information security. The frequency of the electromagnetic signal it emits completely falls within the specified mobile phone operating frequency band, and this signal is always in a relatively static and constant state. It will not affect any other electronic equipment, nor will it interfere with the human brain or affect the human brain. normal human thinking.