At present, there are many exams in society, and the most influential one is the annual college entrance examination. This is the door for thousands of students to enter the halls of institutions of higher learning, and a bridge for countless families to place infinite hope. There are also entrance exams for master's and doctoral students, CET-4 and CET-6, middle school entrance examinations for primary school and junior high school, and so on. It plays a very important role in the life of every family. In order to fully ensure that all candidates are on the starting line of a "fair competition", the relevant parties have adopted many methods, one of which is to resolutely eliminate cheating.
In order to be serious about exam discipline and resolutely put an end to cheating, I think it is very necessary to use necessary technical means in the exam at the right time. Especially for the current serious phenomenon of mobile phone communication cheating, the use of mobile 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. Using technical means such as mobile phone signal jammers, through a certain period of "compulsory" restricted examination cheating, gradually realize a radical change in concepts, cultivate and raise people's awareness of honesty. When the social credit system is imperfect and bad social atmosphere still exists, it is the only way to build a credit system to gradually establish a truly fair competition environment with the full use of technical means.
However, people have some misunderstandings about cell phone jammer products. As a worker who has been engaged in the education industry for a long time and an in-depth researcher of the product, I have the obligation to briefly describe the product from a technical perspective. Public clarification.
The working principle of the mobile phone signal jammer (also known as the mobile phone signal screen blocker, the mobile phone signal jammer) is as follows: the scanning signal generated by the sawtooth signal generator is inverted by the inverter, and then enters the voltage-controlled oscillator to modulate the CDMA, On the three frequency bands with the same downlink frequency of GSM and PHS, the modulated sweep signal is amplified by the power amplifier, and the power of the power amplifier is controlled by the voltage regulator tube to make the transmission power less than 1W. The amplified sweep signal is in the form of radio waves Launch into the air. Because the frequency sweep signal forms garbled interference in the message signal received by the mobile phone, the mobile phone cannot receive the normal data sent by the base station, so that the mobile phone cannot establish a normal connection with the base station. So that the mobile phone is separated from the base station communication network. The mobile phone displays the phenomenon of no signal and no service system in the search network to achieve the blocking effect. It does not rely on the unlimited increase of power to compete with the mobile phone base station to achieve the blocking effect.
The intensity of electromagnetic signals emitted by mobile phone signal jammers is very weak. As long as qualified products produced by regular manufacturers, their electromagnetic radiation intensity has been strictly tested by national authoritative testing and certification organizations, such as the "China Center for Disease Control and Prevention Environmental and Health Related Product Safety Institute" , 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/ of the Japanese standard) 10) 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 the mobile phone signal jammer is very small (≤1W), and the range of action is only 20 to 30 meters. It will not cause interference to the mobile phone base station at all. Moreover, when used in specific occasions, there is no question of endangering public information security. The frequency of the electromagnetic signal sent by it falls completely within the working frequency band of mobile phones specified by the country, and this signal is always in a relatively static and constant state, which will not affect any other electronic equipment, let alone interfere with the human brain, Affect people's normal thinking.