Nowadays, many schools are busy preparing for the examination room. This is because the most important exam of the year, the college entrance examination is about to come. In the face of this most important exam, many schools are actively preparing what they need to arrange the exam soup, ensuring the normal order of the exam room and meeting the basic needs of the exam room, and many of them are responding to the current rampant The electronic signal cheating method of the company has also purchased the test signal jammer as a countermeasure, but its effective range is limited, so new questions have arisen. Is it effective after the wall is shielded?
Generally, the area of the examination room is less than 100 square meters. The installed mobile phone signal jammers are all low-power. Low-power products are only used in open and small areas. And the current exam room mobile phone signal jammer technology is very mature, only shielding the downlink , Does not shield the upstream. The power of the mobile phone signal jammer in the examination room is divided into 12W, 16W, and 18W. There are more than 30 models. The function and power of each model are different. You can read the manual in detail when you buy it.
The frequency emitted by the signal jammer interferes with the frequency of the mobile phone to receive the base station. The jammer and the base station are destined to be a contested relationship. If the transmission power of the signal jammer is less than the channel power delivered by the base station to the mobile phone in the current environment, then the jammer will It can’t be shielded, and only the power of the signal jammer is greater than the power delivered by the base station to the mobile phone, so that it can be effectively shielded. Reinforced concrete solid walls will attenuate less than 10 times after penetration; if it is made of wood or glass, the attenuation will be relatively small.