In order to cope with the increasingly rampant electronic signal cheating methods, many schools have even purchased test signal jammers as countermeasures, but their effective range is limited, so new questions have arisen. Is the rear shield still effective?
Jammer-MartNovember 2020
Generally, the area of the examination room is less than 100 square meters. The installed cell phone signal jammers are all low-power. Low-power products are only used in open and small areas. And the current test room cell phone 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 purchasing.
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 in order to 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.
Generally, the area of the examination room is less than 100 square meters. The installed cell phone signal jammers are all low-power. Low-power products are only used in open and small areas. And the current test room cell phone 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 purchasing.
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 in order to 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.