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posté par Greatjammer
le 22-04-2021 à 04:38
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Mobile phone signal jammer working frequency
Generally speaking, the frequency emitted by the signal jammer interferes with the frequency of the mobile phone to receive the base station. There is a competitive relationship between the jammer and the base station. If the transmission power of the signal jammer is lower than the power delivered by the base station to the mobile phone in the actual environment, then the shield The shielding device cannot be shielded, so effective shielding can be achieved only when the power of the signal shielding device is higher than the power delivered by the base station to the mobile phone.
Therefore, because each jammer is used in a different signal environment, it will show a different shielding distance. In addition, the base station density, base station location and base station power established by the three operators of China Mobile, China Unicom and Telecom cannot be the same. of. So how many meters can be shielded by a portable jammer is not only related to its own transmission power, but also related to the distance of the base station in the environment in which it is used. In addition, there is another important factor, that is, obstacles. Metal obstacles will directly block; if it encounters a reinforced concrete solid wall, the shielding effect will be weakened after penetration; if it encounters wood or glass materials, the shielding effect after penetration will be less affected.
Typical cell phone jammer on the market operate at 869 to 894 MHz, 825 to 960 MHz, 1805 to 1880 MHz and 1900 to 1990 MHz. The working frequency bands are CDMA800, GSM900, DCS1800 and PCS1900. The input voltage and 5V output voltage of the DC-DC converter can be used to control a range of about 40m in diameter. After opening the signal shield, the message signal received from the mobile phone will form a distortion shield, the mobile phone cannot detect the normal data sent from the base station, so the mobile phone cannot establish a connection with the base station. station. The mobile phone is displayed as searching the network, there is no signal, no service system and other phenomena. The function of sending and receiving mobile phone signals in the designated area is invalid, and you cannot make calls or make calls to achieve the purpose of compulsory prohibition.
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posté par Slavic le 22-04-2021 à 21:52
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