A brief discussion on mobile phone signal jammers from YIFALIU's blog

Due to the development of communication technology, personal mobile communications have brought convenience to people's lives, but the adverse effects on prisons, detention centers and other similar situations have become increasingly prominent. Once mobile phones are illegally brought into prisons and used, it will bring great harm to the management and security of prisons, detention centers and other places. Therefore, only by establishing a truly effective mobile phone signal blocking system can we provide prisons and detention centers with strong technological support.

However, due to the current mixed market, many cheap cell phone jammers are mainly suitable for general civilian use due to limitations in performance indicators, reliability, operating conditions, etc. However, there may be certain problems when used in large places such as prisons and detention centers. For example, external interference problems, some even seriously affect public communications.

Why do mobile phone signal jammers purchased by the Provincial Prison Administration Bureau cause such great interference to surrounding public communications? Let me analyze it a little bit. If there are any shortcomings, I hope you guys can correct me:

1. Mobile phone signal shielding is technically just a small branch of the wireless signal shielding system. Its essence is electronic countermeasures, or co-channel interference, which uses equipment to send out high-frequency signals through antennas, allowing mobile phones to receive them. Bit errors occur during the downlink signal and cannot be recognized and connected to the network. The mobile phone displays a no-network status, which meets the signal shielding requirements;

2. Regarding mobile phone signal blocker, everyone knows that they need to interfere with downlink signals. However, due to a series of factors such as technical cost, price, and production constraints, it is difficult to only interfere with downlink signals. Therefore, some unscrupulous manufacturers do not make accurate signal jammers in order to improve the interference effect. Adjusting the frequency range will cause some interference energy to the uplink, which can indeed greatly improve the interference capability and achieve a hit-or-miss effect, but it sacrifices public interests;

3. Mobile phone signals may vary greatly in the same room at different locations and at different times. According to actual experience, it can reach about 10dBm. In terms of conversion success rate, the difference is 10 times. It can be seen that mobile phone signal blocking is actually a technically demanding project, and it cannot be solved by simply purchasing a mobile phone signal jammer and installing it yourself. Site survey, power calculation, construction design, equipment debugging, etc. are all complementary and inseparable.

4. As Liuzhou Prison purchased and installed more than 300 mobile phone signal jammers, from a professional point of view, there are major problems in itself. When signal shielding is required in a large area and complex environment, high-gain antennas should be used for large-scale shielding combined with small The indoor antenna at the leakage point in the range is shielded by supplementary optimization. The angle of the antenna and the power of the equipment require professional personnel to configure and debug in order to achieve the perfect effect of strict shielding inside the prison and no interference outside the prison. Short-term signal shielding in schools can use high-quality low-power portable jammers or temporary antenna deployment.