Sprint Call Blocking Cell Phone
Simply put, this is very similar to a sound signal. When the mobile phone tries to establish a connection with the base station, Sprint Call Blocking Cell Phone suddenly pops out and covers the communication signal with very large noise in the same frequency band, making the signal received by the mobile phone unruly and impossible to detect. However, the power of the signal jammer is not as large as possible. If this interference emission is not scientifically calculated and unreasonably controlled, it will not be conducive to protecting the environment. Therefore, using a reasonable algorithm to control the transmission direction and power of the interference signal of the mobile phone jammer must not only maintain the shielding effect of the mobile phone signal, but also meet the safety limits. Generally speaking, the closer to the base station, the stronger the local BCH field strength, and the smaller the area where the jammer reaches effective interference. Generally, the interference radius can only reach a few tenths to a few meters; the farther away from the base station, the BCH field strength is relatively weak. , Then the mobile phone jammer reaches the larger the effective interference radius, which can reach more than ten meters to dozens of meters. Therefore, we should fully consider the size of the local BCH field strength before using the mobile phone signal jammer, and then determine the location, number and combination of jammers according to the size of the interference area. The farther the mobile phone signal jammer is from the base station, the weaker the field strength and the larger the interference radius, and vice versa. The mobile phone jammer will also lose its interference capability if it is very close to the base station. Nowadays, the automatic monitoring and shielding mode of the whole network is adopted. Its shielding technology is advanced, malicious interference is eliminated, electromagnetic radiation is controllable, and the shielding effect is obvious. It is more suitable for use in the college entrance examination examination room, so that the system can be deployed under the premise of ensuring a good signal in each area. The distribution position of each floor is determined according to the design requirements and the specific installation position, which can ensure that the edge signal strength of the building is within the required range. In terms of shielding distance, the entire network automatically monitors the shielding mode with low output power, low electromagnetic radiation, and power can be flexibly adjusted. In addition, there are mobile phone jammers in pseudo base station mode, which can interrupt the connection with the core network by connecting mobile devices to false public network base stations. This mode can overcome to a certain extent the insufficiency of pure shielding mode such as much interference, strong radiation and difficult control, but it cannot locate illegal signals and cannot cover the required frequency band, so its effect is not as good as the automatic monitoring and shielding mode of the whole network. . cell phone jammer
Nowadays, the Sprint Call Blocking Cell Phone used in the examination room is full frequency band, which can interfere with all frequency bands of the three operators 2G/3G/4G/5G, and WIFI signals and Bluetooth signals can also be shielded. But the frequency band of mobile phone signals is mainly 850-4900MHz, and the frequency band of electromagnetic waves covers from a few Hz to several hundreds of GHz. Will there be some signals that can be transmitted in the examination room? The answer is yes, radio communication tools with dedicated frequency bands "came into being" in this context. The working frequency band of these devices is selected outside the frequency range covered by the mobile phone jammer, and the general mobile phone signal jammer does not work on them. Therefore, for this special radio communication tool, each examination room is specially equipped with a monitoring vehicle equipped with a radio monitor for real-time monitoring of radio wave signals from unknown sources. Nowadays, with the large-scale use of drones, monitoring will become more convenient. The mobile monitoring vehicle constantly changes its position through triangulation, and the monitoring equipment can locate the signal transmitter according to the distance and the strength of the signal, and capture the offenders using these radio communication tools on the spot.