In addition, many criminals using mobile phones or other mobile communication devices and other high-tech criminal activity began to emerge in recent years, a new problem, such as the use of cell phones, pagers and other mass communications equipment remote control bomb detonated, the implementation of criminal activity has become more The more criminals to use means such as sabotage is covert, it is very difficult to prevent, and to the relevant police investigators bring great danger. Mobile phone jammers, also known as: jammers, jammers, mobile jammers, mobile phone signal blocker, mobile phone signal isolator, cell phone signal cut off device, it appears to effectively solve the above problem: it produces a particular electromagnetic signal covers the GSM900, DCS1800, CDMA and PHS three major frequency bands and large well-informed, can be shielded 139/138/137/136/135/133/132/131/130 / PHS and large well-informed, limit cell phone In certain range of use.Please don’t keep the light of cell phone jammer on for an overlong time
Discharge electrostatic charge, so as not to cause interference with the internal discharge device; - electronic circuit system to improve job stability. 2.2 Classification 2.2.1 suspension system to an electronic device and connected earth ground systems, and other conductive structures with insulation. Suppress the interference from the main wiring shown in Figure 1. The advantage is a good anti-jamming performance. Drawback is that electronic equipment prone to static electricity accumulation. When the charge accumulation reaches a certain level, it will produce electrostatic discharge, while the lightning environment, electrostatic induction voltage generated in the equipment cabinet will be generated within the arc, a strong destructive interference, the operator was also easy to make electricity hit. cell phone jammer can be utilized in various locations. 2.2.2 Single-point grounding refers to the electronic circuit device in the first reference signal at one point, then the access point connected to the facilities of the earth system, shown in Figure 2. The advantage is simple and practical, to other parts of the current line is not coupled into the circuit. Disadvantage is that a large number of conductors, high cost, but as the frequency increases, the ground impedance will increase, resulting in the ground is not ideal. Generally applies to the following operating frequency of 1MHz in the low-frequency devices and systems. 2.2.3 refers to multi-point grounding of the circuitry of electronic devices connected to the nearest ground to low-impedance line, so that the shortest ground wire, shown in Figure 3. cell phone jammer has different kinds of functions for the detailed parameters are different. The advantage is to simplify the electronic circuitry within the device structure, can effectively reduce the grounding resistance and reduce the stray inductance between the ground and stray capacitance caused by the mutual coupling between circuits. The disadvantage is higher docking site. Required to minimize stray inductance and ground wire distributed capacitance, emphasis on good connections. Mainly applied to high-frequency multi-point grounding circuit.
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