The blocking range of cell phone jammer relates to the installation position

In the high-frequency circuits must use multi-point grounding, and grounding requirements of the length of each wavelength of the signal is less than 1 / 20. 3) Mixed ground: both contain a mixture of ground characteristics of single-point grounding, but also contains the characteristics of multi-point grounding. For example, the power system needs a single point grounding, and the RF signal and multi-point grounding requirements, then you can use a mixture of ground as shown in Figure 3. For DC, capacitor is open circuit, the circuit is single-point ground for the RF, capacitance is conducting, the circuit is a multi-point grounding. While many large volume of interconnected devices (the device's physical size and the connecting cable interference with any existing large compared to the wavelength of the signal) when there is the role of the cable through the chassis and the possibility of interference. When this happens, the interference current path is usually present in the system to loop.
Now there are many of the grounding methods are derived from past success, these methods include: 1) single-point ground: as shown in Figure 1, single-point grounding circuit together for many potential reference point for the provision of public methods, so signals can be transferred between different circuits. If there is no common reference point, an error signal transmission. Single-point grounding requires that each circuit ground only once, and then at the same point.The blocking range of cell phone jammer relates to the installation position. Often one of the Earth as a reference point. Since there is only one reference point, so you can believe there is no ground loop exists, therefore there is no interference. 2) multi-point grounding: as shown in Figure 2, can be seen from the figure, the device within the circuit are the case as a reference point, and they have all the equipment chassis ground as a reference point. This structure provides a low earth ground impedance, this is because the multi-point grounding, the ground can be very short each; and multi-wire grounding conductor in parallel to reduce the total inductance. The blocking range of      cell phone jammer relates to the installation height.
The blocking range of    cell phone jammer      relates to the antenna direction. In considering the grounding problem, we should consider two aspects, one is the system of self-compatibility issues, the other is external interference coupled into the ground loop, resulting in system malfunction. Due to external interference is often random, so it is often more difficult to solve. Grounding requirements should be grounded for many reasons, few are listed below: 1) safety ground: AC equipment must be grounded through the yellow-green safety ground, or when the device is within the power supply and case insulation resistance between the variable hours, will cause electric shock. 2) ground lightning: the lightning protection system facilities is an independent system, the lightning rod, under the conductor and the grounding system is connected to the connector with the composition. The grounding system is usually used as reference to the power and ground yellow-green safety ground wire is shared. The blocking range of    cell phone jammer      relates to the distance between it and the base station.Ground lightning discharge only in terms of facilities and equipment do not have this requirement. 3) Electromagnetic Compatibility ground: design for electromagnetic compatibility requirements of the ground, including: * Earth Shield: In order to prevent the parasitic capacitance between circuits because there is mutual interference, the circuit of the external electric field or electric field of radiation-sensitive, must make the necessary isolation and shielding, the isolation and shielding of the metal must be grounded.