Cell phone jammer has gain the support from the China Mobile

cell phone jammer has gain the support from the China Mobile
C-level shielded room at 0.01 ~ 1000MHz effective electric field and plane wave screen no less than 110dB, (1 ~ 10GHz) microwave-screen effect not less than 100dB, (0.01 ~ 1 MHz) magnetic field screen effect by the 55 ~ 110 dB. In comparison, GJBz20219-94 requirements of the shielding effectiveness, C-class to be strict in GJB2926-97. cell phone jammer has gain the support from the China Mobile, China Unicom and radio management committee and so on.Generally speaking, meet GJB2926-97 shielding requirements to meet the EMC shielded room is the subject of military standard certification testing environment and the people required. Shielded room at home and abroad the manufacturer's design and manufacturing level can be reached GJBz20219-94 C-level shielded room requirements. Shielded room of foreign standards EN50147-1, GAMT20, NSA65-6, MIL-STD-285, IEEE299 and so on. 2.2 e-shelter's efficiency requirements of the domestic electronic screen module of shielding performance requirements are: 10kHz ~ 1GHz internal display efficiency of not less than 40dB.Here is the prison cell phone jammershielding need analysis and solution. Some vendors can reach 60dB. 2.3 electrical and electronic equipment enclosures, screen enclosures efficiency requirements GJB5240-2004 "military electronic equipment cabinet enclosure shielding effectiveness of general requirements and test methods" based on the use of its chassis and rack panel is divided into four efficiency, shown in Table 1. For the general case in which a rack, 2 rack chassis for general reinforcement, . 2.5 Conducting the window openings for video display, such as cathode ray tube (CRT) and digital display, etc., are usually extremely difficult to shield because this type of display requires a high degree of light, so they need a special designed conductive window.mobile phone jammer is recommended to be installed around every prison zone.  Conductivity up to see the window there are two types: (1) translucent conductive coating; (2) wire mesh screen. 2.6 conductive gasket conductive gasket market efficiency for a typical screen 80 ~ 100 dB. 3 to achieve shielding effectiveness of shielding purpose is to not want the electric field, magnetic field restricted to a range of other devices will not produce electromagnetic interference. Given this promising field, differences in the nature of the magnetic field, the application of shielding mechanisms are also different. This usually will not want to produce the electric field, magnetic field interference source is divided into three kinds. The first is the constant electric field, the electrostatic charge and produce a constant DC, this time to suppress electrostatic shield; the second magnetic field is constant, by the permanent magnet and generate a constant DC, this time to curb the use of magnetic shielding; third is time-varying electromagnetic fields, .