Working principle of wireless mobile phone signal shielding device

　　The working principle of mobile phone signal shielding device (also known as mobile phone signal screen blocker, mobile phone signal jammer, standardized examination room signal shielding device, wireless signal shielding device) is as follows: scanning signal generated by sawtooth wave signal generator is inverted by phase inverter, and then enters voltage controlled oscillator to modulate in three frequency bands with the same downlink frequency of CDMA, GSM and PHS The power of power amplifier is controlled by voltage regulator tube, and the amplified sweep signal is transmitted to the air in the form of radio wave. Due to the random code interference caused by the sweep signal to the received message signal of the mobile phone, the mobile phone can not receive the normal data from the base station, which makes the mobile phone unable to establish a normal connection with the base station, which makes the mobile phone leave the base station communication network. Mobile display search network has no signal, no service system and so on, to achieve blocking effect, does not rely on unlimited power increase and mobile phone base station competition to achieve blocking effect. The electromagnetic signal intensity emitted by the mobile phone signal shielding device is very weak. As long as the qualified products produced by regular manufacturers, the electromagnetic radiation intensity of datti mobile phone signal shielding device has passed the state-level authoritative testing and certification institutions, such as the electronic security alarm system testing center of the Ministry of public security, According to the strict inspection of Institute for environment and health related product safety of China Center for Disease Control and prevention, the measured values of electromagnetic field intensity at all sampling points are lower than the standard limit value of relevant frequency band specified in regulations on electromagnetic radiation protection (GB8702-88) formulated by the State Environmental Protection Administration (SEPA) (this standard only has 1 / 5 of the European standard and 1 / 10 of the Japanese standard), so it will not cause harm to human body, so there is no harm to human body Necessary panic, unnecessary psychological burden is the real obstacle.

　　Because the sweep signal interferes with the received message signal of the mobile phone, the mobile phone cannot receive the normal data from the base station, and the mobile phone cannot establish a normal connection with the base station, which makes the mobile phone leave the base station communication network. Mobile display search network has no signal, no service system and so on, to achieve blocking effect, does not rely on unlimited power increase and mobile phone base station competition to achieve blocking effect.

　　Company Profile

　　Vecano Electronics Company Limited was established by China Government in 2011, focusing on the development and marketing of Security and telecom products.

　　HISEA is a registered brand of Vecano Electronics Co.,Ltd. HISEA is the foremost innovator in the field of RF jamming. In countering the ever growing threat of remotely controlled improvised explosive devices (RCIEDs), Vecano has invested heavily in the development of a range of State-of-the-art. Vehicular Jamming system ,Portable/Tactical Jammers,Stationary jammer, Bomb jammers, Rf jammers,Cellphone jammers, Custom/Embassy Jamming Solutions, Portable Jammer system ,Prison Jamming system, Handheld Jammers Solutions and so on, for the protection of troop transportation, Military and Police checkpoints , large Governmental establishments, Bomb Disposal Squads and VIP convoys. Also, HISEA produce mobile signal booster/mobile amplifier/mobile repeater. Products widely used in blind zones of offices, family rooms, factories, bars, supermarkets, underground parking garage, etc, where the signal is very poor, or in spite of full mobile signals on the mobile phone, there is a break in voice leading to call clarity problem.

　　We have strong and excellent R&D group who dedicated to the research and development of our new products. They have used to work in leading companies in telecom industries, such as Huawei Technologies Co.,Ltd. We help customers achieve success, thinking highly of people in our company, pursuing excellence, contributing to our country and inheriting merits of innovative, diligent, precise

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What should I pay attention to when installing and using mobile phone signal shielding equipment?Mee