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source:Industry News release time:2021-04-09 Article author:sznbone Popular:Prison Jamming system
The working principle of the machine signal jammer (as known as mobile phone signal screen blocker, mobile phone signal jammer, standardized test room signal jammer, wireless signal jammer) is as called the scanning signal generated by the sawtooth wave signal generator is inverted by the inverter Then, it enters the voltage-controlled oscillator to modulate the three frequency bands with the same downlink frequency of CDMA, GSM, and PHS. The modulated sweep signal is amplified by the power amplifier, and the power of the power amplifier is controlled by the voltage regulator tube. The amplified sweep signal is The form of radio waves is launched into the air. Because the frequency sweeping signal forms garbled interference in the message signal received by the mobile phone, the mobile phone cannot receive the normal data sent by the base station, so that the mobile phone cannot establish a normal connection with the base station, and the mobile phone is separated from the communication network of the base station. The mobile phone displays the phenomenon of no signal and no service system in the search network, and achieves the blocking effect. It does not rely on unlimited increase of power to compete with the mobile phone base station to achieve the blocking effect.
The electromagnetic signal intensity which is emitted by the mobile phone signal jammer ,lt is very weak. As long as the qualified products produced by the regular manufacturers, the electromagnetic radiation intensity of the Dartdi mobile phone signal jammer has passed the national authoritative testing and certification organization, such as (The Electronic Security Alarm System Testing Center of the Ministry of Public Security) , Strictly tested by the Environmental and Health Related Product Safety Institute of the Chinese Center for Disease Control and Prevention, the measured values of electromagnetic field intensity at all sampling points are lower than the relevant frequency band standard of the "Electromagnetic Radiation Protection Regulations" (GB8702-88) formulated by the State Environmental Protection Administration The limit value (this standard is only 1/5 of the European standard and 1/10 of the Japanese standard) will not cause harm to the human body, so there is no need to panic. The unnecessary psychological burden is the real obstacle.
The power of the mobile phone signal jammer is very small (≤1W), and the range is about 20 to 30 meters. It will not cause interference to the mobile phone base station at all. Moreover, when used in specific occasions, there is no question of harming public information security. The frequency of the electromagnetic signal sent by it falls completely within the working frequency band of the mobile phone specified by the country, and this signal is always in a relatively static and constant state, and will not affect any other electronic equipment.
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