How are cell phone jammers used in prisons
Our understanding of mobile cell phone jammer probably knows that mobile phone signal jammers can interfere with mobile phone signals. They are used in the examination room to prevent candidates from cheating with mobile phones. It is not clear how signal jammers work and the types of signal jammers.
According to the appearance, signal jammers are divided into built-in antenna jammers and external antenna jammers. The shielding device of the external antenna is a metal shell, and the built-in antenna is a plastic shell. According to the use area and the used area, it can be divided into low power Mobile phone jammers and high-power jammers, if used outdoors, the distance between the floors is relatively long, it is recommended to use high-power mobile phone jammers.
The working principle of the signal jammer is to scan from the low end frequency of the forward channel to the high end at a certain speed during the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone. The mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station and achieve the purpose of shielding the mobile phone signal. No service system and other phenomena.
Generally speaking, the frequency emitted by the mobile phone jammer interferes with the normal frequency of the mobile phone receiving the base station, making the mobile phone unable to connect to the base station, and thus unable to make calls, receive and send text messages and surf the Internet normally. When the mobile phone signal jammer is turned on, although the mobile phone will have a full signal, there is no signal in actual use.
When the mobile phone jammer is turned on, it only has a shielding effect on the mobile phone, and has no effect on other electronic devices. This is because the electromagnetic signals emitted by the mobile phone signal jammer are completely within the collection working frequency band prescribed by the country, which will only block the communication of the mobile phone. And this signal is always in a relatively static state and will not affect any electronic equipment.
Mobile jammers are not only used in school examination rooms, but also in confidential meeting rooms, prison detention centers, troops and other places. Especially prisons must be equipped with jammers. In order to prevent prisoners from contacting the outside world, mobile phones are not allowed. If cell phone jammers are used in prisons, it is recommended to use signal jammers of large and small power. When the shielding is busy, you can use low-power jammers, and you can use high-power jammers in large areas.