When asked why the jammer cannot produce effective results, more money should be spent on the cell phone jammer, Prison Police Commissioner Bupendra Singh said: “When the jammer is close, the jammer can provide better results. Currently. , The jammer is placed far away and therefore cannot provide the desired result.

An jammer is a mobile communication device that transmits in the same frequency range as a mobile phone. It generates strong interference from the base station and prevents the transmission of mobile phone signals and calls.
Singh said: "In order to achieve better results, we have asked the Ministry of the Interior to transfer these signal jammer to three prisons to increase the concentration of jammers and achieve better results. This means that if certain prisoners pass Talking on the phone, you can hear a clearer and more audible voice."

I see more and more manufacturers want to add wireless technology to new or existing products or modify them. Products usually include mobile, household, industrial, scientific and medical equipment. In addition, the trend of "Internet of Things" (IoT) or Industrial Internet of Things (IIoT) has also exacerbated this problem. This transition to "wireless of all things" is in full swing and has caused electromagnetic interference problems. In other words, the EMI of the product itself will affect the sensitive car phones, GPS/GNSS and Wi-Fi/Bluetooth receivers (for example, wifi jammer) on board. This is the so-called "platform" or self-interference, which is a big problem for manufacturers.

Most digital products will generate a lot of car radio frequency "noise" (electromagnetic interference or EMI), generally will not interfere with the digital circuit itself, but will generate integrated switching power supply from the digital clock, high-speed data bus is easy to interfere. Interference occurs in the cell phone frequency band between 700 and 950 MHz, causing the receiver to "crash" (reducing receiver sensitivity). In order to use various mobile phone services (Verizon, ATT, Sprint, T-Mobile, and other services in the United States), manufacturers must pass very strict receiver sensitivity and transmitter power compliance tests, complying with CTIA standards, as described above. . This type of digital overhead noise usually delays product launch by weeks or months.