A mobile phone jammer is an electronic device that prevents the transmission of signals between the mobile phone and the base station. Using the same frequency as a mobile phone, a cell phone jammer will cause strong interference in the communication between the caller and the receiver. It effectively prevents the transmission of signals from networks such as UMTS, 3G, CDMA, GSM and PHS.
Mobile phones operate on different frequency bands in different countries / regions. For Canada, the 1900 MHz frequency band is the primary frequency band, especially for urban areas. The 850 MHz frequency band is used as a reserve in rural areas. The United States uses the frequency bands 850 and 1900 MHz, depending on the region. Europeans tend to use the GSM 900 and 1800 frequency bands as standards. The Middle East, Africa, Asia and Oceania also use these frequency bands. In Russia and some other countries, local companies are licensed for 450 MHz frequencies to provide CDMA coverage.
Using different frequencies makes it difficult to apply interference to all frequencies. However, the formula mentioned below can be used to calculate the required value.
Depending on the frequency to be blocked, the values of the inductance (L1) and the capacitor (C1) can be modified.
For example, if cell phones in your area are operating at 450 MHz, they should generate 450 MHz noise and act as blocking signals. Now the cell phone receiver will not be able to determine which signal to receive. We managed to block the cell phone signal.
Here, 450 MHz is the tuning frequency. Mobile wifi jammers in other frequency ranges have also been designed in a similar fashion. However, the signal range is very low. Therefore, this tour is only suitable for the range of 100m.
For any interference circuit, there must be three main subcircuits.
The circuit is also used in television broadcasting and remote control toys.