cell phone jammer are the best products for blocking signals. It seems easy to set up a signal jammer. The following article explains how to set up a signal jammer.
Handy Jammer is an electronic device that blocks the transmission of signals between a mobile phone and a base station. When using the same frequency as a cell phone, the cell phone jammer generates strong interference for communication between the caller and the receiver. It efficiently blocks the transmission of signals from UMTS, 3G, CDMA, GSM and PHS.
Mobile phones work in different frequency bands in different countries. The 1900 MHz band is the primary band for German, especially for urban areas. 850 MHz is used as a backup in rural areas. In the US, 850 and 1900 MHz bands are used depending on the area. The Europeans use the GSM 900 and 1800 bands as standard. The Middle East, Africa, Asia and Oceania also use these frequency bands. In Russia and some other countries, local carriers have licenses for the frequency of 450 MHz to provide CDMA coverage.
Using different frequencies makes it difficult to have a jammer for all frequencies. However, the formula below can be used to calculate the required values.
F = 1 / (2 * pi * sqrt (L1 * C1))
Depending on the frequencies to be blocked, the values of inductance (L1) and capacitor (C1) can be changed.
For example, if cell phones in your area are operating at 450 MHz, you need to generate 450 MHz with some noise to act as a blocking signal. Now the cell phone receiver will not be able to understand which signal to receive. We successfully blocked cell phone signals.
Here 450MHz is the tuning frequency. High-performance cell phone blockers for other frequency ranges have a similar structure. However, the signal range is very weak. This circuit only works for a range of 100 m.