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What is the range of cell phone jammers?

What is the range of the cell phone jammer? This may be a question that many people will consider when purchasing a cell phone jammer. But the answer is uncertain, and it needs to look at the specific situation and analyze it.

The principle of the signal jammer is such that the jammer scans 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 received message signal of the mobile communication, and the mobile communication cannot detect the normal data sent from the base station, so that the mobile communication cannot establish a connection with the base station. Mobile communication is manifested as search network, no signal, no service system and other phenomena.

For example, the radio we usually listen to is FM88.3, ​​which tells the frequency of your city. Then, I can also get one with the same frequency, but this frequency of mine is illegal without reporting it to the local radio management committee. To interfere with your normal tape recorder frequency.

Mobile phone signal

For example, the high-power signal jammers used in prisons have a shielding radius of up to several hundred meters, while the low-power jammers suitable for examination rooms and conference rooms generally have a shielding radius of 1-10 meters, depending on the strength of the nearby signal base stations. .
High-power signal jammers (hundreds of W or even more than 1000W) have very strong shielding capabilities and are suitable for special occasions such as prisons and detention centers. But it is also because its shielding ability is too strong that if it is close to a residential area, it will inevitably affect the normal mobile phone call needs of the nearby people. Therefore, high-power signal jammers are generally used in places that are relatively open and far away from residential areas.

The shielding radius of low-power signal shields (generally 12W-20W) is between 1-10 meters, and the instructions of some products claim to be between 1-20 meters and 1-30 meters. In fact, the upper limit here is difficult. achieved.

This is because the shielding effect of the jammer mainly depends on the signal strength of the place where it is used. If multiple signal base stations are set up on the campus of a school, and the receiving level of the mobile phone is ≥-70dBm, the actual shielding of the shielding device will be greatly shortened, and it may only shield the distance of 2 or 3 meters.

If there is no base station in the campus and the mobile phone reception level is ≥-90dBm, the shielding effect of the mobile phone signal jammer will be very good. There is no problem in shielding the distance of 10 meters. It is enough to put one jammer in one examination room.

Therefore, the effective shielding range of the shield mainly depends on the following points:

1. The power of the signal jammer. There are many signal jammers on the market that are said to be 5W, but the actual power is less than 1W. So, it must be the actual power. For low-power signal shields within 1W, the shielding distance is about 1-10 meters, and the shielding range is 10-30 square meters. But what needs to be understood is that such a signal jammer cannot pass through walls.

2. The density of nearby base stations. Now many customers buy back signal jammers, 2G and 3G calls can be blocked, but 4G cannot be blocked. What is the reason? It is because there is a base station near you. Generally speaking, there is a base station within 100 meters. Buying a low-power signal jammer is basically useless, because the signal strength of the base station is too strong. It is recommended to buy a shield with a medium power, with a ratio of more than 2W per channel.

3. Field wall environment. What is the field wall environment? It is the place where the shielding device is installed, whether it is a cement wall or a glass partition. Ordinary shields have no effect if they pass through walls.

To sum up the above, the shielding range of mobile phone signal jammers is not solved by a single factor. It is recommended to use a field wall meter to test the signal strength of your installation environment before buying in large quantities.


Post time: 11-24-2022