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Explanation of common problems of mobile phone signal jammer

Dojammer 2021-11-05

The greater the power of the cell phone signal jammer, the better the effect? , In fact, this is not the case. For example, if a space is about 400-500 square meters, it is necessary to choose a mobile phone signal jammer that shields about 600 square meters. It's not that the bigger the power, the better. After all, the power of the mobile phone signal jammer has a safe power range. Some customers said why most of the merchants’ machines have poor shielding effects when the signal source is very close, while some merchants have very good results. In fact, the poor signal shielding effect when the signal source is close actually proves that these The business is a legitimate business. To comply with safety is the power range. On the contrary, when the signal source is very close, the shielding effect is very good, and the power is good. It is good to pay attention to these machines, because such machines have exceeded the safe power of normal use. Not only will it affect the upstream signal source, but there are also potential safety hazards, so customers who purchase should pay attention. Therefore, the power of the mobile phone signal jammer is not as large as possible.

Several parameter issues that are helpful to the shielding effect of mobile phone signals:
1. Output power
①The output power of the shield
②The performance of antenna radiation (antenna gain, directivity, etc.)

2. How the shielding works
Nowadays, mobile phones are all digital signals, and the anti-shielding ability of digital signals is very strong. Generally, the effect of shielding digital signals with analog signal technology is poor. Therefore, digital signals must be used to shield digital signals. The shielding effect is quite different. The shielding device using digital shielding signal technology has lower power and higher efficiency than the shielding device using analog signal shielding technology.

3. Indoor and outdoor are different
The synthesis, attenuation, and reflection analysis of indoor mobile phone signals and shielded signals is very complicated.

4. Before being shielded, the strength and quality of the mobile phone signal in the local space have a great influence on the shielding. Different mobile phones have different effects. Generally, the anti-shielding effect of mobile phones with strong ability to receive weak signals may not be good.

5. The direction and distance of the signal source and the direction of the shielding area of ​​the mobile phone also affect the shielding effect.

6. Shielding distance and the characteristics of radio signal transmission distance. Now the shielding distance is briefly discussed in terms of the attenuation of radio signal transmission in free space. According to the transmission theory formula, the signal strength is attenuated by 6db every time the radio wave transmission distance is doubled (the signal power is reduced by 4 times) ). Then we take a mobile phone signal jammer GSM 900MHZ as an example. If the mobile phone signal strength in a certain area that needs to be shielded is -50dbm, and the effective shielding distance of the jammer is 10 meters, the change of the mobile phone signal strength will directly affect the shielding distance. .

①Generally, the signal strength in space is about -60 to -70dbm, and the highest within a few hundred meters of the base station can reach about -40dbm, and the mobile phone reception strength range is generally between -35 to -95dbm.

②The higher the signal power of the space mobile phone, the shorter the shielding distance.

The above discussion is based on the conclusion drawn based on the law of radio signal transmission in free space (so-called free space is similar to space). In reality, there are many obstacles on the ground that affect the transmission of radio waves. The above conclusions can only be qualitatively used as a reference, especially The above rules are very different from the actual indoors. Therefore, it is difficult to calculate this problem accurately at the moment, and can only be determined based on the actual situation on site. Accurate construction projects must carry out preliminary research and signal testing, and then design specific solutions, and then require timely follow-up testing and make certain corresponding supplements to be foolproof, that is, to achieve the effect of strict shielding.