# What is the shielding effect after the power of the mobile phone signal jammer is doubled?

Conventional mobile phone signal jammers use white noise broadband transmission and rely on power to suppress interference to achieve signal shielding. With the rapid deployment of 5G base stations by various communication operators in recent years, the excessive density of base stations will cause customers to feel The effective distance of signal shielding becomes shorter. So some customers proposed to increase the transmission power of the shielding signal, and then the question arose: what is the shielding effect of the mobile phone signal jammer after doubling the power? Is it possible to double the shielding distance?

The final result is not what you want. For example: in a practical application, if the average transmission power of each output frequency band of a mobile phone signal jammer is 2W, use a mobile phone to test the effective shielding distance, assuming the result of the field test The radius of the effective shielding area is 10 meters. If we replace it with a mobile phone signal jammer with an average output power of 4W for testing, we will find that: first of all, it is almost impossible to double its effective shielding radius, that is, in this on-site environment, it is impossible to reach a radius of 20 meters. But at the same time, we can also find that compared with the original distance of 10 meters, after the transmission power is doubled, the effective shielding distance will increase, but it will not be obvious, and it may be increased to about 12 or 13 meters. Even sometimes it feels like there is no change, and it remains at a position of about 10 meters. Why?

The reason is that in the field of radio frequency communication, the unit we usually use to convert the "W" that represents the radio frequency output power into a level value becomes "dBm". The conversion formula is: if the power "W" is doubled, the level value should be increased by 3dBm. Still use the previous example to illustrate: when the output power is 2W, the corresponding level value is 33dBm, when the power is doubled and 2W becomes 4W, the corresponding level value is 36dBm, when the power is doubled, When 4W becomes 8W, the corresponding level value is 39dBm.

If the mobile phone signal jammer wants to achieve a completely stable shielding effect, it is usually required that the strength of the interference signal emitted by it, that is, the level value, should be at least 5~8dBm higher than the strength of the base station signal. In the real environment, due to the large number of base stations, there are many differences in the location and direction of the distribution, and considering the influence of other factors, in the test site of the mobile phone signal jammer, when we go to detect the signal strength of the base station, it is actually not fixed. It is not the same, but is in a state of beating and changing all the time. The signal of the base station is strong and sometimes weak, and the difference in beating may even reach more than 5dBm. Because of this, even if the transmission power of the mobile phone signal jammer is increased by one, that is, the level value is increased by 3dBm, but the increase range may still be within the range of the base station signal's change and jump, so, in the end It is difficult to see that the distance of signal shielding will be significantly improved.

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