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In which frequency bands does the mobile phone jammer need to add synchronization technology to avoid interfering with the base station?

In which frequency bands does the mobile phone jammer need to add synchronization technology to avoid interfering with the base station?

  • 2022-10-12

There are many kinds of mobile phone jammers on the market today, and most of them are realized by means of broadband white noise power suppression. During its use, there are many types of shielding devices that more or less interfere with the surrounding mobile phone base stations. This kind of interference is mainly aimed at the interference of the uplink signal of the base station, and the method to solve this interference problem is actually not difficult. It only needs to add signal synchronization technology to the interference signals of some specific frequency bands. So, in which frequency bands does the mobile phone jammer need to add synchronization technology to avoid interfering with the base station?

The frequency band targeted by the synchronization technology mentioned here refers to the mobile phone frequency band using time division duplex, while the other frequency division duplex mode is used to strictly distinguish the range of the uplink frequency band and the downlink frequency band. We use the frequency band of GSM900. For example, the uplink frequency range of GSM900 is 885-915MHz. In this frequency range, only data transmission of uplink signals is performed. The downlink frequency range of GSM900 is 930-960MHz. In this frequency range, only data transmission of downlink signals is performed. These two frequency bands do not overlap with each other, and data communication goes its own way. Let's take the time division duplex frequency band as an example, such as the TD-SCDMA frequency band, the frequency range is 2010-2025MHz, and the overall bandwidth is 15MHz, but because of the time division duplex technology, both uplink data and downlink data are in this 15MHz bandwidth. For transmission, it is only divided by time, that is, it is dedicated to uplink data in a period of time, and dedicated to downlink data in the next time period.

We use the upper synchronization technology in the mobile phone jammer, which is to synchronize the time division duplex frequency band, so that the signal shielding module for time division duplex only transmits the interference signal when the base station performs downlink signal data processing. On the contrary, when the base station When processing uplink data, the corresponding frequency band of the mobile phone jammer stops working.

We have sorted out and counted the frequency bands of time division duplex used by various operators at present. Now there are mainly 5 frequency bands using time division duplex technology, namely: China Mobile's 1885-1925MHz, 2010-2025MHz and 2510-2690 These three frequency bands, as well as the 2300-2390MHz for indoor signal amplification and the 5G-NR frequency band of China Telecom and China Unicom, namely 3400-3600MHz.

Based on the above analysis, when we add signal synchronization technology to all the five frequency bands built in the mobile phone jammer, we can completely avoid interfering with the uplink signal of the mobile phone base station.


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