Why do the current signal blocker use the mode of frequency sweeping and then jamming to jam the signal?

The communication principle of the signal blocker, the jammer device 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 message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc.

Now that we know that the communication method of wireless communication is to use electromagnetic waves to communicate.

The functional properties of electromagnetic waves are determined by their frequency. Different communication systems use different frequencies, so that everyone is at peace and does not interfere with each other.

In the early days, signal blockers only blocked a set of frequencies, such as GSM, while complex signal jammers can block several types of networks at the same time, such as GSM/3G/4G/5G.

So how is this multi-network signal jamming achieved? What's the downside of it?

1. For the actual combat scene of bomb disposal and EOD, if the frequency jammer first scans suspicious frequency points and then activates the jamming signal to suppress, there will be a time difference, even if the gap of the time difference reaches the microsecond level, once there is jamming to suppress the remote control signal If it is not in time, the bomb will be detonated in advance, and the consequences will be extremely serious.

2. The current remote control interference technology can achieve broadband frequency hopping, or multi-frequency remote control. When there is a multi-frequency and frequency-hopping wireless frequency band, if the signal blocker first sweeps the frequency and then outputs the bandwidth, it will be blocked. Significantly widening, shielding or interference suppression distance will be greatly reduced.

3. In addition, if terrorists use mobile phones to communicate during the communication process, or use mobile phones to detonate remotely, etc., the frequency sweeping method cannot identify and discover all the mobile phones, even if all the shielding modules of the signal blocker are manually turned on, Its bandwidth will be stretched too wide, and the distance of interference shielding will be close to zero. Everyone understands: the current mobile phone frequency ranges from 800MHz-5900MHz, and there will be 6G frequencies in the future, and even wider frequency bands....

4. Regarding the signal jammers mentioned by others, the energy consumption is relatively large, and the energy consumption is relatively low if the interference is performed after sweeping the frequency. In fact, the amount of energy consumption is related to preventing a terrorist incident. In contrast, it is completely insignificant when it comes to safeguarding life safety.