How does the jammer in the examination room achieve signal shielding?
1. During the working process, the cell phone signal blocker will scan from the low-end frequency of the forward channel to the high-end at a certain speed. The scanning speed can cause garbled interference in the message signals received by the mobile phone, causing the mobile phone to be unable to detect normal data sent from the base station, making the mobile phone unable to contact the base station, thus achieving the purpose of blocking mobile phone signals.
2. Use the frequency emitted by itself to interfere with the mobile phone receiving the frequency emitted by the base station and wireless router, thereby achieving the purpose of blocking the mobile phone signal.
3. Within a certain frequency range, mobile phones and base stations are connected through radio waves, and a certain baud rate and modulation method are used to transmit data and sound. During this working process, the mobile phone signal jammer will scan from the low-end frequency of the forward channel to the high-end frequency at a certain speed.
4. The functional characteristics of electromagnetic waves are determined by the frequency of the mobile phone signal jammer. Therefore, the mobile phone must emit electromagnetic waves that meet the requirements so that it can connect to the communication operator's base station. The signal jammer emits the same radio frequency as the mobile phone. Because the frequency is the same, the mobile phone cannot distinguish which signal is the normal base station signal, thus achieving the purpose of interference. A loop method is adopted to repeatedly play the interference bands corresponding to the three signals and cover up the three bands at once. Due to the small distance of this loop, the mobile phone has almost no chance to speak.
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