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2023

How can a mobile signal blocker interfere with your phone signal?

Mobile phone signal blockers have become standard equipment in exam rooms, not only for the middle and high school entrance exams, but also for graduate exams, civil service exams, and various qualification certificate exams. Mobile phone signal blockers are required to prevent candidates from communicating with the outside world through wireless signals. In the exam room where Da Zhan Electronics' mobile signal blocker is used, various mobile signals (2345G), wireless intercom signals, Bluetooth WiFi signals, etc. will be blocked by interference.
So let's talk about mobile signal blockers, why can they interfere with your phone signal?
We can temporarily compare a mobile phone to a radio. The radio often experiences noise or channel confusion, which means the signal is interfered with. Since the radio can be interfered with, the phone can also be interfered with naturally and through some devices.
There are many different names for mobile signal blockers, including blockers, mobile phone blockers, signal blockers, mobile phone signal jammers, mobile phone signal blockers, mobile phone isolators, mobile phone blockers, mobile phone signal blockers, mobile phone jammers, signal jammers, mobile phone blockers, signal blockers, mobile phone signal isolators, signal isolators, mobile phone signal blockers, Wireless signal shielding device.
It analyzes the required shielding frequency for the uplink and downlink channels of mobile phone systems using techniques such as frequency doubling, frequency division, and frequency hopping filtering; Customize a spherical shielding space based on the power size of the shielding device, automatically forming a shielding magnetic field within the specified range, causing mobile phones (including PHS PHS GSM China Unicom, China Mobile, CDMA China Telecom) to fail in this space. When the shield is in operation, it can disable the signal sending and receiving functions of mobile phones within the specified range, making it impossible to dial out or in, thus achieving the goal of mandatory disabling.
The principle of wireless communication: Within a certain frequency range, mobile phones and base stations are connected through wireless electromagnetic waves to transmit data and sound at a certain baud rate and modulation method.
The communication principle of a mobile phone signal blocker is that the blocker scans from the low end frequency of the forward channel to the high end at a certain speed during operation. This scanning speed can cause garbled interference in the message signal received by the phone, and the phone cannot detect normal data sent from the base station, making it unable to establish a connection with the base station. Mobile phones exhibit phenomena such as searching the internet, no signal, and no service system.
Since we know that wireless communication uses electromagnetic waves for communication.
The functional characteristics 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. The basic principle of mobile phone interference devices is to transmit the same RF signal as the mobile phone. Due to the same frequency, mobile phones cannot distinguish which signal is a conventional base station signal, thus achieving "interference". As long as there is a machine with the same frequency as the phone, when the base station attempts to connect to the phone, it will emit a lot of "noise". You will find that signals from your phone are unrecognizable, so you will refuse to communicate with your phone.
In the early days, jammers only blocked a set of frequencies, such as 2G, while complex jammers could simultaneously block several types of networks, such as 2-3-4-5G. So how is this multi network interference achieved?
Actually, it's simple. That is to say, the interference bands corresponding to these three signals are repeated in a cyclic manner, while covering these three interference bands. The interval between these cycles is very small, so that the phone has no chance to speak and can only sit quietly and make a brick.
Covering 2/3/4/5G, what about Bluetooth and WiFi? It's okay, it can be easily handled.
The jammer has once again evolved, adding the frequency bands of Bluetooth and WiFi to the scanning range, thus completely covering the common communication methods in society.
Many people are unaware of the differences between Bluetooth, Wi Fi, and mobile data, which seem to be wireless communication technologies. In fact, the main difference between them lies in the frequency band. In mobile communication technology, 2G mainly operates in the 900-1700MHz frequency band, 3G operates in the 1900-2100MHz frequency band, 4G operates in the 2300-2500MHz frequency band, and 5G operates in the 3400-3600MHz frequency band. Bluetooth and WiFi operate at 2.4GHz.
In this way, the R&D engineers of Heisong Technology can accurately identify the communication frequency band and develop mobile signal blockers of the same frequency band, thereby achieving the goal of completely blocking mobile wireless signals, providing sacred assistance for education and safeguarding fairness and justice in exams!