Why can wireless signal jammers block mobile phone signals?

Many users of wireless signal jammers often lack understanding of their working principles, resulting in improper use and unsatisfactory results.

The working principle of wifi jammers is that wireless devices (such as mobile phones) and base stations communicate through radio waves within a specific frequency range. This communication allows data and sound to be transmitted at a specific baud rate and modulation method. During mobile phone communication, the device uses the uplink frequency to interact with the base station, which then transmits the signal to the mobile service switching center to complete the call. In standby mode, the mobile phone communicates with the base station through a broadcast control channel. When a call is initiated, a dedicated channel is allocated to the mobile phone based on the channel conditions near the device. The mobile phone then switches to the allocated channel to establish the call and transmit data. Effective wireless communication requires a sufficient signal-to-noise ratio for successful reception and communication.

Based on this working principle, wireless signal jammers are usually composed of a power supply, an electronic scanning control unit, a segmented RF module unit, an amplifier unit, a transmitting antenna unit, etc. The signal generator generates a scanning signal, which enters the oscillator through an inverter and is modulated in the oscillator to match the mobile communication working frequency band. The modulated signal is then amplified by a power amplifier and controlled by a voltage regulator. The amplified sweep signal is transmitted into the air in the form of radio waves. The frequency sweeping signal interferes with and distorts the information signal received by the mobile phone, making the proportion of the noise signal higher than the device threshold, causing the mobile phone to be unable to receive the normal data sent by the base station and unable to establish a normal connection, resulting in interruption of communication between the mobile phone and the base station, and symptoms such as no signal and no service system on the mobile phone, effectively blocking the connection.

The interference power of the wireless signal jammer is certain, and its blocking range in the unobstructed space depends on the path attenuation and the strength of the signal received by the base station. To interfere with the mobile network, the signal field emitted by the jammer must be greater than the field strength of the mobile signal in the interference area. The effective interference range varies with the distance between the interference point and the base station. The closer the interference point is to the base station, the stronger the field strength and the smaller the effective interference range; conversely, the farther the interference point is from the base station, the weaker the field strength and the larger the effective interference range. Best-selling cell phone jammers and GPS jammers in Europe and America.

It should be noted that under a certain transmission power, the interference range is determined by the field strength of the interference area. No matter how powerful the wireless signal jammer is, if the transmission power remains unchanged, the interference signal strength will gradually decay with the increase of distance, and eventually lose its interference ability.

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