Prison Mobile Phone Signal Interference Solution-Solutions-ZHEJIANG JEC ELECTRONIC CO., LTD.

Prison Mobile Phone Signal Interference Solution

Brief Introduction

With the continuous development and popularization of mobile phones, the technical level of personal mobile communication methods has improved significantly, especially after the popularization and application of 3G and 4G technologies, the negative impact on prisons, detention centers and other similar fields has become more and more prominent. In prisons, detention centers and other supervision areas, not only prisoners but also guards are prohibited from using mobile phones or other means of communication. Once the mobile phone is brought into the prison and put into use, it will bring great harm to the management and security of the prison. Some prisoners use illegally smuggled mobile phones to call, send text messages, obtain information, threaten witnesses, and even organize gang escapes. Therefore, it is particularly urgent to install mobile phone signal shielding system in prisons and other supervision areas.

Our company has successfully developed a series of mobile phone signal jammers by using advanced electronic jamming technology with independent intellectual property rights. The device can effectively shield the mobile phone signals, prevent all personnel in the prison from illegally communicating through the mobile phone, and provide technical guarantee for prison management and security.

Scheme Introduction

(1) System Composition

The system is mainly composed of the main control system and the jammer. The main control system consists of the control computer, controller and controlled terminal. The interference terminal is composed of MPB30 series portable mobile communication jammers, MBB200 series mobile communication jammers and MBB800 series mobile communication jammers.
(2) Function

(a) The operating frequency covers all modes of 2G, 3G and 4G communication, and the operating frequency can be customized according to requirements.

(b) The coverage can reach more than 300 meters. (The coverage area is determined by the field strength of local base station)

(c) The jammer can be controlled by the host through the network, and can be independently controlled according to requirements.

(d) Medium-power jammers and high-power jammers use directional antennas to reduce the impact on surrounding environment.
(3) Product Features

(a) Using advanced interference technology and adopting special interference mechanisms for different communication methods can achieve good interference effects.

(b) Advanced antenna technology can provide multiple types of antennas to match the actual application, greatly reducing the impact on the surrounding environment.

(c) The advanced network remote control technology can control the jammer independently according to requirements.

(d) The manufacturing technology is advanced, and outdoor equipment is rainproof and dampproof. It has good heat dissipation performance, and can work at -20 ~ + 55℃.

(e) Excellent reliability design, can continuously work 24 hours a day.

(f) Excellent scalability, the system has the ability to expand to meet the needs of future upgrades.

(g) The system can be customized according to customers’ requirements and actual field research.

Product Specification

(1) MPB30 series portable jammer

Model	MPB30 series mobile communication jammer (Indonesia band)
Operating frequency	1) 2G band CDMA800: 869~894MHz; GSM900: 925~960MHz; DCS1800: 1805~1880MHz. 2) 3G band WCDMA/CDMA2000: 2110~2170MHz. 3) 4G band FDD-LTE：925~960MHz/1805~1880 MHz; TD-LTE：1880~1900 MHz/2300~2400 MHz.
Transmit power	≥30w
Antenna	Omnidirectional or directional antenna
Voltage	220VAC±20%，50/60Hz
Weight	≤3Kg
Operating temperature	-20 ~ +55℃

(2) MBB200 series medium-power jammer

Model	MBB200 series mobile communication jammer(Indonesia band)
Operating frequency	1)2G band CDMA800: 869~894MHz; GSM900: 925~960MHz; DCS1800: 1805~1880MHz. 2)3G band WCDMA/CDMA2000: 2110~2170MHz. 3)4G：4Gband FDD-LTE：925~960MHz/1805~1880 MHz; TD-LTE：1880~1900 MHz/2300~2400 MHz.
Transmit power	≥150w (adjustable)
Antenna	9-11dBi directional antenna (Pol ±45°)
Voltage	220VAC±20%，50/60Hz
Weight	≤30Kg
Operating temperature	-20 ~ +55℃

Typical field pattern of medium frequency interference antenna

(3) MBB800 series high-power jammer

Model	MBB800 series mobile communication jammer(Indonesia band)
Operating frequency	1) 2G band CDMA800: 869~894MHz; GSM900: 925~960MHz; DCS1800: 1805~1880MHz. 2) 3G band WCDMA/CDMA2000: 2110~2170MHz. 3) 4G band FDD-LTE: 925~960MHz/1805~1880 MHz; TD-LTE: 1880~1900 MHz/2300~2400 MHz.
Transmit power	≥800w (adjustable)
Antenna	13-15dBi directional antenna (Pol ±30°)
Voltage	220VAC±20%，50/60Hz
Weight	≤100Kg
Operating temperature	-20 ~ +55℃

Typical field pattern of high-power jammer antenna

Implementation Case Introduction

Medium-power Jammer

Eight medium-power jammers are set at the position of the sentry box and the center of the four-sided high wall, which can basically cover the monitoring area; still there will be coverage blind areas in the middle and interleaved positions of the monitoring area. Therefore, it is necessary to increase the portable jammers to fill the blind spots according to actual test situation.

According to application experience, 8 medium-power jammers and 12 portable jammers need to be configured.
High-power Jammer

Four high-power jammers are set at the position of the sentry box, which can cover most of the monitoring area. Because the buildings in the monitoring area are mainly made from reinforced concrete, signal transmission is blocked, and blind spots may occur in some places. Therefore, it is necessary to increase portable jammers to fill the blind spots according to the actual test situation.

According to general application experience, 4 high-power jammers and 8 portable jammers need to be configured.

Control range and its impact on surrounding areas

Portable jammers are generally used indoors, and the monitoring area covers a range of 10-15 meters, which will not affect anywhere outside the high wall.

Medium-power jammers and high-power jammers are used for large-area outdoor and indoor coverage. Due to the large number of monitoring rooms in the monitoring area, interference signals need to spread through the walls, resulting in great signal attenuation. Therefore, the coverage of medium-power jammers generally is about 30-50 meters, while the coverage of high-power jammers is about 80-120 meters. (The coverage area is determined by the field strength of local base station).

The impact of this outdoor equipment on the surrounding environment is due to the reverse radiation of the antenna, so we use the directional antenna to ensure the directivity of the interference signal. As can be seen from the typical antenna field diagram, the equivalent radiated power on the back of the medium-power directional antenna is about 1/30 of the front of the antenna, and the equivalent radiated power on the back of the high-power directional antenna is about 1/100 of the front of the antenna.

The equivalent radiated power of the medium-power jammer is about 1kw, and the backward equivalent radiated power is about 33w. According to the calculation of the general base station field strength, if the backward is completely empty and without obstacles, the affected distance is about 10-15 meters. Generally, the high wall of the prison is behind the antenna installation, so basically it will not affect the outside.

The equivalent radiated power of the high-power jammer is about 10kw, and the backward equivalent radiated power is about 100w. According to the calculation of the general base station field strength, when the backward is completely empty and unobstructed, the affected distance is about 20-30 meters. Generally, the high wall of the prison is behind the antenna installation, so it has little impact on the outside.

The control range and the impact on the surrounding environment are closely related to the local base station field strength and antenna installation location. In the specific implementation process, the external radiation influence of the antenna can be controlled by some methods such as adjusting the antenna beam range, installing the antenna pitch angle, and adding the antenna reflector.