Home Technology Cell phone signal jammer

Cell phone signal jammer



Introduction

According to our understanding, mobile phone signal jammers on the market can limit mobile phone signals that are 500M meters away from the launching station and have a radius of >20 meters. The shielding radius is adjustable, it only shields mobile phone signals without affecting other electronic devices. Save electric energy, the power is 20W-480w.

When the mobile phone works, it is within a certain frequency range. The mobile phone and the base station are connected by radio waves, and the data and sound transmission are completed with a certain baud rate and modulation method. Aiming at this communication principle, the mobile phone signal jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. The mobile phone is manifested as a search network, no signal, no service system and other phenomena.

The common mobile phone signal jammers on the market have operating frequencies: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The operating frequency bands are CDMA800, GSM900, DCS1800, PCS1900, WCDMA, etc. It can control a range of about 40 meters in diameter, using DC-DC converter input voltage and 5V output voltage.

Basic functions

1 Slow start function

After the shield is energized, the working power supply rises from zero to stable within 4 seconds.

2 Shielding function

After the activation is completed, the mobile phones within the range of action will be shielded within 35 seconds.

Basic performance:

Transmission frequency range: 860-960MHZ1.800-1.990GHZ

Functional frequency bands: CDMA800, GSM900, DCS1800, PCS1900, PHS.

Control range: about 40 meters.

Features

Effectively shield all kinds of walkie-talkie signals, block (interference) the communication between the walkie-talkie and the receiver, and make various types of wireless stealth grafted to the walkie-talkie system Earphones (including anti-shielding and anti-detection earphones) can’t work normally (strong noise or no sound)

Only shield the walkie-talkie signal, does not affect the normal operation of other electronic equipment

Green environmental protection, electromagnetic The radiation amount has been strictly tested by the "Environmental and Health Related Product Safety Institute of the Chinese Center for Disease Control and Prevention" (the unit is a national authoritative certification body that detects electromagnetic radiation). The electromagnetic field intensity measured at each sampling point is far lower than the "Electromagnetic Radiation" Protection Regulations" (GB8702-88), no impact on the human body

Low power, only shielding the intercom or receiver signal in the examination room, does not interfere with the built-in switching power supply of the intercom outside the examination room, ensuring the stability of the signal, Accuracy

Easy to operate, install the antenna correctly, and it will run automatically after turning on the power

Technical indicators:

Effective shielding range: 20 meters (transmitted 5W The walkie-talkie is 100 meters away from the examination room)

The smaller the power of the walkie-talkie and the farther away from the examination room, the greater the shielding range.

Transmit frequency range: full frequency band

Power: 3W

Ambient temperature: -20―+55°C

Relative humidity: 35-85%

Power adapter: input AC160-240V50/60Hz

Body size: 210mm*139mm*50mm

Net weight: 1Kg

Applicable places

1. The communication signal of the border operator Protection

2. Army combat needs

3. Detention centers, labor reform teams, large and medium-sized prisons

4, large gathering places

5 , Leaders’ visits to safety precautions

6, college entrance examination, adult college entrance examination, self-study examination and various colleges and universities

7, party and government agencies, various large, medium and small meeting rooms of enterprises, Concert halls, theaters

8, gas stations, oil depots, oil fields, gas stations and other flammable and explosive places

How to use

1. Select the area that needs to cut off the mobile phone signal, and place the cutoff on the desktop or wall in this area.

2. After the installation is complete, turn on the power of the disconnector and turn on the power switch.

3. After the equipment is connected, press the power switch and the disconnector to work. At this time, all the mobile phones turned on at the scene are in the state of searching the network, and the base station signal is lost. Both the caller and the caller cannot establish a call connection.

Introduction to the principle of mobile phone signal jammer (mobile phone signal interceptor)

According to the above-mentioned communication principle, the mobile phone jammer works from the low end frequency of the forward channel at a certain speed. Scan to the high end. This 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 is manifested as the phenomenon of searching the network, mobile phone no signal, no service system and so on.

Question answer

1. Why is the shielding range different from the description in the manual when the shielding device is working?

Answer: The shielding range of the shielding device is related to the strong electromagnetic field at the shielding site, and is related to the distance from the communication station. Generally the best is 200 meters away. The manufacturer has tested it under normal conditions, so the shielding range will be slightly different.

2. Will there be radiation when the cell phone signal is shielded, and is it harmful to the human body?

A: Regarding radiation, as long as electronic products are large and small, there will be radiation. Any piece of electrical equipment will have radiation. Just like the mobile phones we usually use, it is inevitable that there will be radiation when leaning against our ears every day. The country has also set a standard for mobile phone radiation, and the radiation generated by our mobile phone signal jammers is much lower than the national standard, and it is not every day. Lean against the ears, so there is almost no harm to the human body.

This article is from the network, does not represent the position of this station. Please indicate the origin of reprint
TOP