Who sells GPS signal jammers?
At present, there are many GPS signal jammers on the market, and there are no good or bad ones. Some time ago, I purchased one from topsignaljammer and put it in the company's conference room. The effect is very good.
Everyone knows that the mobile phone signal will be blocked during the college entrance examination, so how much do you know about the mobile phone signal blocker? The editor will introduce the principle, characteristics, and problems of the mobile phone signal blocker to you.
Mobile phone signal jammer introduction
The mobile phone blocker can effectively block all mobile phone signals of CDMA (China Telecom), GSM (China Mobile, China Unicom), SCDMA (Netcom Dalingtong), DCS (1800MHz), PCS (1900MHz), PHS (Telecom PHS), and 3G. It is used in examination rooms, prisons, courts, meeting places, libraries, theaters, churches, gas stations, oil depots, gas stations, hospitals and other places that require confidentiality, quietness, riot control and interference prevention.
Introduction to the principle of GPS signal jammer
The working principle of the GPS jammer is as follows: within a certain frequency range, the mobile phone and the base station are connected by radio waves to complete the transmission of data and sound with a certain baud rate and modulation method.
According to the above communication principle, the GPS signal jammer scans from the low-end frequency of the forward channel to the high-end frequency at a certain speed during the working process. The 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 manifests as the phenomenon of searching the network, no signal, no service system, etc.
Features of cell phone signal jammers
1. Only shield the mobile phone signal, does not affect the normal operation of other electronic equipment.
2. Only shield the mobile phone signal in the test room, no interference to the mobile phone outside the test room, and will not interfere with the base station.
3. Only the downlink frequency of the transmitting base station is shielded without affecting the uplink frequency.
4. Green and environmentally friendly, the electromagnetic field strength is far lower than the national standard, and has no impact on the human body.
5. The operation is simple, the antenna is installed correctly, and it can run automatically when the power is turned on.
6. Problems and solutions of mobile phone signal jammers.
1. Why is the shielding range different from the description in the manual when the shield is working?
Answer: The shielding range of the shielding device is related to the electromagnetic strong field at the shielding site and the distance from the communication station. Generally, it is the best beyond 200 meters. The manufacturer tested it under normal conditions, so the shielding range will be a little different.
2. Will there be radiation when the mobile phone signal is shielded, and is it harmful to the human body?
A: Regarding radiation, as long as electronic products are large or small, there will be radiation. Any piece of electrical equipment will emit radiation. Just like the mobile phones we usually use, it is inevitable that there will be radiation when we lean 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 still much lower than the national standard, and it is not every day. It should be placed next to the ear, so it is almost harmless to the human body.
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