When schools are conducting large-scale exams, they must use mobile phone signal jammers in the examination room, so as to prevent students from using mobile phones to cheat. Therefore, schools must install some test room mobile phone signal jammers near the classroom before the exam, but the school is buying Which type of shielding device should I buy?
Jammer-MartNovember 2020
1. Is there a base station near the school? In the process of construction, we often find that customers tell us that the signal jammer is not effective. 2G3G can be shielded, which means that the call signal can be shielded, but the 4G signal cannot be shielded. In fact, the power of each jammer is different. Generally, the power of 4G1 and 4G2 is about 2W, which means 33db. If there is a base station within 200 meters nearby, such a machine also shields not 4G signals. It will also appear that customer feedback has no effect.
2. How to distinguish frequency. The operating frequencies of the shield are: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The operating frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control the range of about 20 meters in diameter, using DC-DC converter input voltage and 5V output voltage.
3. The phone signal (234G) of the call can be selectively shielded. If you only shield 23G or only 34G, this can be adjusted before leaving the factory. In addition, there are 2.4GWIFI, 5.8GWIFI, VHF, UHF and other frequency bands. How to understand it? In other words, if you only want to block calls or WIFI, the manufacturer can focus on 2G3G on the host, and the cost will also come down.
4. Distinguish the power size. This is the easiest to fake, and it is also a place where manufacturers often play with cats. Because, to measure the actual power level, a professional spectrum analyzer must be used. It is impossible for ordinary customers to have such equipment. Therefore, this depends entirely on the professionalism of the customer's choice of equipment. Power size: The shielding device can generally be divided into low power, medium power, high power, and the power is between 3W-100W.
The shielding distance of the jammer is not fixed. It is determined according to the local signal environment. The stronger the mobile phone signal, the shorter the shielding distance, and the weaker the signal, the longer the shielding distance. Be sure to measure the signal strength at the place of use before buying.
1. Is there a base station near the school? In the process of construction, we often find that customers tell us that the signal jammer is not effective. 2G3G can be shielded, which means that the call signal can be shielded, but the 4G signal cannot be shielded. In fact, the power of each jammer is different. Generally, the power of 4G1 and 4G2 is about 2W, which means 33db. If there is a base station within 200 meters nearby, such a machine also shields not 4G signals. It will also appear that customer feedback has no effect.
2. How to distinguish frequency. The operating frequencies of the shield are: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The operating frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control the range of about 20 meters in diameter, using DC-DC converter input voltage and 5V output voltage.
3. The phone signal (234G) of the call can be selectively shielded. If you only shield 23G or only 34G, this can be adjusted before leaving the factory. In addition, there are 2.4GWIFI, 5.8GWIFI, VHF, UHF and other frequency bands. How to understand it? In other words, if you only want to block calls or WIFI, the manufacturer can focus on 2G3G on the host, and the cost will also come down.
4. Distinguish the power size. This is the easiest to fake, and it is also a place where manufacturers often play with cats. Because, to measure the actual power level, a professional spectrum analyzer must be used. It is impossible for ordinary customers to have such equipment. Therefore, this depends entirely on the professionalism of the customer's choice of equipment. Power size: The shielding device can generally be divided into low power, medium power, high power, and the power is between 3W-100W.
The shielding distance of the jammer is not fixed. It is determined according to the local signal environment. The stronger the mobile phone signal, the shorter the shielding distance, and the weaker the signal, the longer the shielding distance. Be sure to measure the signal strength at the place of use before buying.