Normal function can recover once leaving the shielding area of cell phone jammer

China's cell phone frequency bands are commonly used in CDMA cell phones occupied CDMA1X, 800MHZ band; GSM cell phone frequency band occupied by 900/1800/1900MHZ. The use of spread spectrum CDMA 1X rate of SR1, meaning that the forward channel and reverse channel are used chip rate 1.2288Mbit / s direct line of single-carrier spread spectrum mode. Therefore, it can be easily and IS-95 (A / B) backward compatibility to achieve a smooth transition. Because CDMA 1X coherent demodulation with a reverse, fast forward power control, transmit diversity, Turbo coding and other new technology, its capacity is much higher than the IS-95. Under the same conditions, the Mandarin sound business case, the capacity is roughly twice the IS-95 system. The worker should record the manufacture process of antenna of cell phone jammer in the log.
CDMA 1X network can carry voice services as a platform, or as a packet data wireless access to Internet hosting platform, that can provide traditional voice services, it can provide users with end to end packet transfer mode data services. Unicom's CDMA network when first built, coincided with the transfer to the Great Wall Telecom China Unicom, China Unicom to make easy access to the 800MHz frequency band two-way 10M resources, which makes China Unicom has a valuable frequency resources. Therefore, China Unicom will use its resources in the 800MHZ band built on the CDMA network. Unicom's CDMA network is the construction and operation of the exclusive rights to operate can bring the market space is very obvious. The antenna of cell phone jammer contains the omnidirectional antenna and directional antenna.
With the support of CDMA network, China Unicom can achieve a number of new value-added data services, which may win more CDMA users. Occupied band GSM cell phone in China is mainly 900MHZ and 1800MHZ. Essentially 1800MHZ also because the surge in the number of cell phone users, resulting in a mobile communication network system is in overload state, which eventually led to the cell phone communication is prone to like dropped calls, crosstalk, poor voice quality, difficult to access, such as failure the phenomenon. To address these symptoms, more and more cell phone operators and manufacturers are beginning to realize the urgency to solve this problem, and continue to take relevant measures to further expansion of mobile networks, so GSM1800Mhz have come into being, and has been called as DCS1800 (Digital Cellular System), it appears that based on GSM900, 1800's dual-band network a reality. The mounting hardware of cell phone jammer is a must for mobile phone jammer .
Use GSM900/GSM1800 dual-band cell phone, users can switch between GSM900 and GSM1800 can be effectively avoided in the past dropped calls, poor call quality issues and difficult than previously to use only GSM900 network calls more convenient. In order to further expand the mobile network system capacity and improve the quality of mobile voice communications, recently launched in the market, a "tri-band cell phone." So-called "tri-band" is consists of three operating frequency, three frequency is GSM900Mhz, DCS1800Mhz and PCS1900Mhz, and so on, so-called "tri-band cell phone" refers to the cell phone can receive GSM900M, DCS1800Mhz and PCS1900Mhz three frequency band signals, from which to choose. There are several ways to measure the emission power of cell phone jammer .
The signal strength of that band, on the choice of which base station the signal, if one then blocked, free to do a band signal. It actually is to expand the cell phone termination rates. Cell phone users are concentrated in some areas, especially the right to use tri-band cell phone tri-band cell phone because the flexibility in the GSM900, DCS1800 and PCS1900 switch between, so always call constantly and call quality. PCS1900 trillion network in North America (U.S., Canada) and the field of European countries, the widespread use of the communications network segment. As the tri-band cell phone will work simultaneously at three different frequencies among the segments, so the tri-band cell phone is undoubtedly the three network characteristics. From a technical point of view, GSM1800 because of the high frequency band, making the signal penetration ability. The remote controller of cell phone jammer can make cell phone jammer easier and more convenient to be used.