To expand the cell phone call frequency

GSM digital cell phone voice is digitized before being sent over the wireless channel, it is not as easy as analog cell phone interference, so a clear voice call, a small disturbance. However, because the digital transmission of voice, there are also voice some of the shortcomings of distortion. Machine analog cell phone voice distortion better than the GSM digital machine. Now, the relevant departments are studying the development of more advanced digital voice encoding techniques to reduce the GSM cell phone voice distortion. CDMA digital networks: CDMA is the acronym for Code Division Multiple Access (Code Division Multiple Access). The fourth characteristic is the high cost performance of cell phone jammer.
It is a branch of the digital technology - spread spectrum communication technology to develop a new and sophisticated wireless communications technology. It can meet the demand for mobile communication capacity and quality of high demand, with high spectrum efficiency, voice quality, confidentiality, call drop rate is low, electromagnetic radiation is small, large capacity, wide coverage, etc., can significantly reduce investment and reduce operating costs. Industry operators are trying to increase their number of users of the system, reducing the cost per user, and create greater profits and actively strengthen market penetration. CDMA technology is to solve the problem of digital communication technologies. The so-called "GSM / CDMA dual-mode cell phone" refers to cell phone can support both GSM and CDMA network communication technology. cell phone jammer can ensure the safety and confidentiality in the workshop.
It is based on the actual operating environment or from the need to make a choice, which play a role in better network technology, which switches to cell phone mode let go, and if in one mode, the mobile communication quality is not high or there other adverse phenomena of communication, free to work on another network mode, it actually is to expand the cell phone call frequency, and greatly improve the stability of communication only. TDMA (Time Division Multiple Access): is the abbreviation for Time Division Multiple Access, which is a use of Time-Division Multiplexing (Time Division Multiple Access) to provide wireless digital services technology, which represents a digital cell phone system transmission technology. The working power supply of cell phone jammer is AC 220V/3W.
TDMA to a radio frequency into multiple time slots, then these time slots allocated to multiple calls. Thus, a radio can support multiple data channels, now that technology has become today's D-AMPS and GSM system is based. (A digital transmission technology, the radio frequency is divided into different time slot to be allocated to a number of calls.) FDMA (Frequency Division Multiple Access): FDMA is a data communications technology that is allocated to different users in the same slot The frequency of the different channels. According to this technique, the frequency division multiplexing in the system of centralized control of the frequency bands allocated to the user upon request. Compared with the fixed distribution systems, frequency division multiple access channel capacity required to dynamically exchange. cell phone jammeradopts the white-aluminum shell of high heat dissipation performance.
In FDMA systems, a channel assigned to the user, that is the spectrum, a spectrum that is used as the forward channel of the base station to mobile station direction of the channel, and one for the reverse channel that is the direction of the mobile station to base station channel. This communication system base station must transmit and receive multiple signals at different frequencies, any communication between two mobile users have to transit through the base station, which must occupy two channels (2 spectrum) in order to achieve duplex communication. All previous analog communication systems using FDMA. Frequency division multiple access (FDMA) is the use of frequency modulation of the multiple access technology. The shielding frequency of cell phone jammer can be customized according to requirements of customers.