The rework rate of cell phone jammershould be lower than 0.05%

The abbreviation various cell phone circuit, grasp the understanding of these abbreviations we analyze the circuit to help. Below, some English symbols, used more often than in the cell phone reference for analysis of circuits and maintenance. AFC: Automatic Frequency Control, control the clock circuit of the reference frequency. GSM cell phone circuit, you see the the AFC words, it can be concluded immediately controlled by the signal line is 13MHz circuit. The signal is not normal, it may cause the cell phone can not enter the service, a serious cause the cell phone not boot. Some cell phones AFC marked VCXOCONT. AGC: AGC. The expert group is discussing the nonconforming items of cell phone jammer.
The signal is usually low-noise amplifier in the receiver circuit, is used to control the receiver front-end amplifiers in the signal intensity to the post-stage circuit to provide a more stable signal. ALERT: warning. Belong to receive the audio circuit, was used to prompt the user to the cell phone to enter or operational errors. ANT: Antenna. Used high-frequency electromagnetic waves into the high-frequency current or high frequency signal current into high frequency electromagnetic waves. In the circuit diagram, find the ANT, you can easily find the antenna and the antenna circuit. ANTSW: open line switching control signal. AOC: The automatic power control. Usually occurs in the transmitter power amplifier portion of the cell phone (Motorola cell phone is relatively common). The rework rate ofcell phone jammershould be lower than 0.05%.

BIAS: Bias. Often appear in the Nokia cell phone circuit, is used to control the power amplifier or other circuit. BSI: battery size. In many Nokia cell phones, the signal is not normal, the cell phone does not boot. BUFFER: buffer amplifier. Often appear in the output of the VCO circuit. CDMA: Code Division Multiple Access. Multiple access to the people a CDMA communication system capacity is greater than the GSM, the micro-cellular smaller and smaller power consumption required for CDMA cell phones, CDMA standby time longer. CLK: clock. CLK appears different from the role in different places. . Logic circuits, it is with the boot of the cell phone has a great relationship; in the circuit of the SIM card may result in the failure of the SIM card. The repair rate of mobile phone jammer has been reduced to the satisfactory level.
CPU: Central processing unit. Logic circuits in the cell phone to complete a variety of control of the cell phone. DCS: Digital communication systems. Working band in the 1800MHz band. The frequency of use of the system is higher than the GSM, a digital communication system, which is a derivative of GSM. The DCS and GSM. The DM-CS: Chip Select signal. Motorola cell phones, the signal used to control the transmitter circuit MODEM launch transform module and launch. DSP: Digital voice processor. In logic audio circuit, it will carry out the PCM encoded digital voice signal for further processing. The DUPLEX: diplexer. It includes receiving and transmitting radio frequency filter, in between the antenna and the RF circuit. The EAR: handset. Also known as a receiver, speakers, and speaker. It is connected to receive the audio circuit. The director thinks that the repair rate ofcell phone jammercan be improved more.