Cell phone jammer can be used for building jamming

cell phone jammer     influences a lot in protecting the security.
U913 in J8 pin power supply side, U913 13MHz reference frequency oscillator generates a reference frequency signal source all the way to synthesize a variety of carrier frequency, the other side all the way from the J6 output of U913 to the central processor, the logic of the clock as a mobile phone. Figure 4-27 is the Samsung A188 mobile phone 19.5MHz oscillator circuit. U101 and Y101 by the quartz crystal and other components, the resonant frequency of quartz crystal Y101 (reference frequency) is 19.5MHz, the U101 module for 1.5 times the frequency processing to get the reference signal and the frequency synthesizer logic of 13MHz clock signal. Frequency synthesizer reference signal output from the foot of C10 U101; logic clock signal output from U101 feet of H7. U101 pin power supply side of the D10. VCO components or whether the composition of the crystal oscillator circuit, the control signal needs to AFC, AFC signal from the logic circuit in the DSP (Digital Voice Processor) output. As the GSM mobile phone with time division multiple access (TDMA) technology to different time periods (time slot) taken between user, system, time synchronization with mobile phones is very important. More colors of    cell phone jammer are available.
Such as mobile phones clock with the system clock is not synchronized, it will cause the phone can not communicate with the system to normal. In the GSM system, public broadcast control channel (BCCH) information including frequency correction and synchronization information. Phone a boot, would the logic circuit under the control of scanning the channels from which to obtain synchronization and frequency correction information. If the system detects a mobile phone with the system clock is not synchronized, the phone will output logic AFC signal. AFC signal to change the 13MHz VCO circuit at both ends of the anti-bias, so that the VCO output frequency of the circuit changes. To ensure mobile phones and system synchronization. Common cell phone reference clock circuit used in contrast to the table below. You can buy various    cell phone jammer     in different locations.
Please check the following order: Check to see if a wireless network card; wireless network card driver is installed correctly; wireless LAN switch is turned on; if local authentication in the Guangdong mobile WLAN coverage area; double-click the shortcut icon on the wireless network card, view the search for wireless networks, whether can search for CMCC network. Please check the following order: whether the search to the CMCC network; whether you choose to connect CMCC network; CMCC network signal strength is normal; wireless network card properties are set to automatically obtain an IP address and DNS server address; If the windowsXPsp1 or earlier version of the system, update the system or install a wireless card client software. Please check the following order: Make sure not to use a proxy server; set to obtain IP address and DNS server address set to automatically obtain. cell phone jammer can be used for building jamming.
Is able to get to the correct IP address and DNS server address; such as using windows Vista operating system, please make the following operations: This problem is caused by Windows Vista and Microsoft Windows XP Service Pack 2 (SP2) caused by differences between the designs. Specifically, in Windows XP SP2, DHCP discovery packets, the BROADCAST flag is set to 0 (disabled). In Windows Vista, does not disable the DHCP discovery packets, the BROADCAST flag. Therefore, some non-Microsoft DHCP server the router will not process the DHCP discovery packets. Specific website as follows: http://support.microsoft.com/kb/928233/zh-cn. The document has a detailed description of the solution.