The incomg test of Cell Phone Jammers matters a lot

The incoming test of Cell Phone Jammers has to be done.
For example, frequently used in Tests layer of code to create a short message, we can AreaLibrary project to create a method, such as the Public abstraction int TmailWriteSMS (string ToPersonal, string SubjectInfo). With this method, after, Tests layer in each test case, you can use this method, and no longer needed in each test case, create a duplicate write this short message code. Tests for each test case as long as the process control and inspection point on it, so that the code becomes compact and streamlined. Tests project, test suites and test cases is set. For example, I need to test the software sends cell phone short message TMail function, receive short message function. Send a short message function which has 10 test cases, receive short messages of 15 test cases. Tests will be sent in the SMS program can function as a test suite (SendMessengTestSuit), will receive a short message as another test suite (RecieveMessengeTestSuit). The incomg test of Cell Phone Jammers  matters a lot.In modern cell phone communications, and often require the system to provide adequate channel, the cell phone station can also take control of the system change their operating frequency. This need to provide multiple channels of frequency signals, the use of multiple oscillators is unrealistic. In the actual circuit, usually using frequency synthesizer to provide sufficient accuracy and good stability frequency.  As the GSM cell phone with time division multiple access (TDMA) technology to different time periods (time slot) taken between user, system, time synchronization with cell phones is very important. Such as cell phones clock with the system clock is not synchronized, it will cause the phone can not communicate with the system to normal.
If some external factors such as voltage, temperature can cause the VCO frequency is increased, the frequency output signal is f2 N n higher than the reference signal, the phase detector to detect the changes, the output voltage decreases, the varactor both ends of the reverse bias decreases. This makes the varactor diode junction capacitance increases, changes in the oscillation circuit, VCO output frequency is reduced. If external factors cause the VCO frequency decreases, the control loop perform the opposite process. The following Panasonic GD90 cell phone of a local oscillator VCO frequency synthesizer circuit as an example, the circuit shown in Figure 4-29. The joint venture of Cell Phone Jammers has high production ability.Panasonic GD90 cell phone reception and launch of the first mixer to be used to RXVCO conversion circuit signal, and RXVCO circuit module provided by the U302. U302 module can work in GSM mode or DCS mode, the band switching control signals DCS-GSM work through the Q301 circuit to U302 in the corresponding mode. U302 pin 1 is signal output; 3 feet is the band switching control terminal; 5 feet is the control side; 7 feet is the power supply side. When the U302 work on the GSM frequency band, from 1 foot produce 1160 ~ 1185MHz, a local oscillator signal. When the U302 working in DCS band, the heavier the foot produces 1580 - 1665MHz, a local oscillator signal.