The failed or damaged cell phone jammer can be promptly found

 There is no need to get the special training to operate cell phone jammer .
VCO circuit for transmitting the mobile phone with a local oscillator VCO frequency synthesizer to generate a local oscillator signal, on the one hand to receive a mixer circuit, mixer and receive signals from the mixer output an IF signal. On the other hand, generates a local oscillator signal and transmit VCO (TXVCO) mixing the output signal, the output firing frequency reference signal, transmitting frequency reference signal and transmit the IF signal at the transmitter have been adjusted change in the phase detector module compares the output contains pulsating DC signal to send data, go to control transmitter VCO circuit. For the circuit with a cell phone transmitter on the frequency (less, such as the Nokia 6110 mobile phone), a local oscillator VCO frequency synthesizer to generate a local oscillator signal, on the one hand to receive a mixer circuit, mixer and receive signals from the mixed frequency output an IF signal. On the other hand, generates a local oscillator signal directly and transmit the modulated IF signal mixer (because there is no transmitter VCO circuit), the final of the transmitted signal.
When using digital phase detector, because of its dual-port output output: In connection with the loop filter on a problem. Usually added in between a double-ended input single-ended output, and can phase detector output phase error signals correctly reflected in the circuit, this circuit is known as the charge pump or the pump circuit. Motorola's GSM mobile phone, its transmitter frequency synthesizer basically uses the pump circuit. In the frequency synthesizer, in order to make accurate phase comparison, the phase detector is working in a low state. In the mobile phone circuit, the phase detector is usually integrated with the divider is a dedicated chip, the chip is often referred to as PLL (phase locked loop), or integrated in a complex chip (the chip that contains a variety of function of the circuit). The failed or damaged cell phone jammer can be promptly found.
Low-pass filter referred to as LPF (LowPassFilter). Low-pass filter in the frequency synthesis loop, also known as the loop filter. It is an RC circuit. In the phase detector and VCO circuit between the basic form of low-pass filter circuit shown in Figure 4-28. Low-pass filter capacitor through the resistor to set the appropriate parameters, so that high frequency components are filtered out. As the phase detector PD output contains not only the DC control signal, and some high-frequency harmonics. These harmonics will affect the VCO circuit. Low-pass filter is necessary to filter out these high frequency components in order to prevent disruption of the VCO circuit.