cell phone jammer has the function of shock resistance

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 above is a description of how to make the VCO output frequency stability. But how to make the VCO frequency change it? In explaining this question, first to explain why the frequency of the VCO to change this problem. Because mobile phones are mobile, moving to another place, for the cell phone service cell (CELL) becomes another of the frequency, so they must change their mobile phones to receive and transmit frequency.  cell phone jammer has the function of shock resistance
Some documents about repair of  cell phone jammer  can be provided.U302's output is divided into two: 39 feet all the way to the U101 as the output signal; another way to 13 feet for the phase-locked loop U301 sampling signal. The signal is divided in U301 and compared with the reference clock signal, the voltage control signal to be 9 feet from the U301 output signal through the resistor R302, R303 and R304 and capacitor C311 and other form of low-pass filter circuit to the U302's 5 feet, by changing the U302 in both ends of the varactor reverse bias, the output frequency to control U302. When the logic circuit by SYNEN, SYNDATA, SYNCLK U301 in three lines to change the divider ratios, U301 9-pin voltage changed, U302's output frequency is also changed, to channel conversion purposes.  cell phone jammer  will be used in the area where using cell phone is not allowed.
For the second inverter circuit superheterodyne receiver circuit: two oscillator VCO frequency synthesizer main role is to produce two vibration signals sent to the receiver two mixer circuit, mixer circuit and receiving two input IF signal in a mixed frequency, resulting in two intermediate frequency signals. An inverter circuit for superheterodyne receiver circuit: two oscillator VCO frequency synthesizer main role is to produce two vibration signal to the receiver demodulation circuit to demodulate the RXI / Q signals. The following Panasonic GD90 mobile phone the second local oscillator circuit as an example, the circuit shown in Figure 4-30. Two oscillator VCO circuit (1FVCO) provided by the VCO module components U303, U303 pin 1 is signal output control terminal is 5 feet, feet is the power side. U303 will have a 540MHz circuit of two oscillator signals. U303 output signal is divided into two: 36 feet all the way to the U101 as the output signal; another way to U301 pin 4 for the sampled signal. U101 8-pin output frequency of the VCO control signal.cell phone jammer has the feature of moisture resistance