Cell phone jammer is in the cigarette pack shape

The leather cover of    cell phone jammer     is free. In modern mobile communications, and often require the system to provide adequate channel, the mobile 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. One or more of the reference frequency signal is transformed into one or more of the desired signal frequency is the frequency synthesizer technology, otherwise known as frequency synthesis technology. Commonly used as a mobile phone with a PLL frequency synthesizer. Each frequency synthesis loop includes five basic functional circuits: reference clock oscillator, phase detector, low-pass filter, VCO and divider. Shown in Figure 4-22.     cell phone jammer     is in the cigarette pack shape.
Reference oscillation signal is set f1, set the VCO output signal is f2. Divider output signal is f2 / N. Purpose of the control loop is to make f1 = f2 / N. Phone reference clock oscillation circuit is a very important phone circuit, resulting in the 13MHz clock, while the logic circuit for the handsets provided the necessary conditions, on the other and provide the basis for the frequency synthesizer circuit clock. Phone 13MHz reference clock circuit, there are two circuits: one dedicated 13MHzVCO components, VCO components generally have four side El: output, power supply side, AFC control terminal and ground. Figure 4-23 is the Siemens 2588 phone 13MHzVCO circuit. Figure 4-24 is the Nokia 3310 phone 26MHzVCO circuit.     cell phone jammer is of the small and light design.
The other is by a 13MHz (26MHz, 19.5MHz) quartz crystal, integrated circuit and external components, the crystal oscillator circuit. Figure 4-25 is the Ericsson T28 mobile phone 13MHz crystal oscillator circuit. By the N234 and 13MHz crystal B320, varactor diode V322, V321, etc., the circuit 13MHz signal, processed by the N234 module output two-way: the way through capacitor C300, C302 to D300 module 15 feet, to the frequency synthesizer circuit to provide reference signal; the other way 52 feet from the N234 output logic to the logic circuit provides the clock signal; 13MHz circuit module control signal VCXOCONT from the N800. Figure 4-26 is the Motorola V998 mobile phone 26MHz oscillator circuit. From the 26MHz quartz crystal Y230, varactors CR230 and IF module U913's internal oscillator circuit is composed. Circuit, Y230 crystal is 4 feet, of which three feet are linked to a ground terminal, while the other foot is as output, AFC automatic frequency control voltage output from the U913 side of J7.     cell phone jammer has a built-in cooling fan for heat dissipation.