Cell phone jammer can be used for a longer time

13MHz crystal and 13MHzVCO are two different components, that is, 13MHz crystal oscillator is a component must match the external circuit to produce 13MHz signal. 13MHzVCO an oscillating component that can generate the 13 MHz signal. Phone RF circuits, in addition to 13MHzVCO an oscillator VCO (UHFVCO, RXVCO, RFVCO), two oscillator VCO (1FVCO, VHFVCO), launch the VCO (TXVCO) and other. VCO circuit is usually a component of each, make up the VCO circuit components include resistors, capacitors, transistors, varactor. VCO components of the circuit components encapsulated in a shield. Of course, the commission condition of cell phone jammer is also very important.
Not only simplifies the circuit, but also reduces the interference of external factors on the VCO circuit. VCO components generally have a 4-pin - output, power supply terminal, the control side and ground side. Figure 2-13. VCO components there is a pattern, the ground resistance to ground for the "O"; very close to the voltage of the power supply terminal and the RF voltage of the machine; control termination resistance or inductance in the standby mode or press the "112" start emission the pulse control signal port; the rest is output. Mobile phone antenna is both a receiver antenna and transmitter antenna. The phone work in the 900MHz or 1800MHz bands, so the antenna size can be very small. The antenna is divided into the receiving antenna and the transmitting antenna. The commission status of cell phone jammer  has been submitted.
The high-frequency electromagnetic wave into the conductor of the high frequency signal current is the receiving antenna. High frequency signal current into the conductor out of high frequency electromagnetic radiation is the transmitting antenna. In the schematic on the antenna is usually the letter "ANT". With the development of miniaturization in mobile phones, some cell phone antenna through clever design, with the traditional concept of antenna not. Antenna dual-band handsets like Nokia 3310, for example, looks like it is just some of the metal coating on the chassis. In the mobile phone repair process, if the antenna is damaged, should try to use the original antenna can not be free to use other phone antenna substitution that does not mean that other antenna gain is low, caused by poor cell phone signal. Before cell phone jammer comes out of the factory.
Main reason is that the antenna is a mobile high-frequency circuits matched load, if the substitution inappropriate, will result in the circuit do not match, increasing the power loss of the circuit to burn high-frequency components such as amplifiers, filters, etc., and will result in a fast, mobile phone power consumption fever fault. The circuit ground is a specific concept, which differs from other devices, in fact, can not find the "ground" such a device, it's just a voltage reference point. Frequently used ground circuit in the schematic symbol has two types, as shown in Figure 2-14. By GB, 2-14a as shown in the circuit symbol is generally connected to the ground and the earth; shown in Figure b, the above-mentioned circuit symbol of the ground as a reference point.  phone jammer  should be commissioned to the best working condition.