Cell phone jammer equips with the car charger and directional antenna

Currently, only the early production of some Nokia phones using this approach. According to different working frequency band width, high-frequency power amplifier can be divided into narrow-and broadband-two categories. The so-called band width, does not refer to absolute frequency, but the relative frequency, that is, its passband center frequency ratio. Phones are high-frequency power amplifier circuit in the broadband amplifier. PA power amplifier is usually said. Used to amplify the high frequency signal and get a large enough output power. Broadband high-frequency power amplifier using a wide frequency band transmission line transformer as the load, the use of resonant network, so you can transform a wide range of operating frequencies without tuning. No wiring is need between cell phone jammer or between cell phone blocker and the main computer.
Transmission line transformer is wound on high permeability magnetic ring on the transmission line formed. In some cell cell phonecircuits, widely used in microstrip circuits. Modulated RF signal by the power amplifier, you can transfer. We see this as the transmit power amplifier power amplifier. For the RF power amplifier is required in a given frequency or frequency range of RF power output must be. RF power amplifier is always work in the large-signal state. In the phone, often using silicon and gallium arsenide field effect transistor FET to power amplifier tubes, their thermal conductivity is much higher than germanium. All cell phone jammer should be then turned on and operated as a whole.
And a growing number of mobile cell phoneuse power amplifier components. A complete power amplifier circuit typically includes driver amplifier, power amplifier, power detector and control, power supply circuit. The main requirement is that the power amplifier output power, bandwidth and efficiency, followed by the input and output voltage standing wave ratio. Figure 4-19 Motorola P7689 mobile cell phonepower amplifier circuit. Mainly by the power amplifier module amplifier U300 and other components, from the transmitter signal from the preamplifier input pin 7 of U300, the U300 amplified in two, the first 14 feet from the U300 sent to the antenna switch, which , TX-DCS 1800MHz band is allowed to transmit signals, TX-GSM 900MHz band is allowed to transmit signals. Requestors are as many as cell phone jammer, serially connected at the power supply end of cell phone jammer.
U300 The first 8 feet of internal function blocks control signal input pin. Mobile transmit power is controlled, it is in a different location, according to the system control commands work in a different transmit power levels. Figure 4-20 is a general block diagram of power control in mobile phones. The control loop works as follows: power amplifier amplified transmission signal to the antenna into a high-frequency electromagnetic waves sent out. Output of the amplifier, a sampling circuit to take part by transmitting signals reflected by the high-frequency transmission power rectifier to get the size of a DC level. This level in comparison with the circuit from the power control logic circuit compares the reference level and outputs a control signal to control the amplifier bias or power supply circuit, so as to control the power of purpose. cell phone jammer equips with the car charger and directional antenna.
Motorola P7689 mobile cell phonethe power control circuit shown in Figure 4-21. Power control circuit mainly constituted by the U390. U390 is the first 12 feet RF power detection input pin, pin 7 is the power control output feet, 8 feet from the base side of the base level power control, power detection signal and the reference level to compare the control to automatically adjust the U390 EXC 7 feet the size of the power control level, in order to achieve power control. Section III mobile frequency synthesizer circuit analysis in modern mobile communications, often require the system to provide adequate channel, the mobile station can be controlled according to the system change their operating frequency. This need to provide multiple channels of frequency signals, the use of multiple oscillators is unrealistic. The black flashing means the position of cell phone jammerstill exists but it is not under control right now.