cell phone jammer requires high for assembly process and commission process
Receiver signal is received by the antenna down (only to receive very small part of the power), and through the feeder to the receiver. Mobile phone antenna, small size, light weight, with two orthogonal polarization characteristics, all the main surface of the radiation pattern is quasi omni-directional bandwidth as wide, the body (hand) on the antenna as small as possible body on the antenna of the electromagnetic energy Specific Absorption Rate (SAR) should be as small as possible. Phone antenna main technical indicators: frequency, gain, impedance, standing wave ratio, the absorption rate. R008/R001 mobile phone antenna structure and form: built-in. And then turn them on after switching off the power supply when the green light of the detector of cell phone jammer intelligent system flashes.
The antenna switch is used for automated testing of the mechanical switch in the RF channel, connected with the antenna parallel to reduce the 0.5d loss during the actual use. Production test and test cable connected. The frequency synthesizer circuit of TI's platforms have been integrated in the transceiver chip, chip external only needs a reference frequency source circuit, namely: the crystal oscillator (CRYSTAL) 26MHz. ABB automatic frequency control signal (AFC), real-time frequency control, CRYSTAL generate the 26MHz frequency source, the TRF6151 internal buffer amplification processing to provide reference to the DBB, the DBB divided by two to produce 13 MHz frequency source supply ABB and other circuits use . The following figure shows the crystal oscillator schematic. The connection method of NC box of cell phone jammer intelligent system is shown in the figure.
Emission unit consists of the following circuit: TRF6151 transceiver and RF3166 power amplifier and control circuit composition. The baseband I / Q signal after quadrature 90 ° phase shift in the TRF6151 analog I / Q signal transform GMSK modulation, after the OFFSET the PLL frequency conversion to the corresponding frequency. Good GSM RF signal through the matching circuit output modulation by LBTXOUT (HBTXOUT). Amplification through the PA, launched by the front-end module with antenna. The firing unit block diagram is as follows: by the following circuit: TRF6151 transceiver and RF front-end module, the matching circuit. As follows for the receiving block diagram. Other units of phone jammer intelligent system can be built according to this.
Signal flow: GSM or DCS signals of base station antenna to receive from the air, through the switch of the front-end module, after the SAW filter in the front-end module, transform into a differential signal input to the TRF6151 transceiver; TRF6151 transceiver front-end low noise amplification, orthogonal transformation, amplification, filtering; the final output I / Q signal to the baseband circuit. The following picture shows the block diagram of the TRF6151 transceiver to receive part of the. GSM signal processing controller DBB GSM signal processing, voice codec and internal 32-bit microprocessor, mobile phone software for full control. Connection description of Program B of cellphone jammer intelligent system is stated in the next chapter.
The control section includes wireless RF control of the mobile phone, and send and receive signals between the base station processing and connected to the control of the mobile phone, the sound signal encoding, decoding baseband control. Q signal phase variation detection signal according to the received signal from the GSM signal processing controller frequency deviation, the AFC feedback to crystal the PIN1 control voltage to control sensitivity: 8 to 13.5ppm / V (0.4 to 2.4 V's control); thus constitute an automatic frequency control (AFC) feature, the base station frequency to maintain the frequency error of the mobile phone within the scope of technical standards. Transmit power output control. Transmitter, the IF amplifier with high-frequency power amplifier section uses a variable gain amplifier, to ensure that the necessary dynamic range. Insert the power supply of the second detector of cell phone jammers intelligent system into the city electricity socket.
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