cell phone jammer enhances safety of oil field and oil depot

cell phone jammer enhances safety of oil field and oil depot.
There are three basic cell phone receiver framework: one is single-conversion superheterodyne receiver, a dual conversion superheterodyne receiver is, the third is a linear direct conversion receiver. Conversion superheterodyne receiver is the mixer core circuit, receiver circuit according to phone number in the mixer to determine the receiver circuit. Only one receiver RF mixer circuit is called a conversion superheterodyne receiver. A conversion superheterodyne receiver block diagram shown in Figure 4-1. It includes the antenna circuit (ANT), low-noise amplifier (LNA), mixer (Mixer), intermediate frequency amplifier (IF Amplifier) and the demodulation circuit (Demodulator) and so on. Motorola mobile phones are used more than receiving circuit is basically the circuit. A conversion superheterodyne receiver works as follows: the antenna sensor to the wireless cellular signal (GSM900 frequency band 935, - 960MHz or DCSl800 band 1805 --- 1880MHz) continuously variable frequency, the antenna circuit and RF filter into the receiver circuit. The received signal is first amplified by a low-noise amplifier, the signal is then amplified by the RF filter, was sent to the mixer. Best use of cell phone jammer should be made.
In the mixer, the RF signal mixing with the receiving VCO signal, the receiving IF signal. IF signal is amplified by the IF, the IF processing module for RXI / Q demodulator, demodulation reference signal from the receiver with the IF VCO. The first intermediate frequency signal processing circuit was divided, and then mixing with the receiving IF signal, received 67.707kHz of RXI / Q signals. If there are two RF receiver mixer circuit, the machine is dual conversion superheterodyne receiver. Double-conversion superheterodyne receiver block diagram: Figure 4-2. Compared with the single-conversion receiver, a second multi-frequency receiver mixer and a VCO, the VCO circuit is called in some IFVCO or VHFVCO. Nokia phones, Ericsson phones, Samsung, Panasonic and Siemens cell phone reception circuit mostly this circuit. cell phone jammer blocker is not recommended for the large vehicle.
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The first IF signal and receiving the second local oscillation signal mixing, the receiving the second IF. Received from VHFVCO second local oscillation circuit. The second intermediate frequency signal received by the two intermediate frequency amplification, the IF processing module for RXI / Q demodulator, demodulation reference signal from the receiver with the IF VCO. The first intermediate frequency signal processing circuit was divided, and then mixing with the receiving IF signal, received 67.707kHz of RXI / Q signals. With the advent of new mobile phones, some of the new phone using the linear direct conversion receiver circuit.