cell phone jammer can eliminate noise pollution caused

cell phone jammer can eliminate noise pollution caused by the cell phone.
The following Panasonic GD90 mobile phone of a local oscillator VCO frequency synthesizer circuit as an example, the circuit shown in Figure 4-29. Panasonic GD90 cell phone reception and launch of the first mixer to be used to RXVCO conversion circuit signal, and RXVCO circuit module provided by the U302. U302 module can work in GSM mode or DCS mode, the band switching control signals DCS-GSM work through the Q301 circuit to U302 in the corresponding mode. U302 pin 1 is signal output; 3 feet is the band switching control terminal; 5 feet is the control side; 7 feet is the power supply side. When the U302 work on the GSM frequency band, from 1 foot produce 1160 ~ 1185MHz, a local oscillator signal. When the U302 working in DCS band, the heavier the foot produces 1580 - 1665MHz, a local oscillator signal. The antenna of cell phone jammer comes out of the open on the top of the box body. 
For the second inverter circuit superheterodyne receiver circuit: two oscillator VCO frequency synthesizer main role is to produce two vibration signals sent to the receiver two mixer circuit, mixer circuit and receiving two input IF signal in a mixed frequency, resulting in two intermediate frequency signals. An inverter circuit for superheterodyne receiver circuit: two oscillator VCO frequency synthesizer main role is to produce two vibration signal to the receiver demodulation circuit to demodulate the RXI / Q signals. The following Panasonic GD90 mobile phone the second local oscillator circuit as an example, the circuit shown in Figure 4-30. Two oscillator VCO circuit (1FVCO) provided by the VCO module components U303, U303 pin 1 is signal output control terminal is 5 feet, feet is the power side. U303 will have a 540MHz circuit of two oscillator signals. U303 output signal is divided into two: 36 feet all the way to the U101 as the output signal; another way to U301 pin 4 for the sampled signal. U101 8-pin output frequency of the VCO control signal. Different cell phone jammer has different technical parameter. 
It is very important to test shielding radius of cell phone jammer .Phase detector referred to as PD, PH, or PHD (PhaseDetector). A phase comparator, which changes the phase of VCO oscillating signal is transformed into voltage changes, the phase detector output is a pulsating DC signal, the pulse DC signal low-pass filter (LPF) to filter out high frequency components after control the VCO circuit. Phase detector is a phase comparator, its input reference signal generated by the VCO phase comparison signal input, two output reflects the phase error signal error voltage. Phase detector is varied, with numbers, but also simulated. Such as dual-port phase detector, PFD, etc. cell phone jammer can work as long as the antenna is collectively connected.