People are always confused when purchasing a Cell Phone Jammer

People are always confused when purchasing a  Cell Phone Jammer .
Although the atmospheric absorption and dispersion makes use of laser communication have some boundaries on the ground, but now the use of gas lasers to create a good climate in the evening up to tens of kilometers of transmission of information equipment. United States to establish a 24 km two-way audio laser of 24 telephone lines, using 40 mW continuous wave He-Ne devices, potassium dihydrogen phosphate crystal pulse position modulation, the role of distance of 5 km. The former Soviet Union built two test line, a communication distance of 25km, a bandwidth of 100MHz, which can be 4-way access; the other way communication distance of 11km, 224 Road, at the same time calls. The late 1990s developed a strong function of laser communication systems, technical complexity, high degree of automation. Such as the U.S. developed laser communication system, equipped with global satellite positioning system (GPS), electronic compass, tilt calibrator, can be automatically scanned to receive high-speed positioning, the positioning of the signal beam to pass with communication equipment, to communicate quickly. You can also communicate with the radio communications, laser interchangeable, that is, in the rain, foggy weather radio available, other times with a laser communications. US-developed laser communication systems are also used cesium atomic line filters, spectral bandwidth can be limited to 0.01nm (traditional filter 3.5nm), field of vision increased to 60 ° (the traditional narrow), the power of only 5 W, transmission performance is greatly improved.
Summary of the system to TI's MSP430 ultra-low-power processor core design and make a point of light to detect and indicate the location of the source tracking system that can accurately track the location of point light sources, and indicate its location with a laser pointer. Track the trajectory of the system to assess the accuracy of trajectory tracking in order to complete the task to judge the accuracy of the design complete index.Another forming factor of  Cell Phone Jammer ’s performance price ratio is structure. Hardware system to MSP430F5438 core, according to the optical properties of the photodiode light detection position, a stepping motor to follow the instructions to complete the function. Software part is the idea than the benchmark light to write the source code to lock the light position, light detection and to achieve accurate positioning. After several measurements verify the results show that the design of the point source tracking system can automatically detect a point source locations and directions.
With the traditional means of communication and radio communication Optical, laser atmospheric communication with easy to install, easy to use features, it is suitable for the particular topography and wireline communications difficult to achieve and require a higher mobility in the workplace.