cell phone jammer contain different appearances and sizes

cell phone jammer contain different appearances and sizes.
The front panel of the optical transmitter switch controlled by the microprocessor. Temperature changes and aging of the device will cause the laser threshold current and the change of the

photoelectric conversion efficiency, If you want to precisely control the laser optical output power, two aspects should be tackled: First, to control the drift of the laser to automatically track

with four The threshold current of change, to ensure that the laser always work at optimum bias state; to control the amplitude of the laser modulation current, it automatically follow the

electrical, optical conversion efficiency changes. Automatic power control to complete the above two tasks, in order to ensure precise optical power of the laser output. Figure 4-2 automatic power

control circuit in Figure 4-2 to be automatic power control circuit. cell phone jammer include different functions and applicable locations.To ensure the normal work of the host of cell phone

jammer
Modulation circuit and control circuit 4-3 LED digital modulation circuit Figure 4-3 the LED digital modulation circuit modulation circuit and control circuit are as follows: the output pulse on-

off ratio (all "1" code the average optical power and full "0 "the ratio of the average optical power of the code, or the reciprocal of the extinction ratio) should be greater than 10, in order to

ensure enough signal to noise ratio of the optical receiver. The output pulse width should be much larger than the opening delay time (electrooptic delay), the optical pulse rise time, fall time

and the opening of the delay time should be short enough for high-speed modulation, the output light pulse can accurately reproduce the input pulse waveform. Should be imposed on the laser bias

current, in order to suppress the relaxation oscillations that may occur in the higher rate modulation. cell phone jammer are small in size and light in weight.
Guarantee to launch the five-machine work properly. Automatic power control (APC) and automatic temperature control (ATC), the output optical power sufficient stability of the 4.4 line coding

schematic principle of the 4-4 code table storage encoder principle Figure 4-4 meter storage encoder to mBnB code known as block codes: This is a very useful redundant binary code, which is the

source code of the input stream bit (mB) is a code word, and then become the same length of time slot n (n> m) bit (nB) for a longer codeword. Finally, the non-zero or zero format for transmission

of these new stream, m and n are positive integers, usually n = m +1. By such a transformation, code rate improves. Normally, this kind of cell phone jammer is the low power type.
Line code rate than the original binary code rate improves (usually increasing n / m) times. mBnB class, stream type, 1B2B, 2B3B, 4B5B, 5B6B pattern, but most of the 5B6B code. 5B6B code as an

example to look at its coding: 5B6B code, binary code 25 = 32 in five different codewords and six binary code 26 = 64 different code words to from 64 kinds to choose the appropriate code word to

represent the 5B code 32 code word.