The hole at the bottom of installation box of mobile phone jammer

 The installation box of mobile phone jammer is with shutter-type ventilation positions at two sides.
After appropriate amplification, filtering after mixing with the launch of the oscillator, the frequency to the frequency point up and filtered into the amplifier circuit, amplifier circuits are generally multi-stage amplifier, which can be an ordinary three tube amplifier, you can also is a dedicated power amplifier chip. Multi-stage amplifier in general there are one or two levels adjustable gain amplifier, and the remaining fixed-gain amplifier. Amplifier gain control is generally based on the output power level, the output frequency to determine the output of the gain control voltage. As the cell phone power amplifier circuit of its amplitude-frequency characteristic is not ideal linear, so the cell phone after the regular production and maintenance of its power amplifier gain control circuit to be calibrated, but also through the power amplifier control circuit coupled back part of the output RF output signal for feedback control. The hole at the bottom of installation box of mobile phone jammer can prevent from water accumulation.This paper studied the use of deviation from the share of the deviation from the share of industrial output, Jiangxi, Jiangxi and industrial competitiveness within the industry, combined with industrial development in Jiangxi, Jiangxi development of key industries that future recommendations. Deviate from the share of the regional industrial competitiveness, including competitiveness of the regional industrial structure and industrial competitiveness within the region.As long as a good grasp of the economic pulse, to improve the core competitiveness, it is possible to make the development of China-made cell phones a substantial breakthrough. Social and cultural environment that China is a populous country, China has a population density makes a huge market potential, especially in recent years, cell phone is no longer a luxury consumer goods, but a very popular and popular communication tools, and even the rural market also shows huge space for development, the Chinese cell phone users in just 20 years, developed into a 5. 08 million cell phone users to become the world's largest countries, China's mobile communication industry's rapid development has been the world's attention. In addition, consumers pay attention to is the "affordable" "maverick" and cell phones and electronic products, the replacement rate is very fast, the future trend will be a Pocket PC cell phones, mobile TV and so on. The shielding signal in the area along the pointing direction of antenna of mobile phone jammer will be respectively weaker.