Forthgoer of the cell phone jammer industry

Forthgoer of the cell phone jammer industry
Water severe than on land circuit circuit 5, the ground circuit frequency band than the mountain circuit serious long-distance trunk lines in use long-distance, short distance, short distance, short distance, short distance short distance, urban short distance, short distance, urban areas short distance, short distance, urban short distance, the decline of measures against A. without diversity? reduce the level of the ground reflected wave? increased ground reflection angle? variety of balance measures the time domain and frequency domain equalization balance) (time domain equalization and frequency domain equalization) B. diversity techniques? The Chuangzhao mobile phone jammer company is located in Hefei, which is the city of science in China. FD frequency sub-polar. swf frequency sub-polar. swf? SD spatial pole. swf spatial pole. swf 10.2/F1/2 <H <37/F1/2 H measures against the decline of the waveguide type SD FD K-type antenna gain antenna height attenuation type (block, rain attenuation) attenuation type (block, rain attenuation) away from the station to reduce the frequency reduced 2 microwave communication system block diagram of microwave communication system block diagram of microwave communication system block diagram TX (modulated) source coding TX BB MOD on the splitter amplifier frequency antenna system R x letters: letters of facilities. swf letters: letters of facilities.The cell phone jammer company is specialized in researching, developing and marketing photoelectric communication products. swf RX local oscillator synchronized decoding RX BB DEM (demodulator) IF down-conversion low-noise amplifier sub- Road System UHF / SHF receipt of the letter: receipt of the letter of facilities. swf receipt of the letter: receipt of the letter of facilities. swf BB BB: baseband signal IF: IF UHF: UHF (300 - 3000 MHz) SHF:, anti-jamming capability, ability to adapt to the transmission distortion, spectrum efficiency factors, anti-jamming capability, ability to adapt to the transmission distortion, anti-fading, the signal transmission service, the complexity of the equipment. Anti-fading, the signal transmission service, the complexity of the equipment. For small-capacity system (transmission rate is less than 10Mb / s), to select 4PSK), to select for small-capacity system (transmission rate is less than 10Mb / s), to select 4PSK 4DPSK based also choose 2PSK/2DPSK or 2FSK; main, / 4DPSK based, can also choose 2PSK/2DPSK or 2FSK; capacity for the system (transmission rate greater than 10Mb / s and less than capacity for the system (transmission rate greater than 10Mb / s and less than 100Mb / s ) to select 4PSK/4DPSK based, can also choose to select 4PSK/4DPSK mainly based, 8PSK or 2PSK/2DPSK; 8PSK or 2PSK/2DPSK.There are wireless division department, software development section and new product R&D department in this cell phone jammer company.