75-3和75-5视频线参数（75-3 and 75-5 video line parameters）.docVIP

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75-3和75-5视频线参数（75-3 and 75-5 video line parameters）.doc

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75-3和75-5视频线参数（75-3 and 75-5 video line parameters）

75-3和75-5视频线参数（75-3 and 75-5 video line parameters） 75-3 and 75-5 video line parameters The coaxial cable has the advantages of low cost, convenient laying (relative to the optical fiber), so the general monitoring system in small range, the transmission distance is very close, the use of coaxial cable transmission directly monitoring image with little damage on the image quality, can satisfy the actual request. However, according to the analysis of the characteristic of the coaxial cable, when the signal transmission in the coaxial cable in the attenuation and the transmission distance and the frequency of the signal itself. Generally speaking, the higher the frequency, the greater the attenuation. Video signal bandwidth is large, up to 6MHz, and the color image part is modulated at high frequency, so that the video signal transmission in a coaxial cable not only signal amplitude of each frequency component is attenuated and the attenuation varies greatly, especially the color part of the maximum attenuation. So, the coaxial cable is only suitable for short distance transmission of image signal, when the transmission distance is 200 meters, the image quality will be significantly decreased, especially the color dim, distortion sense. In engineering practice, in order to extend the transmission distance, to use the coaxial amplifier. Coaxial amplifier has certain amplification of the video signal, and also through the balanced adjustment of the different frequency components of different sizes respectively compensation to make the video signal of the receiver output distortion as small as possible. However, the coaxial amplifier cannot limit and cascade, generally in a coaxial point-to-point system amplifier can only cascade 2 to 3, otherwise it is impossible to ensure the quality of video transmission, and it is very difficult to adjust. Therefore, the use of coaxial cable in the monitoring system, in order to ensure a good image quality, the transmission distance