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Analysis of the advantages and disadvantages of coaxial cable

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-02-27

Coaxial cable has the advantages of low price, the laying of more convenient (relative to the optical fiber), so, generally in the monitoring system of small scale, the transmission distance is very near, the use of coaxial cable is transmitted directly monitoring image with little damage to the image quality, can meet the practical requirements of.

However, according to the analysis of the characteristics of coaxial cable, when the signal transmission in the coaxial cable in the attenuation and the transmission distance and the signal itself is related to the frequency. Generally speaking, the higher the frequency, the attenuation is greater. Video signal bandwidth is very large, up to 6MHz, and, the image's color part is modulated at high frequency, so, the video signal transmission in the coaxial cable is not only the overall amplitude signal is attenuated, and each frequency component attenuation vary greatly, especially the color of maximum attenuation. So, the coaxial cable is only suitable for short distance transmission image signal, when the transmission distance can reach 200 meters, the image quality will be significantly decreased, especially the color becomes dark, a distortion sense.

In engineering practice, in order to extend the transmission distance, to use coaxial amplifier. Coaxial amplifier has some amplification of the video signal, and also by isostatic adjustment on different frequency components of different sizes respectively compensation, in order to make the video signal receiver output distortion as small as possible. However, the coaxial amplifier and can not be unlimited cascade, general coaxial in a point-to-point system amplifier can cascade from 2 to 3, otherwise it can not guarantee the quality of video transmission, and also very difficult to adjust. Therefore, the use of coaxial cable in the monitoring system, in order to guarantee a good image quality, the transmission distance is limited within four, five hundred meters.

In addition, coaxial cable transmission image signal in the monitoring system also exists some disadvantages:
1) coaxial cable is affected by climate change, the image quality will be affected;
2) coaxial coarse, in the intensive monitoring application wiring inconvenient;
3) coaxial cable generally only video signal, control data, audio signal transmission at the same time if the system is needed, you will need additional wiring;
4) anti-interference coaxial cable Co., cannot be used in strong interference environment;
5) coaxial amplifier has to adjust the difficulty.

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