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High Frequency Audio&Vedio Cable And Transmission Means Different From The Transmission Line Has A Large Jul 20, 2017

High frequency Audio&Vedio Cable is generally used in the configuration of the electric head, electric lens camera device, in use, need to install remote control decoder in the field. Field of the decoder and the control center of the video matrix switch between the host communication transmission cable, generally use 2-core shielded High frequency Audio&Vedio Cable (RVVP) or 3 types of twisted pair UTP, each core cross-sectional area of 0.3mm2 ~ 0.5mm2. The basic principle of choosing a High frequency Audio&Vedio Cable is that the longer the distance, the larger the diameter. For example: RS-485 communication provides the basic communication distance is 1200m, but in the actual project selection RVV2-1.5 jacket line can extend the communication length to 2000m above. When the communication distance is too long, use RS-485 communication repeater.

Video signal can also be used twisted pair transmission, which uses twisted pair transmission equipment. In some special applications, twisted pair transmission equipment is essential. (RJ45 or RJ11) in the relevant rooms when the large number of twisted pairs (standard three or five lines) are laid in the building according to the integrated wiring standard. Increased cable TV monitoring equipment without re-wiring, High frequency Audio&Vedio Cablevideo and audio signals and control signals can be transmitted through the twisted pair, which will use the transmission of video signals twisted pair transmission equipment. In addition to the laying of twisted pair (or two-core jacket line) and the need to front-end camera images to the control room equipment applications, also need to use twisted pair transmission equipment. The function of the twisted pair video transmission equipment is to convert the video signal suitable for unbalanced transmission (that is, suitable for 75Ω coaxial cable transmission) at the front end into a video signal suitable for balanced transmission (ie, suitable for twisted pair transmission); In contrast to the front end, the video signal transmitted through the twisted pair is re-converted into an unbalanced video signal. Twisted-pair transmission equipment itself has a video amplification, and therefore also suitable for long-distance signal transmission. For the above different transmission methods, the use of transmission components and transmission lines are quite different.

Video cable refers to the transmission of video signals (VIDEO) cable, can be used as a monitoring system for signal transmission. General model: SYV75-X (X on behalf of its insulation diameter 3mm / 5mm, the greater the larger the diameter of the larger) SYV S --- coaxial RF cable, Y --- polyethylene, V --- poly Ethylene 75 indicates the characteristic impedance, the video line is 75-3 (100 meters) can work the normal transmission distance 75-5 (300 meters) can work the normal transmission distance 75-7 (500-800 meters) can work the normal transmission Distance 75-9 (1000-1500 meters) can work normally the transmission distance commonly used models are generally SYV75-5, the same manufacturers may also provide different price products,High frequency Audio&Vedio Cable the specific difference is that the copper used is copper or copper clad aluminum , Or outside the shield copper core number, such as: 96 series (referring to 96 fine copper core weaving), 128 series, etc., the more the number of shielding performance is better, so this need to pay attention to the procurement of products.