introduce the three major categories of CCTV Cables.
1. CCTV Coaxial Cable
CCTV Coaxial cable mainly uses solid polyethylene insulated 75Ω radio frequency coaxial cable to transmit video signals. When selecting
the type, the attenuation and anti-interference of video signals are mainly considered. The length of the transmission distance of each specification
and type of wire is related to the front and rear equipment, site conditions and construction quality. The unevenness of the color TV baseband signal
frequency point at 5.5MHz shall not be greater than 3dB, otherwise a cable equalizer is required. However, in actual projects, due to the limitation of
detection conditions, the acceptance is mostly subjectively evaluated according to the image level 5 damage standard. When conditions are possible,
a signal compensator can be added on the line to extend the transmission distance, but generally no compensator is used. The cascade use.
2. Optical Fiber CCTV Cable
Optical fiber CCTV Cable is the best choice for long-distance transmission, and the signal transmission process is free from electromagnetic
interference. For established living communities and other areas that are not convenient for re-ditching and trenching, the overhead
co-transmission of optical fiber and power supply cables is the smallest and sometimes the only option. When lightning protection is required,
metal-free optical fiber CCTV Cable should be used.
3. 100Ω digital communication CCTV Cable
Digital communication CCTV Cable used in CCTV system should pay attention to two parameters: ①Because the capacitance has high conductivity,
too large capacitance has a strong suppression effect on low-frequency signals, and the distributed capacitance of the cable must be less than 60pF/m; ②The loop
of the twisted pair cable The resistance must be less than 18Ω/100m. These two parameters directly affect the transmission distance and the degree of distortion
of the image.
The above are the three major categories of CCTV Cables. Everyone can choose different categories according to different conditions while applying
them, so that CCTV Cables can be fully utilized.