RG series coaxial cables mainly include RG59, RG6, RG7, RG11 and other models. The characteristic impedance is 75 ohms to adapt to different transmission distances. It is the main medium for transmitting video signals in asymmetric baseband mode.
The main application areas are: rack connection of equipment, closed circuit television (CCTV), shared antenna system (MATV) and transmission of color or monochrome RF monitors. These applications do not require the selection of precision video coaxial cables with particularly tight electrical tolerances. The characteristic resistance of video coax is 75 ohms, a value not chosen arbitrarily. Physics proves that the optimum attenuation characteristic of the video signal occurs at 77 ohms. In low power applications, materials and design dictate the optimum impedance of the cable to be 75 ohms.
Standard video coaxial cables are available in both solid conductor and stranded conductor designs. Stranded conductor designs are recommended for some applications where the cable is to be bent, such as the internal connection of CCTV cameras to tray and rack assemblies, or the delivery cables for remote cameras.
