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RG-59/U is a specific type of coaxial cable, often used for low-power video and RF signal connections. The cable has a characteristic impedance of 75 ohms, and a capacitance of around 20pF/ft (60pF/m). [1]
Used by early home computers and game consoles to connect them to TVs because of the lack of any other connector. Generally not used in North America. BNC: Alternative to RCA for professional video electronics. Protocols: Serial digital interface (SDI) and HD-SDI. CoaXPress; 75 Ω for video signal (SDI and CoaXPress) on, for example, RG59 and RG6.
The RG-11 cable is the largest in diameter and harder to work with. The RG-6 and RG-7 sizes are between the RG59 and RG11. The difference between the RG types are not just size, but also the attenuation characteristics and therefore the transmission distance. Typically, the coax cable transmission limitations for CCTV will be as follows:
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Likewise with CATV, although many broadcast TV installations and CATV headends use 300 Ω folded dipole antennas to receive off-the-air signals, 75 Ω coax makes a convenient 4:1 balun transformer for these as well as possessing low attenuation. The arithmetic mean between 30 Ω and 77 Ω is 53.5 Ω; the geometric mean is 48 Ω. The selection ...
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