When a personâs blood cells are not carrying enough oxygen through the body, the color of the blood cells changes from bright red to a darker bluish color. Because the blood flowing through the skin is a bluish color, it causes the person to develop a blueness of the skin, lips, or fingernail beds.
Twin-lead â This type of cable is a flat two-wire line. It is commonly called a 300 Ï line because the line has an impedance of 300 Ï. It is often used as a transmission line between an antenna and a receiver (e.g., TV and radio). These cables are stranded to lower skin effects.
The two major types of feedline for time-varying electrical signals are parallel conductors (ladder line, twin lead, or twisted pair) and coaxial cable (coax).ompared to twisted-pair, coax provides greater bandwidth systemwide, and it also offers greater bandwidth for each channel. Because it has greater bandwidth per channel, it supports a mixed range of services.