Transmission lines

type of cable

specialized cable or other structure designed to carry alternating current of radio frequency

unshielded twisted pair cable for carrying communications signals up to 100 MHz

equations describing the voltage and current on an electrical transmission line

Increase in voltage at a long AC power line

ratio of the amplitudes of voltage and current of a single wave propagating along the line

difference between phase angles

thumb|300 Ohm (unit)|Ω twin-lead

electrical cable

thumb|right|300px|RG-6 coaxial cable for television signals thumb|right|200px|RG-6 coaxial cable RG-6/U is a common type of coaxial cable used in a wide variety of residential and commercial applications. An RG-6/U coaxial cable has a characteristic impedance of 75 ohms. The term, RG-6, is generic and is applied to a wide variety of cable designs, which differ from one another in shielding characteristics, center conductor composition, dielectric type and jacket type. RG was originally a unit indicator for bulk radio frequency (RF) cable in the U.S. military's Joint Electronics Type Designatio

thumb|A section of RG-59 cable with its end stripped.

RG-58/U is a type of coaxial cable often used for low-power signal and RF connections. The cable has a characteristic impedance of either 50 or 52 Ω. "RG" was originally a unit indicator for bulk RF cable in the U.S. military's Joint Electronics Type Designation System. There are several versions covering the differences in core material (solid or braided wire) and shield (70% to 95% coverage).