Twin-lead is a two-conductor
ribbon cable of 300
ohms characteristic
impedance commonly used as a
transmission line for
balanced connection of
television antennas to their receiving antennas.It has the advantage that it can be connected directly to a suitably designed
dipole (~75 ohm resonant impedance, or a folded dipole with a better match at 300 ohms),
yagi or similar balanced antenna, and was universally used for feedlines to outside antennas. However recently 300 ohm twin lead for television installations has been largely replaced with 75-ohm
coaxial cable feedlines.
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