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  2. Twin-lead - Wikipedia

    en.wikipedia.org/wiki/Twin-lead

    For this reason, when attaching a twin-lead line to a coaxial cable connection, such as the 300 Ω twin-lead from a domestic television antenna to the television's 75 ohm coax antenna input, a balun with a 4:1 ratio is commonly used. Its purpose is double: First, it transforms twin-lead's 300 Ω impedance to match the 75 Ω coaxial cable ...

  3. Ribbon cable - Wikipedia

    en.wikipedia.org/wiki/Ribbon_cable

    The original form of ribbon cable was two-conductor 300 ohm twin lead cable used for radio and television, which is also called "ribbon cable". However the more modern forms more commonly called "ribbon cable" typically have many more than just two conductors.

  4. Television antenna - Wikipedia

    en.wikipedia.org/wiki/Television_antenna

    Earlier antennas used a flat cable called 300 ohm twin-lead. The standard today is 75 ohm coaxial cable, which is less susceptible to interference which plugs into an F connector or Belling-Lee connector (depending on region) on the back of the TV. [6] To convert the signal from antennas that use a twin-lead line to the modern coaxial cable ...

  5. Impedance matching - Wikipedia

    en.wikipedia.org/wiki/Impedance_matching

    This transformer allows interfacing a balanced line (300-ohm twin-lead) and an unbalanced line (75-ohm coaxial cable such as RG-6). To match the impedances, both cables must be connected to a matching transformer with a turns ratio of 2:1.

  6. Dipole antenna - Wikipedia

    en.wikipedia.org/wiki/Dipole_antenna

    The G5RV antenna is a dipole antenna fed indirectly, through a carefully chosen length of 300 Ω or 450 Ω twin lead, which acts as an impedance matching network to connect (through a balun) to a standard 50 Ω coaxial transmission line.

  7. Balanced line - Wikipedia

    en.wikipedia.org/wiki/Balanced_line

    A signal transmitted over a balanced line. The signal is kept intact while the noise (which appears as a common-mode signal at the receiving end) is rejected perfectly.. In telecommunications and professional audio, a balanced line or balanced signal pair is an electrical circuit consisting of two conductors of the same type, both of which have equal impedances along their lengths, to ground ...

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  9. G5RV antenna - Wikipedia

    en.wikipedia.org/wiki/G5RV_antenna

    The dipole elements are 15.55 metres (51.0 ft) and the impedance-matching symmetric feedline (ladder-line or twin-lead) can be either 300 Ω (8.84 metres or 29.0 feet) or 450 Ω (10.36 metres or 34.0 feet). [7]

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