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  2. G5RV antenna - Wikipedia

    en.wikipedia.org/wiki/G5RV_antenna

    The G5RV antenna is a dipole with a symmetric resonant [1] ... (ladder-line or twin-lead) can be either 300 Ω (8.84 metres or 29.0 feet) or 450 Ω ...

  3. Twin-lead - Wikipedia

    en.wikipedia.org/wiki/Twin-lead

    Ladder line is an older, simpler form of parallel-wire line, often called open wire line. The configuration looks like a rope ladder , hence the name. It can either be purchased already made by a cable company, or home-made ; the construction is easy, though tedious, and originally all radio amateurs made their own open wire line.

  4. 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. The sloper antenna is a slanted vertical dipole antenna attached to the top of a single tower. The element ...

  5. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    "Straight-wire" or "straight-line" antennas ... for the extra working frequencies is the needed to match a feed impedance 5–7 times higher than the standard 50 Ohm ...

  6. Antenna feed - Wikipedia

    en.wikipedia.org/wiki/Antenna_feed

    In a radio antenna, the feed line ... 450 95–99 ladder line open wire line 500–600 ... designed to feed 50 ohm coaxial cable.

  7. Radio transmitter design - Wikipedia

    en.wikipedia.org/wiki/Radio_transmitter_design

    Transmitters feeding a balanced transmission line will need a balun. This transforms the single ended output of the transmitter to a higher impedance balanced output. High power short wave transmission systems typically use 300 ohm balanced lines between the transmitter and antenna. Amateurs often use 300–450 ohm balanced antenna feeders.

  8. T2FD antenna - Wikipedia

    en.wikipedia.org/wiki/T2FD_antenna

    The balun is a 16:1 ratio, thereby transforming the 50 Ω (ohm) coax to an 800 Ω feed at the antenna. The resistor load is also 800 Ω , non-inductive. This allows the antenna impedance to swing from 400–1,600 Ω over the frequency range intended and thus keep the SWR at the transmitter 2:1 or lower.

  9. Yagi–Uda antenna - Wikipedia

    en.wikipedia.org/wiki/Yagi–Uda_antenna

    The experimental Morgenstern German AI VHF-band radar antenna of 1943–44 used a "double-Yagi" structure from its 90° angled pairs of Yagi antennas formed from six discrete dipole elements, making it possible to fit the array within a conical, rubber-covered plywood radome on an aircraft's nose, with the extreme tips of the Morgenstern's ...

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