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  2. List of Marconi wireless stations - Wikipedia

    en.wikipedia.org/wiki/List_of_Marconi_wireless...

    A double antenna tuning inductor house near the summit of Cefn Du and to the rear of the 1914 antenna, served to tune the antenna and earth screens of what were now two parts of a whole antenna, fed at the western transmitter building. The extension also had inductors at the far end, such that each part of the antenna had inductors at its ends.

  3. Antenna tuner - Wikipedia

    en.wikipedia.org/wiki/Antenna_tuner

    An antenna's impedance is different at different frequencies. An antenna tuner matches a radio with a fixed impedance (typically 50 Ohms for modern transceivers) to the combination of the feedline and the antenna; useful when the impedance seen at the input end of the feedline is unknown, complex, or otherwise different from the transceiver.

  4. Transmit diversity - Wikipedia

    en.wikipedia.org/wiki/Transmit_diversity

    Transmit diversity is the use of multiple transmit antennas to achieve reliability in radio communication. [1] It involves using signals that originate from two or more independent sources that have been modulated with identical information-bearing signals and that may vary in their transmission characteristics at any given instant.

  5. List of GM transmissions - Wikipedia

    en.wikipedia.org/wiki/List_of_GM_transmissions

    Borg-Warner R-11 overdrive - 3-speed manual transmission with electric overdrive Ford used them up until 1975 in trucks. Borg-Warner T-50 transmission — 5-speed longitudinal manual - used by GM in its RWD H-Body cars and a few other limited light duty applications from 1976 to 1978;

  6. Omega (navigation system) - Wikipedia

    en.wikipedia.org/wiki/Omega_(navigation_system)

    This is because wavelength is inversely proportional to frequency (wavelength in metres = 299,792,458 / frequency in Hz), and transmitter efficiency is severely degraded if the length of the antenna is shorter than 1/4 wavelength. They used grounded or insulated guyed masts with umbrella antennas, or wire-spans across both valleys and fjords.

  7. Antenna rotator - Wikipedia

    en.wikipedia.org/wiki/Antenna_rotator

    An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...

  8. T2FD antenna - Wikipedia

    en.wikipedia.org/wiki/T2FD_antenna

    A 20-meter-long T²FD antenna, covering the 5-30 MHz band. The T ilted T erminated F olded D ipole ( T²FD , T2FD , or TTFD ) or B alanced T ermination, F olded D ipole ( BTFD ) - also known as W3HH antenna - is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy .

  9. 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 ...

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