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  2. List of VLF-transmitters - Wikipedia

    en.wikipedia.org/wiki/List_of_VLF-transmitters

    used before World War II three 287 metres, today active on higher frequency with an antenna of four masts with heights of 121 and 122 metres JXN: Gildeskål, Norway: 16.4 kHz: 7,759-foot (2,365 m) valley-span antenna VTX: Vijayanarayanam, India: 17.0 kHz

  3. Transmitter station - Wikipedia

    en.wikipedia.org/wiki/Transmitter_station

    They all have masts or towers to install antenna systems. In most cases, the mast is a passive structure to support the antennas. But in low frequency stations (such as AM radio), the mast itself may be the active antenna element. In such cases, the mast is isolated from the ground.(See Monopole antenna). If the mast itself is an active antenna ...

  4. Amateur radio repeater - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_repeater

    The actual frequency pair used is assigned by a local frequency coordinating council. In the days of crystal-controlled radios, these pairs were identified by the last portion of the transmit (Input) frequency followed by the last portion of the receive (Output) frequency that the ham would put into the radio. Thus "three-four nine-four" (34/94 ...

  5. Radio masts and towers - Wikipedia

    en.wikipedia.org/wiki/Radio_masts_and_towers

    A mast radiator or mast antenna is a radio tower or mast in which the whole structure is an antenna. Mast antennas are the transmitting antennas typical for long or medium wave broadcasting. Structurally, the only difference is that some mast radiators require the mast base to be insulated from the ground.

  6. List of transmission sites - Wikipedia

    en.wikipedia.org/wiki/List_of_transmission_sites

    Mediumwave (AM Radio) LW: Longwave: FM: FM broadcasting: DAB: Digital Audio Broadcasting (digital radio) DVB-T: Digital Video Broadcasting – Terrestrial (digital terrestrial television) DVB-H: Digital Video Broadcasting – Handhelds (digital television for hand-held receivers) VHF: Very high frequency (Television) UHF: Ultra high frequency ...

  7. VLF Transmitter Cutler - Wikipedia

    en.wikipedia.org/wiki/VLF_Transmitter_Cutler

    The two arrays normally operate together as one antenna, but each is designed to function independently to allow maintenance on the other array. The central tower of each antenna system is 304 m (997.4 ft) tall. It is surrounded by six 266.7 m (875 ft) tall masts, placed on a ring with a radius of 556 m around the central tower.

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