Lisnargarvey Mast

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The Lisnargarvey Mast is the mast radiator for the transmission of BBC Radio Ulster in Lisnargarvey, Northern Ireland (national grid reference: J258919). It was built in 1936 and is the only example in the UK of the type known elsewhere as a Blaw-Knox Tower.

The height of the mast is related to the frequency (or wavelength) of the service transmitted, and for maximum efficiency should be exactly one half wavelength. Its height was originally 475 ft (144.8 metres), but it was shortened when the station's broadcast frequency was changed.

Similar masts in Europe can be found nowadays only at Lakihegy, Hungary at Vakarel, Bulgaria and at Stara Zagora, Bulgaria.

There are now two other masts at this site of a more conventional nature, which support suspended wire antennas.

[edit] Channels listed by frequency

• Analogue Radio (AM Mediumwave)
  • 720kHz BBC Radio 4
  • 909kHz BBC Radio Five Live
  • 1089kHz TalkSPORT
  • 1215kHz Virgin Radio
  • 1341kHz BBC Radio Ulster

[edit] External links

• The Transmission Gallery: photographs and information
• http://en.structurae.de/structures/data/index.cfm?ID=s0016174
• http://www.bbc.co.uk/northernireland/bbcandyou/exhibitions/onesmallroom/2.shtml
• http://www.skyscraperpage.com/diagrams/?b47478

[edit] See also

List of masts