Leaky feeder

A leaky feeder is a communications system used in underground mining and other tunnel environments. It consists of a cable run along drivages which emits and receives radio waves. The system has a limited range and because of the high frequency it uses, transmissions cannot pass through solid rock, which limits the system to a line of sight application. It does, however, allow two-way mobile communication.

This system is also used for underground mobile communication in mass transit railways. In Hong Kong the leaky feeder aerial was incorporated in the specification of the capital project and installed during construction. This allows emergency services seamless mobile communication from the underground to the surface.

In London, London Underground use a leaky feeder system for their internal communication network. The emergency services' communications system however is not compatible and does not work underground. That this situation continued to exist after the 1987 King's Cross fire was criticised in reports into the 7 July 2005 London bombings, where it hampered rescue efforts.

ee also

Tunnel transmitter

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Coaxial cable — RG 59 flexible coaxial cable composed of: A: outer plastic sheath B: woven copper shield C: inner dielectric insulator D: copper core Coaxial cable, or coax, has an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by …   Wikipedia

  • UKC Radio — was the student radio station for the University of Kent at Canterbury (UKC) between 1966 and 2006. It was operated as a student service by the University of Kent Students Union.It was replaced by CSR FM [ [http://www.csrfm.com/ CSR 97.4FM :… …   Wikipedia

  • Woolwich foot tunnel — The Woolwich foot tunnel is a tunnel crossing under the River Thames in South East London from Woolwich in the London Borough of Greenwich to North Woolwich in the London Borough of Newham. The tunnel offers pedestrians an alternative way to… …   Wikipedia

  • Sistema CBTC — CBTC en Metro de Madrid, España …   Wikipedia Español

  • Communications-based train control — CBTC deployment in Metro de Madrid, Spain …   Wikipedia

  • Transformer — This article is about the electrical device. For the toy line franchise, see Transformers. For other uses, see Transformer (disambiguation). Pole mounted distribution transformer with center tapped secondary winding. This type of transformer is… …   Wikipedia

  • 2007 New York City steam explosion — Rising steam from the explosion The cloud of steam, from th …   Wikipedia

  • Russia — /rush euh/, n. 1. Also called Russian Empire. Russian, Rossiya. a former empire in E Europe and N and W Asia: overthrown by the Russian Revolution 1917. Cap.: St. Petersburg (1703 1917). 2. See Union of Soviet Socialist Republics. 3. See Russian… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.