leaky-feeder communication
1Leaky 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… …
2Coaxial 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 …
3Communications-based train control — CBTC deployment in Metro de Madrid, Spain …
4Russia — /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… …
