SmartCom is designed to provide seamless communications throughout an underground mine or tunnel. The Leaky Feeder cable acts as a mine-wide antenna. It eliminates the need to install and maintain dozens of hardwired cables and signal wires. The RF signals from the Head End, which is usually located on surface, are transmitted throughout the tunnel network over the Leaky Feeder system.
Normally coaxial cable is designed to keep as much signal as possible within the cable,and to block any external signals and noise from penetrating. However Leaky Feeder cable is designed to 'leak' or radiate the RF signal out,as well as allow signals in from any remote radio transceivers within 50 - meters depending on system frequency from the Leaky Feeder cable. To sustain the RF signal levels over long distances,. Line Amplifiers or boosters are inserted along the Leaky feeder cable run, nominally every m.
Where coverage is required in a tunnel off the main drive, such as a ramp, shaft or cross cut, Branch Units may be installed. Here are the latest Insider stories. More Insider Sign Out. Sign In Register. Sign Out Sign In Register. Latest Insider. Message from the President. About Report Back Numbers. ESG Top. Telecom Network. The Leaky coaxial cable is a kind of the coaxial cables, having the outer conductor with periodic slots, and the cable makes part of electric waves propagated through the cable radiate outside by these periodic slots.
The radiant electric field is almost the circular symmetry and can be utilized for the radio communication to moving objects. The generated electric field is confined to around the leaky coaxial cable, therefore the cable can be used very conveniently for the radio communication in the limited extent of roads, tunnels, areas along railways and underground roads etc. Features Tech. The Leaky Coaxial Cables are applicable to all radio communication to moving objects.
This characteristic allows continuous communications along tunnels and branches can be created if necessary. The basic building blocks of a leaky feeder system. Yellow blocks are active components and green blocks, passive components. Active devices use energy and are not limited to the blocks shown.
Other devices can be part of a leaky feeder system; for example, tracking location devices, environmental monitoring sensors, telemetry control, and more specific circuits. The head end combines transmits and receives signals, adapts their impedance to the same as leaky feeder cable, and injects power to the cable.
It also gives the interface to connect the leaky feeder cable and manages different branches for multiple leaky feeder outputs. Amplifiers increase the radio signal in both directions.
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