Underground Radio Communications
 and Tracking

State-of-the-art radiowave voice and data communications and tracking

Rapid entry into an underground structure requires emergency communications to coordinate assigned tasks. The radio communication system transceivers have been designed with resonant loop antennas to communicate triple-mode electromagnetic waves in the underground complex. The electrical utilities such as AC power/telephone cable, air/hydro pipe and track create a low attenuation rate (1 dB per kilometer at 100 kHz) transmission network through-the-earth underground complex. Through-the-earth signals enable communications and tracking with the EM gradiometer system.

 

 

 

 

 

 

 

Features

Not restricted to line of sight.

Can communicate through rock and reinforced concrete.

Rapid deployment because of the presence of previously installed utility conveyors and power cable.

Intrinsically safe design allows communications in an explosive atmosphere.

Transmitters can monitor underground machines and environment.

EM gradiometer can track and locate miners underground.

EM Interferometer for in-mine tracking.

Stolar Research Corporation (Stolar) designs a complete line of underground communications for voice and data. Whether you need to communicate with a miner underground, an engineer in his jeep,
or your entire crew, there’s a Stolar radio for the job.

Personal radios

The personal radio allows its user to communicate underground and with radios on the surface. It can be worn on a belt attached to a suspender antenna or carried along with a bandolier antenna. Batteries are recharged
and exchanged. A variety of speakers/microphones is available.

 

Repeaters

When you specify the Stolar system, you provide your underground crew
with an unlimited communications range. The FI/FI Repeater Network is powered by an internal 12V battery that is continually charged.
Repeaters receive signals from radios and other repeaters.
The signals are amplified and retransmitted.