UQOMM
Leaky Feeder:
Continuous communication in mines and tunnels
The benchmark underground‑mining communication system for over 50 years. At UQOMM, we design, integrate, and maintain these systems for the most demanding operations worldwide.
UQOMM
What is Leaky Feeder and why it is considered the benchmark technology
Leaky Feeder—also referred to as low‑frequency radiating cable—is a coaxial medium engineered with precisely controlled openings in its outer conductor. These openings function as distributed antenna elements that emit RF signals uniformly along the cable. This enables continuous coverage over kilometers of underground galleries, including curves, elevation changes, and complex junctions.
In contrast to conventional antennas that provide coverage from fixed points, Leaky Feeder transforms the entire cable route into a continuous communication corridor. This ensures consistent signal quality from the surface to the deepest production areas, eliminating dead zones and minimizing potential failure points.
Originally developed for mining in the 1960s, Leaky Feeder has proven its reliability for more than five decades in real‑world underground operations. At UQOMM, we design, integrate, maintain, and tailor these systems to each site’s architecture, supported by over thirty years of global experience.
UQOMM
How the Leaky Feeder system works
A complete Leaky Feeder system is composed of four main elements:
Technology
Frequency and standards compatibility
Leaky Feeder operates in frequency bands between 70 MHz and 900 MHz, making it compatible with the main professional communication standards:
| Standard | Frequency band | Typical application | Compatible with LF |
|---|---|---|---|
| TETRA | 380–400 MHz / 410–430 MHz | Trunked radio for emergency and mining | Native |
| DMR (Digital Mobile Radio) | 136–174 MHz / 400–512 MHz | Professional digital radio | Native |
| Analog VHF/UHF | VHF 136 a 174 MHz UHF 400 a 512 MHz |
Legacy portable radios | Native |
| P25 (APCO-25) | 136-939 MHz | North American emergency standard | With adapter |
| LTE (data) | 700–900 MHz | Broadband for data/automation | Dual configuration |
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Where is Leaky Feeder used?
Mining
Tunnels
Metro
Buildings
Offshore
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Technologies
Leaky Feeder
in underground mining
Underground mining is the environment for which Leaky Feeder was originally conceived and where it reaches its full potential. Its ability to expand alongside the advancing production front, together with its compatibility with all mining radio systems, makes it the backbone of any responsible underground operation.
- Voice coverage from the surface to the deepest active face
- Integration with personnel tracking and evacuation systems
- Compatibility with TETRA standards required by regulations such as Chile’s DS‑132
- Dynamic scalability: it extends as the mine advances
Leaky Feeder
in vehicular tunnels
In vehicular tunnels, Leaky Feeder is the reference solution for emergency radio services: firefighters, police, and civil protection require guaranteed coverage throughout the entire length of the tunnel. It is generally installed in combination with a DAS system that also extends public mobile telephony.
- Compliance with road‑safety regulations for tunnels longer than 500 m
- Emergency radio coverage without dead zones along the entire tunnel
- Robust design for environments with exhaust gases and high humidity
Leaky Feeder
in underground metro systems
Underground metro systems rely on Leaky Feeder to maintain uninterrupted RF coverage along tunnels, enabling smooth signal transitions as trains move between cable segments. In stations, it is complemented by DAS platforms to deliver comprehensive multiband coverage.
- Support for GSM‑R and TETRA railway communication standards
- End‑to‑end coverage continuity during high‑speed train travel
- Integration with CBTC (Communications‑Based Train Control)
UQOMM
Why choose UQOMM for your Leaky Feeder project
30+ years of active installations
We know every terrain variant, regulation, and radio standard. No project presents technical surprises for our team.
Specialized integrator
We design the complete system architecture, integrating Leaky Feeder with the operation, regulatory requirements, and existing technologies. Every project is based on a dedicated engineering design.
Teams in key markets
Local presence in Chile, Peru, Mexico and other regions enables preventive maintenance and rapid incident response.
Multi-technology integration
We integrate Leaky Feeder with telemetry, telecontrol, IoT, Private LTE, and SCADA systems to build a unified communication architecture for each operation.
Guaranteed regulatory compliance
Every installation meets the regulatory requirements of the country: SERNAGEOMIN, MHSA, WHS. The client does not need to manage compliance.
UQOMM
FAQ
1. What is Leaky Feeder and how does it work in a mine?
Leaky Feeder, or radiating cable, is a coaxial cable with controlled slots in its shielding that distribute radio signals continuously along its entire length. It is installed throughout the mine’s galleries and acts as an extended antenna that eliminates coverage gaps. Unlike conventional antennas, which transmit from a fixed point, Leaky Feeder provides uniform coverage from the mine entrance to the deepest working faces. It is the reference technology for mining communications due to its proven reliability for more than 50 years.
2. How many kilometers can a Leaky Feeder system reach?
A Leaky Feeder system has no practical length limit. Repeater amplifiers, installed approximately every 350 to 500 meters, regenerate the signal and allow coverage to be extended throughout the entire operation. We have deployed systems exceeding 22 kilometers within a single mine. The final length depends on the type of cable, the operating frequency, and the minimum signal level required. As the mine expands, we extend the network by adding new cable sections and amplifiers.
3. Does Leaky Feeder work with the radios we already have?
Yes. Leaky Feeder is compatible with multiple radio standards, including TETRA, DMR, and analog VHF/UHF. We analyze the frequency band and the standard used in each operation to design a fully compatible solution. In most projects, we reuse existing terminals, reducing costs and accelerating deployment.
4. What happens if the cable is damaged at some point in the gallery?
A physical break affects only the section after the failure point. Our monitoring systems automatically detect the loss of signal, trigger an alarm, and provide an approximate location of the incident. The repair follows a standard procedure that the mine’s maintenance team can carry out, allowing service to be restored in very short time.
5. Leaky Feeder or Wi Fi: which is better for a mine?
They are not mutually exclusive technologies; they complement each other. Leaky Feeder provides continuous coverage for voice communications and emergency radio, while Wi‑Fi delivers data connectivity for automation, video surveillance, and telemetry. We design hybrid architectures in which each technology fulfills the role where it delivers the best performance, resulting in a more robust communications infrastructure that is fully prepared for the growth of the operation.
6. How much does it cost to install a Leaky Feeder system?
The cost depends on the length of the galleries, the radio standard required, the installation conditions, and the integration with other systems. Each project is based on a custom engineering design, so we conduct a technical assessment beforehand and deliver a detailed budget. A properly engineered communications infrastructure reduces operational risk, improves service continuity, and facilitates regulatory compliance throughout the entire life cycle of the operation.
Caso de éxito
Mina subterránea de cobre, Chile
Sistema Leaky Feeder de 22 km de galería conectada con cobertura continua de voz y datos DMR. Integración con sistema de localización de personal y alarmas de evacuación. Tiempo de respuesta ante emergencias reducido en un 65%. Cumplimiento normativo SERNAGEOMIN (Servicio Nacional de Geología y Minería) desde el primer día de operación. Sistema en funcionamiento continuo desde 2019.
Ver caso completo
Tecnologías desplegadas
Leaky Feeder DMR + monitoreo remoto + integración con DRS para redundancia automática y segregación de redes.
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Complementary Technologies
Leaky Feeder integrates natively with the rest of UQOMM’s technology portfolio:
Technology
Private LTE Technology
How it combines with Leaky Feeder:
It adds a high‑speed data layer for automation and video over the same underground network infrastructure.
Technology
IoT Technology for Mining
How it combines with Leaky Feeder:
Gas, temperature, and tracking sensors use Leaky Feeder coverage to transmit real‑time data.
Technology
DAS/DRS Technology
How it combines with Leaky Feeder:
In metro tunnels and station areas, it complements Leaky Feeder in high‑density zones.
Technology
Digital Mining Technology
How it combines with Leaky Feeder:
Leaky Feeder is the connectivity layer on which the smart mine is built.