Short Answer
Radio in tunnels can involve operational radio, safety communication, POLYCOM/object coverage, maintenance, control center, and emergency processes. Typical technical components include feeder cables, repeaters, antennas, redundant power supply, measurement, and documentation. In Switzerland, it must be checked early whether and which POLYCOM in-house or object coverage is mandatory.
Tunnels are not ordinary buildings. Linear extension, concrete, curves, portals, technical rooms, and safety requirements make radio planning challenging.
Technical Components
- Feeder cables for long tunnel sections.
- Repeaters and amplifiers for defined radio services.
- Measurement before, during, and after implementation.
- Redundancy, power supply, and documentation.
- Delineation of operational radio, mobile radio, and POLYCOM.
POLYCOM and Object Coverage
In Swiss tunnels and comparable infrastructures, POLYCOM radio coverage is often a central mandatory point. Whether and how it is obligatory must be clarified with the responsible authorities. Operational radio for the operator does not replace this clarification.
Typical Errors
The operator only plans their operational radio and realizes too late that emergency services, acceptance, or requirements demand additional object coverage.
FAQ
Why are tunnels difficult for radio?
Radio signals propagate differently in tunnels; curves, concrete, length, and technical rooms create special requirements.
What is a feeder cable?
A special cable that emits and receives radio energy along the tunnel.
Is POLYCOM mandatory in tunnels?
Depending on the infrastructure, canton, and requirements, POLYCOM object coverage can be mandatory. This must be checked early.
Can DMR be useful in tunnels?
Yes, for operator communication, maintenance, or safety teams, but not as a substitute for legally required object coverage.
Sources and Currency
This page was created on 06.07.2026. Technical and regulatory information must be checked against current manufacturer data, standards, frequency specifications, and site conditions for specific projects.