Service

BDA / DAS | Emergency Responder Radio Communication Systems (ERRCS)

Bi-Directional Amplifier and Distributed Antenna Systems that boost first-responder radio signal where building construction degrades it.

What we deliver

AHJ-driven design and dBm signal evaluation
BDA / DAS installation, commissioning, and acceptance testing
Fire-alarm-interfaced monitoring of critical BDA components
AC power, battery, signal loss, antenna loss, and trouble supervision
Annual inspection and compliance documentation

Firefighter using a two-way radio inside a building — First-responder radio communication must reach every floor — BDA / DAS ensures it.

Recent changes to the National Fire Code require reliable two-way radio communication for first responders inside buildings. When building height, construction, or size degrades that signal, a Bi-Directional Amplifier (BDA) and Distributed Antenna System (DAS) restore it. Your Fire Department or AHJ determines whether your building needs one based on measured or expected signal loss in dBm.

Diagram of a typical BDA system showing donor antenna, bi-directional amplifier, coaxial cable, power dividers, fire alarm control panel, BDA annunciator panel, and DAS antennas — Typical BDA system components: donor antenna, BDA, FACP, annunciator, and in-building DAS antennas.

Buildings that commonly require BDA / DAS:

High-rise apartments and condos over 5 stories
Large office buildings
Hotels over 5 floors
Assisted living facilities
Hospitals and medical office buildings
Educational buildings over 5 floors
Government buildings
Multi-use condo / hotel developments

Hotel staff member using a two-way radio in a conference center lobby — In hotels and conference centers, BDA / DAS keeps both first-responder and operations radios reliable on every floor.

Fire chief working from a command vehicle laptop with portable radio at his side — Fireground command depends on uninterrupted radio.

Mobile radios mounted in a fire apparatus cab — Apparatus, portable, and DAS antennas all on one signal path.

Maritech also provides the required fire-alarm-interfaced monitoring of critical BDA components, including AC power, backup battery, signal loss, antenna loss, and general trouble, so the system stays compliant long after commissioning.

Illustration of a BDA system linking a public safety radio repeater, donor antenna, signal booster, DAS antennas, fireground command, and the building fire alarm control panel — How a BDA links the public-safety radio repeater to fireground command and every floor of the building.

Motorola public-safety portable radio with remote speaker microphone

Find out if your building needs BDA / DAS

We can survey your building, evaluate radio signal strength, and coordinate directly with your AHJ.

Need a system designed, serviced, or inspected?

Talk to a licensed Maritech specialist. We cover all of South Florida.

Request Service Call 24/7: (954) 447-1200