510.4 Technical Requirements
If used, signal boosters shall meet the following requirements:
- All signal booster components shall be contained in a National Electrical Manufacturer's Association (NEMA) 4-type waterproof cabinet.
- Battery systems used for the emergency power source shall be contained in a NEMA 3R or higher-rated cabinet.
- Equipment shall have FCC or other radio licensing authority certification and be suitable for public safety use prior to installation.
- Where a donor antenna exists, isolation shall be maintained between the donor antenna and all inside antennas to not less than 20dB greater than the system gain under all operating conditions.
- Bi-Directional Amplifiers (BDAs) used in emergency responder radio coverage systems shall have oscillation prevention circuitry.
- The installation of amplification systems or systems that operate on or provide the means to cause interference on any emergency responder radio coverage networks shall be coordinated and approved by the fire code official.
The emergency responder radio enhancement system shall be monitored by a listed fire alarm control unit, or where approved by the fire code official, shall sound an audible signal at a constantly attended on-site location. Automatic supervisory signals shall include the following:
- Loss of normal AC power supply.
- System battery charger(s) failure.
- Malfunction of the donor antenna(s).
- Failure of active RF-emitting device(s).
- Low-battery capacity at 70-percent reduction of operating capacity.
- Failure of critical system components.
- The communications link between the fire alarm system and the emergency responder radio enhancement system.
- Class A narrow band signal booster devices with independent AGC/ALC circuits per channel.
- Systems where all portable devices within the same band use active power control features.