Exploring The ADRF PSR-U Series: Code-Compliant Public Safety Repeaters
During an emergency, the ability of first responders to communicate clearly and reliably inside a building can be the difference between a controlled response and a catastrophe. Modern building materials, such as concrete, steel, and low-emissivity glass, often weaken or block crucial radio signals, creating dangerous communication dead zones. These gaps put both emergency personnel and building occupants at significant risk. The ADRF PSR-U Series is engineered to eliminate these coverage gaps, providing a robust and dependable solution for in-building public safety communications.
What is the ADRF PSR-U Series?
The ADRF PSR-U Series is a family of channelized digital public safety repeaters designed specifically for Emergency Responder Communication Enhancement System (ERCES) applications. As the first line of public safety repeaters certified by Underwriters Laboratories to the UL 2524, Second Edition standard, the PSR-U Series establishes the benchmark for safety, performance, and code compliance. These systems ensure that firefighters, police, and EMS crews maintain clear, uninterrupted radio contact throughout any facility, regardless of size, layout, or construction type.
Through our partnership with ADRF, MCA delivers these advanced ERCES solutions, backed by expert engineering, professional installation, and comprehensive lifecycle support. We work with clients to assess their facilities and select the appropriate components from the PSR-U Series to meet the specific requirements of their jurisdiction and the unique challenges of their buildings.
The series combines sophisticated digital signal processing (DSP) with rugged, code-compliant hardware. This ensures reliable coverage across multiple frequency bands, including 700/800 MHz, VHF, and UHF, providing the flexibility needed for small buildings, complex high-rises, and large campus environments.
Advanced Technical Capabilities and Features
The PSR-U Series integrates cutting-edge technology to deliver superior performance and unwavering reliability. Each repeater is engineered to overcome common RF challenges while meeting the stringent demands of public safety codes.
Key Technical Advantages:
- UL 2524 Certified, Second Edition: This certification confirms that the entire system, including the repeater, annunciator, and battery backup, has been rigorously tested as a comprehensive life-safety solution.
- Comprehensive Code Compliance: The series fully adheres to NFPA 72, NFPA 1221/1225, and IFC codes, ensuring acceptance by Authorities Having Jurisdiction (AHJ).
- Digital Signal Processing (DSP): Advanced DSP filtering technology eliminates adjacent channel interference, allowing for precise band selectivity and clear communications, even in congested RF environments.
- High-Performance RF: With up to 95 dB of system gain and downlink power ranging from 28 dBm to 37 dBm, the PSR-U Series provides strong, consistent signal throughout a building.
- P25 Compatibility: The repeaters support both P25 Phase 1 and Phase 2 analog and digital systems, ensuring seamless interoperability with modern public safety radio networks.
Intelligent Safety and Management Features:
- Oscillation Detection: An automatic amplifier shutdown routine prevents system oscillation, protecting the integrity of the public safety network.
- Isolation Check Routine: An integrated function allows technicians to view the isolation value between donor and server antennas directly in the GUI, simplifying setup and optimization.
- Supervised Circuit Alarms: The system provides alarming outputs for critical failures, including loss of AC power, battery charger failure, low battery capacity, donor antenna malfunction, and component malfunction.
- Web-Based GUI: ADRF’s celebrated web-based management interface allows for intuitive configuration, real-time monitoring, and remote troubleshooting, with support for SNMP integration.
PSR-U Series Product Portfolio
The PSR-U Series offers a versatile portfolio of repeaters to address the specific frequency and power requirements of any jurisdiction or facility.
PSR-78-9533-U: 2W 700/800 MHz Repeater
This 2-watt channelized digital repeater is an excellent solution for small to mid-sized buildings. It provides robust coverage for 700/800 MHz public safety frequencies, including full support for FirstNet (Band 14).
- Output Power: Up to 33 dBm downlink and 30 dBm uplink.
- Channel Support: Accommodates up to two wideband or thirty-two non-contiguous narrowband filters.
- Installation: Features an integrated wiring compartment with pre-drilled conduit holes and terminal blocks to simplify and expedite installation.
- Filtering: Employs advanced DSP to ensure clear communication channels, free from interference.
PSR-78-9537-U: 5W 700/800 MHz Repeater
Engineered for larger buildings, multi-story structures, and campus environments, this 5-watt repeater delivers higher power for more demanding coverage scenarios. It provides the same advanced filtering and safety features as the 2W model but with increased output.
- Output Power: Up to 37 dBm downlink and 30 dBm uplink.
- System Gain: Provides up to 95 dB of gain to overcome significant signal loss.
- Durability: Housed in a NEMA 4 enclosure, it is suitable for both indoor and outdoor installations, operating in temperatures from -40°F to +140°F.
- Code Compliance: Fully certified to UL 2524, Second Edition, and compliant with all relevant NFPA and IFC standards.
PSR-VU-9537-U1 & PSR-U-9537-U1: VHF/UHF Repeaters
These repeaters address the needs of jurisdictions that operate on VHF or UHF frequencies. The PSR-VU-9537-U1 supports both bands, while the PSR-U-9537-U1 is dedicated to UHF. They provide essential coverage for legacy public safety systems while meeting modern compliance standards.
- Output Power: Up to 37 dBm for UHF and 28 dBm for VHF.
- Channel Support: Supports one wideband and up to 24 non-contiguous narrowband channels.
- Noise Figure: A low noise figure of less than 3.5 dB ensures a clean signal.
- System Gain: Delivers up to 95 dB of gain for UHF and 85 dB for VHF.
A Complete ERCES Ecosystem
ADRF provides a full suite of certified components that work together to create a fully compliant and reliable ERCES solution.
ADRF-BBU-W Series Battery Backup
Uninterrupted power is critical for life-safety systems. The ADRF-BBU-W is a UL 2524-certified, wall-mountable battery backup unit that ensures the ERCES remains operational during a power outage.
- Configurations: Supports 12V, 24V, and 48V setups to match system requirements.
- Runtime: Provides up to 24 hours of runtime, depending on the connected repeater and battery capacity.
- Battery Options: Available with either sealed lead-acid (AGM) or lighter-weight lithium batteries.
- Enclosure: Housed in a Type 4 / NEMA 4 enclosure for indoor or outdoor mounting.
PSR-EPO-PKG-U Emergency Power-Off Switch
Required by many fire codes, the EPO switch allows first responders to immediately shut down the ERCES to prevent interference with their operations if needed.
- Durability: Rated for a minimum of 1,000,000 operations.
- Weather Resistance: The IP66-rated enclosure is suitable for installation in harsh environments.
- Compatibility: Works seamlessly with the PSR-U Series, FiRe Series, and other ADRF DAS equipment.
Your Partner for Public Safety Compliance
The ADRF PSR-U Series offers a definitive solution for in-building public safety communications. By combining UL 2524, Second Edition certification with a complete ecosystem of repeaters, annunciators, battery backups, and EPO switches, ADRF provides a turnkey system that guarantees AHJ approval and life-safety compliance.
MCA’s role as a technology partner is to ensure customers receive the best solution for their needs. Our certified professionals assess each facility’s unique requirements, evaluate whether the ADRF PSR-U Series or another partner’s solution is the best fit, and provide expert design, installation, and lifecycle support. For building owners, system integrators, and AHJs, this collaborative approach simplifies deployment and ensures reliable coverage. Whether supporting a single building or an entire campus, we provide flexible and scalable paths to public safety compliance tailored to each project.
About MCA
MCA is one of the largest and most trusted technology integrators in the United States, offering world-class voice, data, and security solutions that enhance the quality, safety, and productivity of customers, operations, and lives.
More than 65,000 customers trust MCA to provide carefully researched solutions for a safe, secure, and more efficient workplace. As your trusted advisor, we reduce the time and effort needed to research, install, and maintain the right solutions to make your workplace better.
Our team of certified professionals across the United States delivers a full suite of reliable technologies with a service-first approach. The MCA advantage is our extensive service portfolio to support the solution lifecycle from start to finish.
