In-Depth Look at NiceRF's SA618 / SA628 Series – Tailored for Firefighting and Security Communication

The SA618 / SA628 series full-duplex wireless communication modules launched by NiceRF are highly integrated wireless solutions designed for high-reliability voice communication scenarios. These modules integrate a high-speed microcontroller, high-performance RF chip, ESD protection, power overvoltage protection, and a hardware watchdog, ensuring stable and reliable operation even in harsh environments.

The modules support up to 8 channels of simultaneous full-duplex voice communication and feature self-organizing MESH networking capabilities, enabling automatic signal relay and routing to achieve wide-area communication coverage even in complex terrains or multi-obstacle environments.

SA618 / SA628 Full-Duplex Communication Module Specifications Overview
The product line includes the SA618 and SA628 series. Among them, the SA628 series integrates an MCU and application-layer protocol, making it ideal for highly integrated terminal scenarios. It offers various power levels ranging from 160 mW to 8 W, with models such as F22, F30, and F39 available. Each model is further categorized by functionality:

C1 Series: Focuses on high voice quality, suitable for command and dispatch systems requiring clear audio communication.

DZ Series: Supports customizable communication logic, ideal for industry-specific integration and development.

Pro Series: Equipped with a built-in NR60 noise reduction processor, designed for use in noisy environments.

FD Series: Optimized for data transmission, supporting simultaneous voice and data transfer.

Core Features of the Full-Duplex Audio Module

True Simultaneous Talk and Listen
Unlike traditional walkie-talkies that rely on half-duplex communication—where only one person can speak at a time—the SA618/SA628 modules support 8-channel full-duplex concurrent communication. Multiple users can talk and interact in real time, making them especially suited for efficiency-critical scenarios such as command operations, emergency rescue, and maintenance tasks.

Mesh Self-Organizing Network Technology
The modules feature Mesh networking capabilities, enabling automatic signal relaying and path extension between nodes. If a single node's signal is blocked, the system intelligently reroutes through alternate paths, greatly improving coverage and stability in challenging environments like buildings, tunnels, and industrial zones.

Advanced Voice Optimization
To cope with high-noise environments such as industrial sites or emergency scenes, the modules utilize echo cancellation algorithms, AES voice encryption, and NR60 environmental noise reduction (Pro version). These features ensure secure communication while effectively filtering background noise like wind, sirens, and engine sounds.

Robust Security and Protection
The modules support AES encryption to prevent unauthorized eavesdropping. Built-in ESD protection circuits guard against electrostatic discharge, while a hardware watchdog ensures system stability, preventing crashes and ensuring reliable long-term operation.

Flexible Deployment and Fast Integration
With standard TTL/UART interfaces, the modules are highly compatible with mainstream embedded systems. They also support USB-to-serial connections, allowing easy configuration of parameters such as frequency, power, and network settings via dedicated PC software. OTA (Over-the-Air) and serial firmware upgrades are supported, simplifying post-deployment maintenance and feature expansion.

Applications in Firefighting and Special Security Operations

Reliable Communication Inside Fire Scenes: Full-duplex voice communication ensures real-time interaction between the command center and frontline firefighters, allowing critical information to be conveyed without delay.

Team Coordination Support: Group intercom functionality enables multiple firefighter teams to communicate independently without cross-interference.

Stable Communication in Complex Environments: Mesh self-organizing network technology maintains reliable links even in smoke-filled, obstacle-heavy environments such as multi-story buildings.

High Reliability in Harsh Conditions: Multiple protection mechanisms—such as ESD protection, watchdog timer, and power safeguards—ensure the device operates continuously and stably under extreme conditions.

The NiceRF SA618 / SA628 series full-duplex wireless communication modules, with their support for high concurrency, Mesh networking, noise reduction, and a variety of customizable features, are widely adopted in firefighting rescue, special security, and industrial communication fields. Their compact size, high integration, and robust reliability make them an ideal choice for embedding into wireless communication terminals.
For samples and customized solutions, feel free to contact NiceRF Wireless.

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Application of the SA628F30 Full-Duplex Module in Helmet Systems
NiceRF Wireless Analog Walkie-Talkie, Digital Walkie-Talkie, and Full-Duplex Walkie-Talkie Module Product Description Overview of Wireless Walkie-Talkie Modules