RadioMaster ER16 PWM - Dual-Band GEMINI and GEMINI-X Receiver
by RadioMaster

The RadioMaster ER16 PWM - Dual-Band GEMINI and GEMINI-X Receiver is an advanced, enterprise-grade ExpressLRS receiver designed for large-scale aerobatic planes, giant-scale models, complex scale aircraft, and demanding fixed-wing installations. Utilizing dual-band GEMINI-X RF architecture, the ER16 operates simultaneously on 2.4GHz and Sub-G 900MHz frequencies to deliver extreme link redundancy, low latency, and maximum interference rejection in congested RF environments.

Engineered as a complete avionics and power distribution hub, the ER16 features 16 top-mounted, amplified PWM outputs designed to drive long servo leads and high-torque digital servos without signal degradation. It introduces dual isolated XT30 power inputs for true dual-battery redundancy—if one battery or power path fails, the receiver seamlessly continues operating on the remaining supply. Equipped with four independent voltage telemetry channels (EXT-V up to 70V, V-PWM, and dual XT30 inputs), an external safety switch port, up to 100mW telemetry output power, and CRSF/SBUS serial capabilities, the ER16 offers uncompromised protection and control for mission-critical airframes.

Key Features

• Dual-Band GEMINI-X RF System: Operates on 2.4GHz and Sub-G 900MHz bands concurrently for true diversity and maximum signal penetration.

• 16 Top-Mounted Amplified PWM Channels: Top-side pin layout simplifies cable routing in large airframes while signal amplification prevents voltage drop across long servo extensions.

• Dual Isolated XT30 Redundant Power Inputs: Accepts two independent battery power sources with dedicated telemetry monitoring and auto-failover if one battery drops.

• Four-Source Voltage Telemetry: Independently monitors EXT-V (up to 70V main pack), V-PWM/Receiver supply (up to 12V), XT30-1 (up to 12V), and XT30-2 (up to 12V).

• External Safety Switch (SW) Port: Connects an optional pull-tab or external safety switch module to keep the receiver inactive until intentional pre-flight activation.

• Adjustable 100mW Telemetry Power: Transmits real-time flight metrics back to the radio with selectable power up to 100mW configured via ExpressLRS LUA script.

• CRSF & SBUS Serial Connectivity: Features dedicated bidirectional UART and serial output ports for external flight controllers, sensors, and expansion modules.

• Wi-Fi Firmware Updates & WebUI: Allows wireless configuration and OTA updates without removing the receiver from buried airframe compartments.

Technical Specifications

• Brand / Manufacturer: RadioMaster

• Model Identifier: ER16 PWM Dual-Band GEMINI and GEMINI-X Receiver

• Wireless Protocol: ExpressLRS (Requires ExpressLRS v4.1.0 or higher)

• RF Architecture: Dual-Band GEMINI-X (2.4GHz + Sub-G 900MHz)

• Output Channels: 16x PWM Channels

• Serial Protocol Support: CRSF / SBUS

• Input Voltage Range: 5.0V – 12.0V DC

• EXT-V Detection Range: 4.0V – 70.0V DC

• V-PWM Detection Range: Up to 12.0V DC

• XT30-1 Detection Range: Up to 12.0V DC

• XT30-2 Detection Range: Up to 12.0V DC

• Telemetry RF Output Power: Up to 100mW (Adjustable via LUA script)

• Antenna Connector Type: MMCX (Secure, serviceable)

• Antenna Type: 25cm High-Sensitivity Antennas

• Firmware Device Target: RadioMaster Dual 2.4GHz/900MHz Receiver (ER16 Dual Band True Diversity + 16xPWM RX)

• Enclosure: Durable Injection-Molded Plastic Housing

• Dimensions: 61.5 mm × 43.8 mm × 16.8 mm

• Net Weight: 33.0 grams (without antennas)

What Is Included

• (1) RadioMaster ER16 PWM Dual-Band GEMINI-X Receiver

• (2) 2.4GHz High-Sensitivity Antennas (MMCX)

• (2) Dual-Band High-Sensitivity Antennas (MMCX)

• (1) External Voltage Telemetry Cable (EXT-V Type-B)

• (1) CRSF Serial Connection Cable

• (1) ELRS RX to SBUS Connection Cable