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

Because the FCC is currently preventing new certifications for foreign-made UAS components, we currently cannot import or sell these in the US. If they operated within the amateur bands, we could import them under the current authorization for amateur radio devices. ELRS does not currently support this. We recommend all US customers comment on the ELRS GitHub feature request and also give the request an upvote.
https://github.com/ExpressLRS/ExpressLRS/discussions/3725
Until these are able to be locked on amateur bands, we will be unable to sell them. 

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