RadioMaster ER12 PWM Dual-Band Receiver

Introduction

The RadioMaster ER12 is a cutting-edge ExpressLRS PWM receiver engineered for large-scale fixed-wing models. It addresses the challenges of managing numerous servos and high power demands, providing a stable and reliable control link. Its dual-band GEMINI-X system and reinforced PWM outputs ensure superior signal quality and performance for even the most complex builds.

Key advantages

• ExpressLRS Performance: Delivers low latency, high reliability, and exceptional link quality with flexible configuration options.
• Dual-Band RF Gemini-X (2.4GHz + 900MHz): Utilizes both frequency bands for enhanced link robustness across diverse operating conditions.
• 12 PWM Outputs + Serial Port Support: Offers a full 12-channel PWM output along with a dedicated bidirectional UART for system expansion.
• Dedicated XT30 Power Input: Provides a stable, high-current power source essential for demanding servo systems and larger model setups.
• Reinforced PWM Signal Integrity: Strengthened PWM outputs maintain signal quality over extended servo wires and extensions, improving compatibility with high-torque servos.
• Multi-Source Voltage Telemetry: Simultaneously monitor up to three voltage sources (EXT-V up to 70V, V-PWM up to 12V, XT30 input up to 12V).
• Wi-Fi & WebUI Updates: Conveniently configure settings and update firmware wirelessly without disassembly.
• Robust MMCX Antenna Connectors: Secure, serviceable connections for easy maintenance and long-term reliability.

Technical specifications

• Product: ER12 PWM - GEMINI and GEMINI-X Dual-Band Receiver
• Input Voltage: DC 5.0 - 12.0 V
• Wireless Protocol: ExpressLRS
• Output Channels: 12 PWM Channels
• Serial Output: CRSF / SBUS
• Telemetry Power: Up to 100mW (Adjustable via LUA)
• Voltage Detection Range (EXT-V): DC 4.0 - 70 V
• Bus Interface: CRSF
• Antenna: 25cm, High Sensitivity, MMCX Connector
• Weight: 22.5g (without antenna)
• Dimensions: 51.0x37.6x14.5 mm
• Target Firmware: RadioMaster Dual 2.4GHz/900MHz Receiver
• Device Name: ER12 Dual Band True Diversity + 12xPWM RX
• ELRS FW Version: Requires 4.1.0 or newer

Applications

This receiver is ideal for large fixed-wing aircraft, particularly those equipped with multiple servos or requiring higher current handling. It's suitable for scale models, gliders, and any application demanding a robust and high-channel count PWM control solution.

Compatibility

Compatible with all ExpressLRS transmitters and modules, including those with built-in ELRS. Supports CRSF and SBUS serial protocols. Features a dedicated XT30 power input.

FAQ

What is the RadioMaster ER12 receiver best suited for?

The RadioMaster ER12 is specifically designed for large fixed-wing aircraft that utilize multiple servos and have higher power requirements. Its robust design ensures reliable control for demanding applications.

What makes the GEMINI-X system on the ER12 receiver stand out?

The GEMINI-X system integrates both 2.4GHz and 900MHz Sub-G frequencies. This dual-band operation significantly enhances link reliability and signal penetration, making it ideal for long-range flights and challenging environments.

Can the RadioMaster ER12 monitor multiple power sources?

Yes, the ER12 features independent telemetry inputs for up to three voltage sources. This includes EXT-V (up to 70V), the receiver's supply voltage (V-PWM up to 12V), and the XT30 input voltage (up to 12V), providing comprehensive system monitoring.

How do I update the firmware on the RadioMaster ER12?

Firmware updates and configuration are made easy with the ER12's Wi-Fi and WebUI capabilities. You can perform updates wirelessly without needing to physically access the receiver, ensuring convenience and quick setup.

Where can I buy the RadioMaster ER12 receiver with reliable delivery?

You can buy the RadioMaster ER12 receiver at HTDRONE. We offer fast shipping within Poland and reliable delivery to Ukraine via Nova Poshta. International customers can benefit from worldwide shipping via DHL.