RadioMaster ER12 PWM – Dual-Band GEMINI-X ELRS Receiver

12-Channel PWM Power, Dual-Band RF Performance and Advanced Telemetry — selected by Aerobertics for demanding RC applications.

The RadioMaster ER12 PWM is a high-performance Dual-Band GEMINI-X ExpressLRS receiver designed for larger and more demanding RC aircraft. Combining 2.4GHz + Sub-G 900MHz dual-band technology, true diversity reception, 12 amplified PWM outputs, multiple serial interfaces, and advanced multi-source voltage telemetry, the ER12 delivers a powerful and versatile control solution for sophisticated installations.

With a dedicated XT30 power input, the ER12 is particularly well suited to models using multiple or high-current servos. Its amplified PWM outputs help maintain reliable signal quality over long servo leads and extension cables, providing dependable control signal delivery throughout the aircraft.

Key Features

• Dual-Band GEMINI-X RF System
  Combines 2.4GHz and Sub-G 900MHz technology for enhanced RF performance, link reliability, and robust control in demanding RC applications.
• 12 PWM Outputs + Serial Support
  Provides full 12-channel PWM output for direct servo connection, together with dedicated bidirectional UART and serial interfaces for system integration and expansion.
• Dedicated XT30 Power Input
  The dedicated XT30 connector provides stable, high-current power delivery for demanding servo systems and larger aircraft installations.
• Amplified PWM Signal Outputs
  Amplified PWM signals help preserve signal integrity over long servo leads and extension cables. They also improve compatibility with larger, high-torque servos, helping ensure reliable signal delivery throughout the aircraft.
• Independent Multi-Source Voltage Telemetry
  Monitor up to three power sources simultaneously through dedicated ADC channels:
  • EXT-V: up to 70V
  • V-PWM / Receiver Supply: up to 12V
  • XT30 Input Voltage: up to 12V
• External UART Interface
  A dedicated external UART port provides convenient connectivity for telemetry, external devices, and future system expansion.
• CRSF & SBUS Support
  Flexible serial connectivity makes the ER12 suitable for a wide range of advanced RC installations.
• Adjustable Telemetry Power
  Telemetry power can be configured up to 100mW via the ExpressLRS LUA interface.
• Wi-Fi Updates & WebUI
  Configure the receiver and perform firmware updates wirelessly, without removing it from the aircraft or opening the installation.
• Robust MMCX Antenna Connectors
  Secure and serviceable MMCX connections allow easy antenna replacement while providing long-term reliability.
• Durable Injection-Molded Housing
  The robust enclosure provides consistent protection and structural durability for demanding RC installations.
• ExpressLRS Compatible
  Compatible with ExpressLRS transmitters and modules, including radios featuring built-in ExpressLRS.

Technical Specifications

Ideal for Larger & Demanding RC Models

The ER12 PWM is an excellent choice for large-scale aircraft, aerobatic models, sport aircraft, gliders, and other RC models equipped with multiple servos or high-current servo systems.

Its combination of 12 PWM channels, amplified signal outputs, dedicated XT30 power input, dual-band RF technology, and comprehensive voltage telemetry makes it particularly well suited to installations where reliability, power management, and connectivity are critical.

Package Contents

• 1 × ER12 PWM – Dual-Band GEMINI / GEMINI-X Receiver
• 2 × 2.4GHz Antennas
• 2 × Dual-Band Antennas
• 1 × Voltage Telemetry Cable (Type-B)
• 1 × ELRS RX SBUS Cable
• 1 × CRSF Cable

The Aerobertics Touch

At Aerobertics, we focus on equipment that brings genuine value to serious RC pilots. The ER12 combines the RF performance of Dual-Band GEMINI-X with the practical benefits of 12 PWM channels, amplified servo signals, dedicated high-current power input, and comprehensive telemetry — making it a smart choice for demanding aircraft where reliability matters.