[Pre-order] ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver
- VAT will be applied to orders shipped to the EU.
- Batteries can't be shipped separately, please purchase batteries with Radio units.
- Customized products require a 40-day lead time and no refunds can be made after the order is placed.
The ER12 is designed for larger fixed-wing aircraft that require a higher channel count and robust power handling without unnecessary complexity. Its full-size layout and straightforward integration make it well suited to multi-servo, higher-current installations.
Note on FCC Certification:
Due to current FCC regulations classifying this product as a foreign-produced UAS component, we are currently unable to obtain FCC certification. This item cannot be shipped to or sold in the United States at this time.
Please note this is the pre-order; Orders start shipping at the end of September.
Features
- ExpressLRS Performance: Low latency, high reliability, and excellent link quality with flexible configuration options.
- Dual-Band Gemini-X RF System (2.4GHz + Sub-G 900MHz): Utilizes both frequency bands to provide enhanced link reliability across a wide range of operating environments.
- 12 PWM Outputs + Serial Support: Full 12-channel PWM output with dedicated bidirectional UART and serial interfaces for system integration and expansion.
- XT30 Dedicated Power Input: Provides stable, high-current power delivery for demanding servo systems and larger aircraft installations.
- PWM Signal Amplification: Amplified PWM outputs help maintain signal quality over long servo leads and extension cables. They also improve compatibility with larger, high-torque servos, helping ensure reliable control signal delivery throughout the aircraft.
- Independent Multi-Source Voltage Telemetry: Monitor up to three power sources simultaneously using dedicated ADC channels: EXT-V (up to 70V), receiver supply voltage (V-PWM) (up to 12V), and XT30 input voltage (up to 12V).
- External UART Port: Dedicated interface for telemetry, external devices, and system expansion.
- Wi-Fi Updates & WebUI: Configure settings and perform firmware updates wirelessly without disassembly.
- Robust MMCX Antenna Connectors: Secure, serviceable antenna connections for easy maintenance and long-term reliability.
- Durable Injection-Molded Housing: Provides consistent protection and structural durability for demanding installations.
- Application: Designed as a PWM receiver for large fixed-wing aircraft, especially where multiple servos and higher current loads are involved.
- Compatibility: Compatible with all ExpressLRS transmitters and modules, including radios with built-in ELRS.
Built on the ExpressLRS platform and equipped with dual Semtech LR1121 transceivers, the ER12 utilizes a dual-band Gemini X RF architecture operating on both 2.4 GHz and Sub-G 900 MHz. The result is a stable, consistent control link across a wide range of operating environments, with an architecture that prioritizes dependable operation.
The ER12 uses amplified PWM outputs to help maintain reliable servo signals over long leads and extension cables commonly used in larger aircraft. The amplified outputs also help ensure clean and consistent signals when operating larger, high-torque servos that place greater demands on the control system. The receiver also features three independent voltage telemetry channels with dedicated ADCs, allowing simultaneous monitoring of the receiver supply voltage (V-PWM) (up to 12V), the XT30 power input (up to 12V), and an EXT-V input for monitoring external battery voltages up to 70V. Serial connectivity is available via a dedicated 4-pin JST-GH locking UART/CRSF port for telemetry devices and other serial peripherals.
From installation to operation, the ER12 focuses on practicality, with a clean PCB layout to reduce interference, MMCX antenna connectors for easy serviceability, and a durable injection-molded housing built for long-term use.
⚠️ XT30 Power Input Notice
XT30 Power Input:
The XT30 provides direct battery voltage to the receiver and PWM power rail. Output voltage matches the input voltage. Use only servos rated for the applied voltage. High-voltage systems (2S LiPo/Li-ion) require HV-rated servos. Standard 5V servos must be powered through a regulated 5V supply or the standard servo power input pins.
When using the XT30 to power the receiver and servos, the ESC’s 5V/BEC wire must be disconnected to prevent back-feeding and possible damage.
EXT-V Power Input:
The EXT-V input is accessed through the 2-pin JST-GH connector. Connect the red wire to the positive (+) terminal of the battery or ESC. The ER12 provides independent ADC channels for monitoring V-EXT and V-XT30, allowing it to accurately detect and report the appropriate input voltage for your installation.
Designed for large-scale systems using multiple servos and long wiring runs.
Specification
- Item: ER12 PWM - Dual-Band GEMINI and GEMINI-X Receiver
- Input Voltage: DC 5.0 – 12.0V
- Wireless Protocol: ExpressLRS
- Output Channels: 12CH PWM
- Serial Output: CRSF / SBUS
- Telemetry Power: Up to 100mW (adjustable via LUA)
- Voltage Detection Range (EXT-V): DC 4.0 – 70V
- Bus Interface: CRSF
- Antenna: 25 cm high-sensitivity, MMCX connector
- Weight: 22.5 g (without antenna)
- Dimensions: 51.0 × 37.6 × 14.5 mm
- Firmware Target: RadioMaster Dual 2.4GHz/900MHz Receiver
- Device Name: ER12 Dual Band True Diversity + 12×PWM RX
- ELRS FW Version: Requires version 4.1.0 or Higher
Size
Associated Products
- ER16 Dual-Band GEMINI Receiver
- ER3PRO Dual-Band GEMINI Receiver
- TX16S MK3 Radios
- TX15 Radios
- Nomad External ExpressLRS Module
Package Includes
- 1 * ER12 PWM - Dual-Band GEMINI and 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
