Product overview
The RadioMaster ER16 PWM - Dual-Band GEMINI and GEMINI-X Receiver provides radio control and onboard system connections for large fixed-wing aircraft. Its ExpressLRS architecture combines two Semtech LR1121 transceivers with simultaneous 2.4 GHz and Sub-G 900 MHz operation. Sixteen PWM outputs accommodate higher channel counts, while CRSF and SBUS serial outputs provide additional integration options. The firmware requirement is ExpressLRS 4.1.0 or higher. Radio integration supports ExpressLRS transmitters and modules, including radios with built-in ELRS.
The injection-molded receiver measures 61.5 × 43.8 × 16.8 mm and weighs 33.0 g without antennas. Top-mounted servo outputs provide accessible wiring connections, and amplified PWM signals support long servo leads and extension cables. A locking 4-pin JST-GH UART/CRSF port connects flight controllers, stabilizers, telemetry sensors and other UART peripherals. MMCX antenna connectors provide serviceable antenna attachments, while Wi-Fi and WebUI access allow configuration and updates without opening the housing. The supplied receiver package includes two 2.4GHz antennas, two dual-band antennas, a safety switch module, and voltage telemetry, SBUS and CRSF cables.
Two isolated XT30 inputs accept independent redundant supplies, with continued operation from the remaining source if one fails. Four dedicated ADC channels monitor EXT-V up to 70V and V-PWM, XT30-1 and XT30-2 up to 12V each. The XT30 inputs feed battery voltage directly to the receiver and PWM rail, so servo voltage ratings must match: 2S LiPo/Li-ion installations require HV-rated servos, while standard 5V servos require a regulated 5V supply or the standard servo power input pins. When XT30 powers the receiver and servos, disconnect the ESC’s 5V/BEC wire to prevent back-feeding and damage.
Specifications
| Specification | Value & conditions |
|---|---|
| Product | RadioMaster ER16 PWM - Dual-Band GEMINI and GEMINI-X Receiver |
| Application | PWM receiver for large fixed-wing aircraft requiring redundancy and higher channel counts. |
| RF architecture | Dual Semtech LR1121 transceivers with dual-band Gemini X operation on 2.4 GHz and Sub-G 900 MHz. |
| Input voltage | DC 5.0 – 12.0V |
| Wireless protocol | ExpressLRS |
| PWM outputs and serial integration | 16CH PWM with dedicated bidirectional UART and serial interfaces. |
| Serial output | CRSF / SBUS |
| Bus interface | CRSF |
| Telemetry power | Up to 100mW (adjustable via LUA)Adjustable via LUA. |
| External voltage detection range | DC 4.0 – 70VEXT-V input. |
| Antenna | 25 cm high-sensitivity, MMCX connector |
| Weight | 33.0 g (without antenna)Without antenna. |
| Dimensions | 61.5 × 43.8 × 16.8 mm |
| Firmware target | RadioMaster Dual 2.4GHz/900MHz Receiver |
| Device name | ER16 Dual Band True Diversity + 16×PWM RX |
| ELRS firmware requirement | Requires version 4.1.0 or Higher |
| Redundant power | Two isolated XT30 inputs support independent redundant supplies and separate battery telemetry; operation continues from the remaining supply if one source fails.Two independent power sources connected to the isolated XT30 inputs. |
| Independent voltage telemetry | Up to four sources simultaneously: EXT-V up to 70V; V-PWM, XT30-1 and XT30-2 each up to 12V.Dedicated ADC channels for EXT-V, V-PWM, XT30-1 and XT30-2. |
| UART connector | Dedicated 4-pin JST-GH locking UART/CRSF port for flight controllers, stabilizers, telemetry sensors and other UART peripherals. |
| Safety interface | SW port supports pull-tab or external safety modules to keep the system inactive until intentional power-up. |
| Servo connection layout | Top-mounted PWM connections. |
| PWM signal amplification | Amplified PWM outputs help maintain signal quality over long wiring runs and improve compatibility with larger, high-torque servos.Long servo leads and extension cables; larger, high-torque servos. |
| Housing | Injection-molded housing. |
| Configuration and updates | Wi-Fi updates and WebUI configuration without disassembly. |
| Radio compatibility | ExpressLRS transmitter and module compatibility, including radios with built-in ELRS.ExpressLRS transmitters and modules, including radios with built-in ELRS. |
| PWM rail voltage and servo requirements | XT30 input voltage feeds the receiver and PWM rail directly. Servos must match the applied voltage; 2S LiPo/Li-ion systems require HV-rated servos. Standard 5V servos require a regulated 5V supply or the standard servo power input pins.XT30 power inputs in use. |
| ESC BEC wiring requirement | Disconnect the ESC’s 5V/BEC wire to prevent back-feeding and possible damage.XT30 inputs powering the receiver and servos. |
| EXT-V connection | 2-pin JST-GH connector; red wire connects to the battery or ESC positive (+) terminal.External battery or ESC voltage monitoring. |
| Supplied configuration | 1 ER16 receiver; 2 2.4GHz antennas; 2 dual-band antennas; 1 safety switch module; 1 Type-B voltage telemetry cable; 1 ELRS RX SBUS cable; 1 CRSF cable.Included equipment. |
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