Radiomaster 2.4GHz ELRS PWM Receiver User Manual

1. Introduction

The Radiomaster ER Series are all-new, ground-up designed PWM receivers utilizing the ExpressLRS 2.4GHz protocol. These receivers are engineered for high performance, reliability, and fast response speed, suitable for various RC applications including fixed-wing aircraft, cars, and boats. This manual provides essential information for setting up, operating, and maintaining your ER series receiver.

2. Setup

2.1. Binding Process

Radiomaster ER series receivers come pre-installed with ExpressLRS 3.2 firmware. To bind your receiver to your ExpressLRS transmitter module:

1. Power on your receiver. The LED will typically flash slowly.
2. Power cycle the receiver three times rapidly. The LED should now flash quickly, indicating it is in binding mode.
3. On your ExpressLRS transmitter module, initiate the binding process (usually via the ELRS LUA script).
4. Once bound, the receiver's LED will turn solid, indicating a successful connection.

2.2. Wiring and Connections

Ensure correct polarity when connecting power and servos. Refer to the specific model diagrams for channel assignments.

ER4 Connections

• Power Supply: DC 4.5 - 8.4V via any PWM channel or dedicated power input.
• PWM Channels: 4 channels for servo output.
• Antenna: Integrated 15cm high sensitivity antenna.

ER6/ER6G/ER6GV Connections

• Power Supply: DC 4.5 - 8.4V (ER6) or DC 3.5 - 8.4V (ER6G/ER6GV).
• PWM Channels: 6 channels for servo output.
• Antenna: ER6 uses 20cm high sensitivity dual antenna. ER6G/ER6GV use 15cm high sensitivity antenna.
• CRSF Input: 4-pin CRSF input for future optional telemetry sensors (ER6 only).
• EXT-V: External voltage telemetry input.

ER8/ER8G/ER8GV Connections

• Power Supply: DC 4.5 - 8.4V (ER8) or DC 3.5 - 8.4V (ER8G/ER8GV).
• PWM Channels: 8 channels for servo output.
• Antenna: 20cm high sensitivity antenna.
• CRSF Input: 4-pin CRSF input for future optional telemetry sensors (ER8 only).
• EXT-V: External voltage telemetry input.

2.3. Firmware Updates and Configuration

All ER series receivers support WiFi updates and WebUI configuration, allowing for easy firmware upgrades and parameter adjustments.

2.4. Voltage Telemetry Setup

The receivers support voltage telemetry with automatic detection for both built-in receiver voltage and external battery voltage input.

• Built-in Receiver Voltage: Automatically detected and transmitted.
• External Battery Voltage: Connect the provided voltage telemetry wire (Type-A or Type-B depending on model) to the EXT-V port and to the battery you wish to monitor. Ensure correct polarity.

3. Operating

3.1. General Operation

Once bound, the receiver will output PWM signals to your servos based on the commands received from your ExpressLRS transmitter. Ensure your transmitter is configured correctly for the number of channels your receiver supports.

3.2. Telemetry Usage

Telemetry data, including receiver voltage, external battery voltage, and RSSI/LQ, is transmitted back to your transmitter. This data can be displayed on your transmitter screen or logged for analysis.

3.3. Vario Sensor (ER6GV, ER8GV)

Models with 'GV' in their name (ER6GV, ER8GV) include a built-in high-precision air pressure sensor (Vario). This sensor provides altitude and vertical speed information, which is transmitted via telemetry to your transmitter, useful for thermal hunting and glider applications.

4. Maintenance

• Antenna Care: Ensure antennas are not kinked or cut. For dual antenna models, position them at a 90-degree angle to each other for optimal signal reception. The thick antenna silicone rubber on ER6/ER8 models provides durability.
• Environmental Protection: Keep the receiver away from excessive moisture, dust, and extreme temperatures.
• Physical Inspection: Periodically check for any loose connections or physical damage.

5. Troubleshooting

• No Bind: Ensure the receiver is in binding mode (rapid LED flash) and your transmitter is also in bind mode. Check that both receiver and transmitter are running compatible ExpressLRS firmware versions.
• No Signal/Lost Connection: Check antenna connections and placement. Ensure the transmitter is powered on and within range. Verify power supply to the receiver.
• Telemetry Not Working: Check wiring for external voltage telemetry. Ensure telemetry is enabled in your transmitter's ELRS LUA script.
• Intermittent Control: Check for sources of interference near the receiver or transmitter. Ensure power supply is stable and sufficient for both receiver and servos.

6. Specifications

6.1. ER4 Specifications

6.2. ER6 Specifications

6.3. ER6G Specifications

6.4. ER6GV Specifications

6.5. ER8 Specifications

6.6. ER8G Specifications

6.7. ER8GV Specifications

7. User Tips

Based on available user feedback, these receivers are noted for their good quality. No specific operational tips were highlighted in the provided reviews or Q&A.

8. Warranty and Support

For warranty claims, technical support, or service inquiries, please contact your original point of purchase or the official Radiomaster support channels. Keep your proof of purchase for any warranty-related requests.