Radiomaster ER8 2.4GHz 8CH ExpressLRS ELRS RX 100mW PWM Receiver User Manual

1. Product Overview

The Radiomaster ER8 receiver is a high-performance 2.4GHz 8-channel PWM receiver based on the advanced ExpressLRS system. It is specifically engineered for fixed-wing aircraft, providing reliable control and extensive telemetry capabilities. Its robust design ensures durability in various operating conditions.

Radiomaster ER8 PWM Receiver front view — Front view of the Radiomaster ER8 PWM Receiver, showing channel labels and ExpressLRS branding.

Key Features:

Revolutionary ExpressLRS System: Offers high performance, high reliability, flexible configuration, fast response speed, and ultra-long range.
Designed for Fixed-Wing Users: Capable of driving up to 8 servos, with built-in receiver voltage telemetry and automatic flight battery voltage detection.
Advanced Features: Supports Wi-Fi updates and WEBUI configuration for easy management. Includes a 4-wire CRSF interface for future telemetry sensor expansion.
High Structural Strength: Features a one-piece molded shell for enhanced durability and reliability.
High-Quality Components: Equipped with a high sensitivity 20 cm dual antenna and a 2.54 mm connector, along with necessary telemetry and SBUS wires.

Product Video:

Official product video showcasing the RadioMaster ELRS PWM Receiver ER Series, including ER8, ER4, ER8G, and ER8V models, highlighting their features and applications.

2. Setup and Installation

2.1 Initial Binding

To establish communication between your Radiomaster ER8 receiver and your ExpressLRS compatible transmitter, follow the standard ExpressLRS binding procedure. Typically, this involves powering on the receiver while holding the bind button, or initiating binding via the transmitter's ExpressLRS Lua script.

2.2 Wiring and Connections

The ER8 receiver features 8 PWM output channels for connecting servos and other PWM-controlled devices. It also includes dedicated ports for telemetry and CRSF communication.

Radiomaster ER8 PWM Receiver showing connection ports — Side view of the ER8 receiver, illustrating the PWM output pins (CH1-CH8, BATT) and the HV/BOOT button.

Radiomaster ER8 PWM Receiver showing EXT-V and RX TX ports — Another view of the ER8 receiver, highlighting the EXT-V port for external battery voltage input and the RX TX port for CRSF communication.

Detailed view of ER8 receiver connections and design features — Detailed illustration of the 4-pin CRSF input for future optional telemetry sensors, high sensitivity antenna, and high-quality 2.54mm connector with 2µm gold plating for strong corrosion resistance.

Connect your servos to the corresponding PWM channels (CH1-CH8). The BATT pin provides receiver voltage telemetry. For external battery voltage monitoring, connect your flight battery to the EXT-V port. The RX TX port is used for CRSF communication, allowing for advanced telemetry and configuration options.

Radiomaster ER8 PWM Receiver with 200mm antenna length indicated — The ER8 receiver features a 200mm high-sensitivity dual antenna for optimal signal reception.

3. Operation

3.1 Telemetry Functionality

The ER8 receiver supports both built-in receiver voltage telemetry and external flight battery voltage telemetry. This allows you to monitor critical power information directly from your transmitter, enhancing flight safety and awareness.

Diagram showing voltage telemetry and WiFi update features — Illustration of the ER8's support for 8 PWM channels, automatic voltage telemetry (built-in receiver voltage and external battery voltage input), and Wi-Fi updates with WEBUI configuration.

3.2 Firmware Updates and Configuration

The ER8 receiver supports convenient Wi-Fi updates and WEBUI configuration. This allows users to easily update the firmware to the latest version and configure receiver settings through a web interface, ensuring optimal performance and compatibility with new features.

4. Maintenance

To ensure the longevity and reliable operation of your Radiomaster ER8 receiver, consider the following maintenance tips:

Physical Inspection: Regularly inspect the receiver for any signs of physical damage, such as cracks in the casing, bent pins, or frayed antenna wires.
Cleanliness: Keep the receiver free from dust, dirt, and moisture. Use a soft, dry cloth for cleaning. Avoid using solvents or harsh chemicals.
Antenna Placement: Ensure antennas are mounted correctly and are not kinked or damaged. Proper antenna orientation is crucial for signal integrity.
Storage: When not in use, store the receiver in a dry, cool environment, away from direct sunlight and extreme temperatures.

5. Troubleshooting

If you encounter issues with your Radiomaster ER8 receiver, refer to the following common troubleshooting steps:

No Signal/Loss of Control:
- Verify that the receiver is correctly bound to your transmitter.
- Check antenna connections and ensure they are not damaged or obstructed.
- Confirm that the transmitter and receiver are operating on the same ExpressLRS firmware version.
- Ensure adequate power supply to the receiver.
Binding Failure:
- Ensure the receiver is in bind mode (LED flashing rapidly).
- Confirm the transmitter is in bind mode and transmitting.
- Try moving the transmitter closer to the receiver during the binding process.
- Check for firmware mismatches between the transmitter and receiver.
Incorrect Telemetry Readings:
- Verify that all telemetry wires (especially EXT-V) are correctly connected.
- Ensure your transmitter is configured to display the correct telemetry sensors.
- Check for any physical damage to the telemetry ports or wires.
Intermittent Connection:
- Check for sources of interference in your operating environment.
- Ensure antennas are positioned optimally and away from carbon fiber or metal parts.
- Consider updating to the latest firmware for potential stability improvements.

6. Technical Specifications

Specification	Value
Product Dimensions	1.85 x 1.3 x 0.58 inches (47 x 33 x 14.7 mm)
ASIN	B0D49FS5N1
Manufacturer Recommended Age	15 years and up
Manufacturer	Xiangtat
Channels	8 PWM Channels
Telemetry Power	Up to 100mW
Antenna Length	200mm (dual antenna)
Voltage Input	DC 4.5-8.4V

Radiomaster ER8 PWM Receiver with dimensions indicated — Physical dimensions of the ER8 receiver: 43mm length, 30mm width, 15mm height.

Radiomaster ER8 PWM Receiver on a scale showing 16.50 grams — The ER8 receiver weighs approximately 16.50 grams.

7. Warranty and Support

This product is covered by the manufacturer's standard warranty. For specific warranty terms, technical support, or service inquiries, please refer to the official Xiangtat website or contact their customer service directly. Keep your proof of purchase for warranty claims.

For additional resources and community support related to ExpressLRS, visit the official ExpressLRS project website or relevant RC hobby forums.

	RadioMaster ER8 ELRS Receiver User Manual and Setup Guide Comprehensive guide for the RadioMaster ER8 ELRS receiver, covering setup, binding, telemetry, and product features for fixed-wing aircraft.
	Radiomaster ER8 ELRS Receiver: Features, Setup, and Binding Guide Comprehensive guide to the Radiomaster ER8 ELRS receiver, covering its features, important settings, traditional and passphrase binding methods, telemetry, and FCC compliance. Designed for fixed-wing aircraft.
	Radiomaster ER8 ExpressLRS Receiver User Manual Comprehensive user manual for the Radiomaster ER8 ExpressLRS 2.4GHz PWM receiver. Learn about its features, specifications, setup, and binding procedures for optimal performance in your RC aircraft.
	RadioMaster ERS-GPS Telemetry Sensor User Manual User manual for the RadioMaster ERS-GPS Telemetry Sensor, detailing specifications, setup, features, and operation for ExpressLRS PWM receivers.
	RadioMaster ER8 Receiver User Manual User manual for the RadioMaster ER8 2.4GHz ELRS PWM Receiver, detailing specifications, setup, firmware, and binding procedures for RC aircraft.
	RadioMaster ERS-GPS Telemetry Sensor User Manual User manual for the RadioMaster ERS-GPS Telemetry Sensor, detailing its specifications, setup, features, and modes for use with ER series ExpressLRS PWM receivers.

Xiangtat ER8