GEPRC ELRS Nano DUAL 2.4G True Diversity Receiver Instruction Manual

1. Introduction

The GEPRC ELRS Nano DUAL 2.4G True Diversity Receiver is a cutting-edge receiver designed for FPV quadcopters and long-range drones. Built upon the open-source ExpressLRS project, it offers exceptional performance with long-range capabilities, ultra-low latency, and a high refresh rate of up to 1000Hz. Its true dual-antenna diversity system ensures a stable and reliable connection, while the integrated ESP32-C3 chip with Wi-Fi functionality simplifies firmware updates. The receiver's compact size and lightweight design make it ideal for various drone applications.

2. Features

• Compact size, weighing only 1.1g (RX only).
• Built-in Wi-Fi for convenient firmware upgrades.
• Based on the ExpressLRS open-source project for advanced remote control.
• Supports a maximum refresh rate of 1000Hz.
• True diversity receiver with two independent RF receiving links for enhanced signal stability.
• Utilizes a Temperature Compensated Crystal Oscillator (TCXO) for stable performance across varying temperatures.
• Equipped with high-performance SX1281 and ESP32-C3 chips.

3. Specifications

Detailed specifications for the GEPRC ELRS Nano DUAL 2.4G True Diversity Receiver.

4. Package Contents

Visual representation of the items included in the product package.

• 1 x ELRS Nano DUAL 2.4G True Diversity Receiver
• 2 x 2.4G T-Antennas (ipex1 80mm)
• 1 x Receiver silicone cable (SH1.0 4pin 100mm)
• 1 x Heat shrink tube
• 1 x User manual (this document)

5. Setup

5.1. Wiring Diagram

Refer to the wiring diagrams below for connecting the receiver to your Flight Controller (FC). Ensure correct polarity to prevent damage.

Wiring instructions for connecting the receiver to a standard Flight Controller and a Betaflight standard connector. Note the pin assignments for GND, 5V, TX, and RX.

5.2. Antenna Installation

Connect the two provided 2.4G T-Antennas to the ipex1 connectors labeled ANT1 and ANT2 on the receiver module. Ensure the antennas are securely attached and positioned for optimal signal reception. For true diversity, ensure antennas are oriented differently (e.g., 90 degrees apart) to maximize coverage.

The receiver module with both T-antennas connected, illustrating the dual antenna setup.

5.3. Firmware Update (Wi-Fi)

The receiver features a built-in ESP32-C3 chip with Wi-Fi for convenient firmware updates. To update the firmware:

1. Power on the receiver.
2. Connect to the receiver's Wi-Fi hotspot using a computer or mobile device.
3. Access the ExpressLRS web interface (usually via a web browser at a specific IP address, refer to ExpressLRS documentation for details).
4. Upload the desired firmware file.

Detailed view highlighting the RGB status light, SH1.0 connector, ESP32-C3 chip, and Wi-Fi capability for firmware updates.

6. Operation

6.1. Binding

The GEPRC ELRS Nano DUAL 2.4G True Diversity Receiver operates on the ExpressLRS protocol. Refer to the official ExpressLRS documentation for detailed binding procedures, as these can vary slightly depending on your ExpressLRS module and firmware version. Generally, binding involves putting both the receiver and your transmitter's ELRS module into bind mode simultaneously.

6.2. Indicator Light Status

The receiver is equipped with an RGB indicator light to display its status. Consult the ExpressLRS documentation for specific light patterns and their meanings (e.g., solid, blinking, color changes) which typically indicate power, binding status, and signal reception.

7. Maintenance

• Keep the receiver clean and free from dust and debris.
• Ensure antenna connections are secure before each flight.
• Regularly check for and update to the latest ExpressLRS firmware for optimal performance and new features.
• Avoid exposing the receiver to extreme moisture or physical impact.
• If using heat shrink tubing, ensure it does not excessively compress or overheat the module.

8. Troubleshooting

• No Power/No Indicator Light:
  • Check the 5V input voltage and wiring connections (GND, 5V).
  • Ensure the Flight Controller is powered on correctly.
• No Signal/Binding Issues:
  • Verify that both the receiver and transmitter ELRS module are running compatible firmware versions.
  • Ensure the binding procedure is followed correctly as per ExpressLRS documentation.
  • Check antenna connections; loose antennas can lead to poor signal.
  • Ensure the transmitter and receiver are within range and not obstructed by metal objects.
• Intermittent Signal Loss:
  • Check antenna placement and orientation; ensure they are not shielded by carbon fiber or other components.
  • Inspect antennas for damage.
  • Ensure no strong interference sources are nearby.
• Receiver Damage:
  • If the receiver is not functioning after checking power and connections, inspect for physical damage or reversed polarity wiring (as warned in the wiring diagram).

9. User Tips

• Antenna Placement: For true diversity, try to mount the two T-antennas at a 90-degree angle to each other to maximize signal reception from different orientations during flight.
• Heat Shrink Tubing: Use the provided heat shrink tube to protect the receiver from environmental elements and short circuits, but ensure it doesn't trap excessive heat.
• Firmware Management: Keep track of your ExpressLRS firmware versions on both your receiver and transmitter to ensure compatibility. The Wi-Fi update feature makes this very convenient.
• Wiring Verification: Always double-check your wiring against the provided diagrams, especially the TX/RX connections, to prevent damage.

10. Warranty & Support

For warranty claims, technical support, or further assistance, please contact GEPRC Official Store directly through your purchase platform or their official website. Keep your proof of purchase for any warranty-related inquiries.