RadioMaster DBR4 Dual Band Xross Gemini ELRS Receiver 2.4G/900MHz for FPV Drones

Introduction

The RadioMaster DBR4 Dual Band Xross Gemini ELRS Receiver represents a significant leap forward in FPV drone control technology. Designed as the perfect companion for the RadioMaster Nomad radio transmitter, the DBR4 is a cutting-edge dual-band, dual-receiver system. It ensures seamless compatibility and exceptional performance for serious FPV pilots who demand the utmost reliability in their control link.

Key Advantages

• Experience superior signal integrity with dual-band ELRS Gemini Xrossband technology.
• Simultaneously receive 2.4GHz and 900MHz signals for unparalleled interference resistance.
• Eliminate packet loss and enjoy a rock-solid, reliable connection for confident flying.
• Features four separate antennas for optimal placement and maximum signal reception.
• Compact 20x20mm mounting pattern fits most FPV frames.
• Supports Xrossband GemX for advanced connectivity.
• High telemetry radio power up to 2x 100mW for extended range.
• Fast receiver refresh rates ensure precise control inputs.

Technical Specifications

• Product: DBR4 Gemini Xrossband ExpressLRS Receiver
• Type: ISM_2.4, FCC_915
• MCU: ESP32
• RF Chip: Semtech LR1121 x 2
• Telemetry RF Power: Max 100mW
• Antenna: 2 x 2.4GHz wired antennas & 2 x 900MHz wired antennas
• Frequency Range: 2.404 - 2.479 GHz / 903.5 - 926.9 MHz
• Max Receiver Refresh Rate: 500Hz (1000Hz expected with ExpressLRS V3.4)
• Min Receiver Refresh Rate: 50Hz
• Operating Voltage: DC 4.5 - 8.4V
• Weight: 2.70g (without antennas) / 5.30g (with antennas)
• Dimensions: 27.20mm x 27.20mm
• Firmware Version: ExpressLRS v3.3.2 pre-installed
• Bus Interface: CRSF

Applications

This receiver is ideal for a wide range of FPV applications, including freestyle, racing, long-range exploration, cinematic FPV, and professional UAV operations where a stable and robust control link is paramount. Its dual-band capability makes it exceptionally suited for environments with high RF noise.

Compatibility

The DBR4 is designed for seamless integration with the RadioMaster Nomad transmitter. It utilizes the CRSF bus interface for communication. The receiver features a standard 20x20mm mounting pattern, ensuring compatibility with most FPV flight controller stacks. It operates within a DC 4.5 - 8.4V range.

FAQ

What makes the RadioMaster DBR4 receiver unique for FPV drones?

The RadioMaster DBR4 stands out with its dual-band, dual-receiver Gemini technology, capable of simultaneously processing both 2.4GHz and 900MHz signals. This provides exceptional interference resistance and minimizes the risk of lost control packets, ensuring a highly reliable connection for your FPV drone.

What is the range and reliability of the RadioMaster DBR4 receiver?

The DBR4 offers robust reliability through its dual-band operation, reducing signal loss in noisy environments. While specific range depends on many factors, the dual 100mW telemetry power and advanced ELRS firmware contribute to a strong, dependable control link suitable for various FPV applications.

What are the key technical specifications of the RadioMaster DBR4?

Key specs include dual ESP32 MCUs, Semtech LR1121 RF chips, 2x 2.4GHz and 2x 900MHz antennas, a 20x20mm mounting pattern, CRSF interface, and operating voltage of DC 4.5-8.4V. It supports ExpressLRS v3.3.2 and offers high refresh rates.

Where can I buy the RadioMaster DBR4 receiver with fast delivery?

You can buy the RadioMaster DBR4 Dual Band Xross Gemini ELRS Receiver at HTDRONE. We offer fast shipping within Poland and reliable delivery to Ukraine via Nova Poshta. Check our store for the best deals on FPV components.

Is the RadioMaster DBR4 compatible with older FPV systems?

The DBR4 is optimized for ExpressLRS (ELRS) systems, particularly noted for its compatibility with the RadioMaster Nomad transmitter. It uses the CRSF bus interface, which is standard for many modern FPV flight controllers and radios. Ensure your radio transmitter supports ELRS and CRSF for best results.