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RadioMaster DBR4 Dual Band ExpressLRS Receiver Xross Gemini 

Introducing the RadioMaster DBR4 Dual Band ExpressLRS Receiver Xross Gemini—the ultimate companion for the RadioMaster Nomad module. Designed with cutting-edge dual-band, dual-channel Gemini technology, the DBR4 receiver simultaneously processes 2.4GHz and 900MHz signals, offering superior interference rejection and ensuring seamless, reliable communication. By receiving two data streams at once, this receiver minimizes the risk of lost packets, providing a robust and reliable signal that empowers you to explore new horizons with confidence. Elevate your RC experience with the unmatched performance and connectivity of the DBR4 Receiver.

Features

• Telemetry RF power: Max 2x 100mw
• Experience unmatched reliability with dual-band ELRS Gemini Xrossband
• ExpressLRS Gemini 2.4GHz
• ExpressLRS Gemini 868/900MHz
• 4 Descrete antennas for optimal antenna arrangement
• 20 X 20mm mounting holes
• Xrossband GemX support

Specification

• Item: 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 wires & 2 x 900MHz wires
• Frequency Range: 2.404 - 2.479 GHz / 903.5 - 926.9 MHz
• Maximum receive refresh rate: 500Hz (1000Hz coming soon in ExpressLRS V3.4)
• Minimum receiver refresh rate: 50Hz
• Working voltage: DC 4.5 - 8.4V
• Weight: Without antennas 2.70g / With antennas 5.30g
• Dimension: 27.20 *27.20mm
• Firmware Version: ExpressLRS v3.3.2 pre-installed
• Bus interface: CRSF

New Packet Rates

Sub-GHz 250Hz (-111dBm)

• Speed Boost: Achieve faster packet rates with enhanced sub-GHz performance.

Sub-GHz 200Hz Full (-111dBm)

• Optimized for Mavlink: Double the packet data of current 900 SX1276 hardware, catering specifically to Mavlink users for a more robust link and reduced interference.

Dual Band X150Hz (-112dBm)

• Gemini Mode: Experience simultaneous sub-GHz and 2.4GHz transmissions, providing robust performance and reduced interference with a packet rate of 150Hz.

Dual Band X100Hz Full (-112dBm)

• Enhanced Gemini Mode: Achieve the same dual-frequency transmission benefits at a 100Hz packet rate with full 16 channel resolution, ensuring strong and stable connectivity even in challenging environments.

Introduction of K Modes

DK500 (Coming in ExpressLRS V3.5)

• Design specifically from the ground up for lovers of speed and RC reliability.  K modes are next generation FSK modulation with built in packet repair (Forward Error Correction).  Just like FLRC D500, DK500 sends repeat packets to reduce packet loss in challenging race event environments. Coupled with a Gemini enabled Tx and Rx, nothing comes close to RC reliability.

K1000 Full SubGHs (Coming in ExpressLRS V3.5)

• Yes, you read that right, 1000Hz in the 868/900MHz Domain! While this mode has been designed for maximum data throughput when used with MAVLink, don't be fooled by the 1000Hz, during development it was tested it at long range.

Weight

Size

Package Includes

• 1 * DBR4 Gemini Xrossband ExpressLRS Receiver
• 2 * 2.4 GHz wire antennas
• 2 * 900 MHz wire antennas
• 1 * CRSF wire
• 4 * 4mm Red vibration dampeners
• 4 * 3mm Black vibration dampeners
• 1 * Manual card