Radiomaster DBR4 Dual Band Xross Gemini ExpressLRS Receiver

The new Radiomaster DBR4 ELRS Receiver—pairs perfectly with the RadioMaster Nomad. This dual-band, dual-channel Gemini receiver ensures seamless compatibility with the Nomad module.  Simultaneously receive 2.4GHz and 900MHz signals, the DBR4 offers exceptional interference rejection and reliable signal integrity. Radiomaster brings unmatched reliability with the Xrossband ELRS.

Click here for the Nomad Dual 1W Gemini Xrossband ExpressLRS Module!

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Features

• Supports ExpressLRS Gemini 868/900MHz
• Supports ExpressLRS Gemini 2.4GHz
• 2x 100mw Telemetry RF Power
• Gemini Xrossband Technology
• Advanced Cooling System
• 20x20 Mounting Holes
• 4 Discrete Antennas
• Compatibility

INTRODUCTION OF K MODES
K1000 Full SubGHz (Coming in ExpressLRS V3.5)

• Yes, you read that right—1000Hz in the 868/900MHz domain! While this mode is designed for maximum data throughput when used with MAVLink, don't let the 1000Hz fool you; during development, it was tested for long-range performance.

DK500 (Coming in ExpressLRS V3.5)

• Designed specifically from the ground up for speed enthusiasts and RC reliability. K modes are next-generation FSK modulation with built-in packet repair (Forward Error Correction). Similar to FLRC D500, DK500 sends repeat packets to minimize packet loss in challenging race environments. Paired with a Gemini-enabled Tx and Rx, nothing compares to its RC reliability.

NEW PACKET RATES
Sub-GHz 200Hz Full (-111dBm)

• Optimized for MAVLink: Double the packet rate of current 900MHz SX1276 hardware, tailored specifically for MAVLink users to provide a more robust link and reduced interference.

Dual Band X100Hz Full (-112dBm)

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

Dual Band X150Hz (-112dBm)

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

Sub-GHz 250Hz (-111dBm)

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

Specifications

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

Includes

• 1x RadioMaster DBR4 Dual-Band Xross Gemini ExpressLRS Receiver
• 4x 3mm Black Vibration Dampeners
• 4x 4mm Red Vibration Dampeners
• 1x Manual Card
• 1x CRSF Wire