RadioMaster - DBR4 Dual Band Xross Gemini ExpressLRS Receiver
by RadioMaster

Elevate your RC experience with the DBR4 Receiver, the ultimate companion to the RadioMaster Nomad. The DBR4 is a state-of-the-art dual-band, dual-channel Gemini receiver designed to maximize performance and reliability. Featuring advanced dual-band technology, the DBR4 can simultaneously receive 2.4GHz and 900MHz signals, ensuring robust and interference-free communication. Its innovative design supports two discrete data streams, providing exceptional signal stability and reducing the risk of packet loss.

With its dual-band capability and superior interference rejection, the DBR4 is engineered for peak performance in any environment. Whether you're racing or exploring new terrains, trust the DBR4 to keep your signal strong and dependable.

Features:

• Dual-Band Reception: Simultaneously receives 2.4GHz and 900MHz signals.
• Exceptional Interference Rejection: Dual-band ELRS Gemini Xrossband technology.
• Telemetry RF Power: Max 2x 100mW for reliable data transmission.
• Optimized Antenna Setup: Four discrete antennas for superior signal reception.
• Mounting Flexibility: 20 x 20mm mounting holes for easy installation.
• Enhanced Performance: Speed Boost and K Modes for faster packet rates and robust link reliability.

Specifications:

• 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 wire antennas, 2 x 900MHz wire antennas
• Frequency Range: 2.404 - 2.479 GHz / 903.5 - 926.9 MHz
• Maximum Receive Refresh Rate: 500Hz (1000Hz in ExpressLRS V3.4)
• Minimum Receiver Refresh Rate: 50Hz
• Working Voltage: DC 4.5 - 8.4V
• Weight: 2.70g (without antennas), 5.30g (with antennas)
• Dimensions: 27.20 x 27.20 mm
• Firmware Version: ExpressLRS v3.3.2 pre-installed
• Bus Interface: CRSF

New Packet Rates:

• Sub-GHz 250Hz (-111dBm)
• Sub-GHz 200Hz Full (-111dBm)
• Dual Band X150Hz (-112dBm)
• Dual Band X100Hz Full (-112dBm)
• K500 (Coming in ExpressLRS V3.5)
• K1000 Full SubGHs (Coming in ExpressLRS V3.5)

Package Includes:

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