Receiver RadioMaster DBR4 Dual band Xross Gemini ELRS 2.4G/900M

The RadioMaster DBR4 Dual Band Xross Gemini is an ExpressLRS receiver designed for FPV drones and other compatible radio-controlled models.

Supporting both 2.4GHz and 900MHz frequency bands, the receiver features Xross Gemini technology, two Semtech LR1121 RF chips and four antennas. This dual-band configuration provides additional flexibility for compatible ExpressLRS radio systems.

The receiver supports refresh rates from 50Hz to 500Hz and offers up to 100mW telemetry output power. It comes with ExpressLRS v3.3.2 firmware pre-installed and uses the CRSF communication interface.

With a compact 27.2 × 27.2mm design and a weight of just 5.3g including antennas, the DBR4 is suitable for a variety of compatible FPV drone configurations.

Features:

• Dual-band ExpressLRS receiver supporting 2.4GHz and 900MHz

• Xross Gemini technology

• Dual Semtech LR1121 RF chips

• Four antennas for dual-band operation

• Maximum 500Hz refresh rate

• Up to 100mW telemetry RF output

• ExpressLRS v3.3.2 firmware pre-installed

• CRSF communication interface

• Compact and lightweight design

Specifications:

• Brand: RadioMaster

• Model: DBR4 Dual Band Xross Gemini

• Receiver Type: ISM_2.4 / FCC_915

• MCU: ESP32

• RF Chip: 2 × Semtech LR1121

• Frequency Range: 2.404–2.479GHz / 903.5–926.9MHz

• Telemetry RF Power: Up to 100mW

• Antennas: 2 × 2.4GHz / 2 × 900MHz

• Maximum Refresh Rate: 500Hz

• Minimum Refresh Rate: 50Hz

• Operating Voltage: 4.5–8.4V DC

• Weight Without Antennas: 2.7g

• Weight With Antennas: 5.3g

• Dimensions: 27.2 × 27.2mm

• Firmware: ExpressLRS v3.3.2 (pre-installed)

• Bus Interface: CRSF