RadioMaster DBR4 Dual Band Xross Gemini ExpressLRS Receiver

The RadioMaster DBR4 is a dual-band, dual-channel ExpressLRS Gemini receiver designed as the companion to the RadioMaster Nomad module. It has two dual-band sections, each able to receive 2.4GHz and 900MHz at the same time, and four separate wire antennas you can place for the best coverage – ideal for long-range and fixed-wing builds where every packet counts.

Key features

• Two dual-band sections – 2.4GHz and 900MHz received simultaneously
• ExpressLRS Gemini on 2.4GHz and 868/900MHz, plus Gemini Xrossband (Gem-X)
• Four discrete antennas for flexible placement
• Two Semtech LR1121 transceivers
• Telemetry power up to 100mW
• 20 x 20mm mounting holes, vibration dampeners included

Specifications

Compatibility

• Ships on FCC 915MHz firmware (903.5-926.9MHz), which is the US band. In India the licence-free sub-GHz band is 865-867MHz - reflash radio and receiver to the ExpressLRS IN866 domain before using 900MHz. 2.4GHz needs no change.
• Full Gem-X needs a dual-band transmitter: GX12, TX16S MK3 / MK3 MAX or the Nomad module.
• Mounting: 20 x 20mm holes - fits a 20x20 stack position or fixed-wing bay. Too large for whoops and small cinewhoops.
• Wiring: CRSF to an FC UART, 4.5-8.4V supply.

Works with (available at AeroFlow)

• RadioMaster Nomad Dual 1W Gemini Xrossband module
• RadioMaster GX12 Dual-Band radio, TX16S MK3
• Fixed-wing FCs: Matek Wing V3, TBS Lucid H7 Wing

In the box

• 1x DBR4 Gemini Xrossband receiver
• 2x 2.4GHz wire antenna
• 2x 900MHz wire antenna
• 1x CRSF wire
• 4x 4mm red vibration dampeners
• 4x 3mm black vibration dampeners
• 1x manual card