Receiver

RadioMaster DBR4

Name: RadioMaster DBR4
Brand: RadioMaster

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Four antennas on a 20x20 board, receiving both bands at once.

Specification last checked 2026-07-27

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Recorded specification

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Property	Value	Source
Control link protocol decides fitThe transmitter-to-receiver RF protocol. NOT the same as the receiver-to-FC serial protocol.	ExpressLRS	RadioMaster product specificationschecked 2026-07-27Quote 1, below the table
Control bands supported decides fitSome radios and receivers work on more than one band, and a few use both at once.	2.4 GHz900 MHz (exact band not published)	RadioMaster product specificationschecked 2026-07-27Quote 1, below the table
Receiver output protocol decides fitHow the receiver talks to the flight controller. CRSF is used by both ELRS and Crossfire.	CRSF	RadioMaster product specificationschecked 2026-07-27Quote 1, below the table
Antenna diversityA second antenna, so the link survives one of them being shadowed by the airframe or pointing the wrong way. On a quad that rotates constantly, that is the difference between a glitch and a failsafe.	Yes	RadioMaster product specificationschecked 2026-07-27Quote 2, below the table
True diversityTwo complete receivers, not just two antennas sharing one. Both are sold as "diversity"; only this one is listening on both at once.	Yes	RadioMaster product specificationschecked 2026-07-27Quote 2, below the table
WeightBuild-critical rather than compat-critical: needed to answer registration and class questions.	2.7 g	RadioMaster product specificationschecked 2026-07-27Quote 1, below the table

RadioMaster product specificationschecked 2026-07-27DBR4 Dual Band Xross Gemini ExpressLRS Receiver: MCU: ESP32; RF Chips: Semtech LR1121 x 2; Frequency Range: 2.404 - 2.479 GHz / 903.5 - 926.9 MHz; Antennas: 4 Discrete Antennas, 2 x 2.4GHz wires & 2 x 900MHz wires; Weight: Without antennas 2.70g / With antennas 5.30g; Dimensions: 27.20 * 27.20mm with 20x20 Mounting Holes; Working Voltage: DC 4.5 - 8.4V; Bus Interface: CRSF; Telemetry RF Power: Max 100mW; Receiver Refresh Rate: Maximum 500Hz, minimum 50Hz; Firmware: ExpressLRS v3.3.2 pre-installed
RadioMaster product specificationschecked 2026-07-27the DBR4 boasts two dual-band sections, each capable of simultaneously receiving 2.4GHz and 900MHz signals. This innovative design allows for the reception of two data streams simultaneously; 4 Descrete antennas for optimal antenna arrangement

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What this fits

Checked against every other product in the catalog by the same engine the planner runs, rule by rule. Where a specification is missing the answer is unknown, which is a different answer from compatible.