Receiver

RadioMaster XR4 Gemini Xrossband

Name: RadioMaster XR4 Gemini Xrossband
Brand: RadioMaster

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Two complete receivers listening on both bands at once, in 1.7 grams.

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 connector decides fit	U.FL / IPEX	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.	1.7 g	RadioMaster product specificationschecked 2026-07-27Quote 1, below the table

RadioMaster product specificationschecked 2026-07-27The XR4 Receiver is a cutting-edge true diversity dual-band receiver featuring dual LR1121 RF transceivers, designed to leverage the advanced ExpressLRS Gemini Xrossband protocol (Gem-X). It seamlessly supports both the 2.4GHz and Sub-G 900MHz bands, and its dual T-type antennas provide superior reception sensitivity and connection stability for optimal performance. Built with two independent RF circuits, the XR4 offers versatile operation modes, allowing you to switch between Gemini single-frequency or Xrossband dual-band modes. Item: XR4 Gemini Xrossband Dual-Band Receiver; MCU: ESP32D4; RF Chip: LR1121 x 2; RF Connector: IPEX-1 X 2; Antenna: Dual-Band T Antenna x 2 (Included); Frequency Range: 2.4GHz / Sub-G 900MHz; Telemetry Power: 100mw; Working Voltage: DC 4.5 - 8.4V; Weight: 1.7g (without antenna); Dimensions: 22mm * 18mm * 4mm; Firmware Version: ExpressLRS v3.5.1 pre-installed; Bus Interface 1: CRSF; Bus Interface 2: UART
RadioMaster product specificationschecked 2026-07-27The XR4 Receiver is a cutting-edge true diversity dual-band receiver featuring dual LR1121 RF transceivers. Built with two independent RF circuits, the XR4 offers versatile operation modes.

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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.