Receiver

RadioMaster XR1 Nano

Name: RadioMaster XR1 Nano
Brand: RadioMaster

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One gram, and it works on 2.4 GHz or 900 MHz depending which antenna you fit.

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.	No	RadioMaster product specificationschecked 2026-07-27Quote 1, 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.	No	RadioMaster product specificationschecked 2026-07-27Quote 1, below the table
WeightBuild-critical rather than compat-critical: needed to answer registration and class questions.	1 g	RadioMaster product specificationschecked 2026-07-27Quote 1, below the table

RadioMaster product specificationschecked 2026-07-27The XR1 Receiver is a versatile, ultra-compact ExpressLRS receiver measuring just 20 × 13 mm. Powered by the third-generation Semtech LR1121 transceiver, the XR1 operates on either the 2.4 GHz or Sub-G 900 MHz bands. Item: XR1 Nano Multi-Frequency ExpressLRS Receiver; Type: ISM2.4 or CE868; MCU: ESP32C3; RF chip: Semtech LR1121; RF connector: IPEX-1; Antenna: 1x T-Antenna (Either 2.4GHz, 900Mhz or Dual-band depending on selected package); Frequency Range: 2.4GHz or Sub-G 900MHz; Telemetry Power: 100mW; Working voltage: 5V; Weight: 1.0g (without antenna); Dimension: 20mm × 13mm × 3mm; Firmware Version: ExpressLRS v3.5.1 pre-installed; Bus interface 1: CRSF; Bus interface 2: UART

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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.