• RadioMaster XR1 Nano multi-frequency ExpressLRS receiver with T antenna and U.FL connector
  • Close-up of RadioMaster XR1 Nano ExpressLRS receiver front showing RX TX 5V pads and U.FL antenna port
  • Angled view of XR1 Nano multi-frequency ExpressLRS receiver PCB with solder pads and onboard button
  • Wide T antenna layout connected to XR1 Nano receiver, centered on white background
  • Back side of XR1 Nano receiver PCB showing component layout and 5V TX RX solder pad labels
  • Angled rear view of XR1 Nano receiver PCB with 5V TX RX pads and test points visible
  • Macro close-up of XR1 Nano receiver front with U.FL antenna connector, onboard button, and RX TX 5V pads
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RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz/Sub-G 900MHz LR1121 for RC builds

RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz/Sub-G 900MHz LR1121 for RC builds

RadioMaster

$21.79 USD
$21.79 USD
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Overview

The XR1 Nano Multi-Frequency ExpressLRS receiver is an ultra-compact 20mm × 13mm module designed for a wide range of RC builds. It uses a 3rd generation Semtech LR1121 transceiver to operate on either the 2.4GHz or Sub-G 900MHz bands, and features built-in Wi-Fi for configuration and firmware updates via a WebUI on PC or mobile devices.

Key Features

  • Multi-frequency operation: 2.4GHz or Sub-G 900MHz
  • Telemetry power: 100mW
  • MCU: ESP32C3
  • RF chip: Semtech LR1121 (3rd generation)
  • Secondary UART port (additional UART for future expansion; TX2/RX2 pads)
  • Castellated pads for easier soldering
  • Built-in Wi-Fi for configuration and firmware updates (WebUI)
  • Compatibility note (as labeled): compatible with existing RadioMaster ExpressLRS radios and modules

Specifications

Item XR1 Nano Multi-Frequency ExpressLRS Receiver
Type ISM_2.4 or FCC_915 (CE868 is also listed in provided product text)
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
Maximum packet rate DK500Hz / K1000Hz
Minimum packet refresh rate 50Hz
Working voltage 5V
Weight 1.0g (without antenna)
Dimensions 20mm * 13mm * 3mm (also shown as 20.00MM × 13.00MM)
Firmware version ExpressLRS v3.5.1 pre-installed
FW target RadioMaster XR1 2.4/900 RX
Bus interface 1 CRSF
Bus interface 2 UART

Tailored to Your Needs

The XR1 Receiver is available with different antenna selections: 2.4GHz, Sub-G 900MHz, or a Dual-Band antenna option. The receiver includes only the selected antenna type. A Dual-Band antenna allows switching between 2.4GHz and Sub-G 900MHz without changing antennas.

LR1121 Receiver Frequency Chart (as labeled): XR1 supports 2.4GHz (YES), 900MHz (YES), Gem-X 2.4GHz+900MHz Dual-Band (NO). It requires a 2.4GHz or Dual-Band antenna for 2.4GHz operation, and a 900MHz or Dual-Band antenna for 900MHz operation.

What’s Included

  • 1 * XR1 Nano Multi-Frequency ExpressLRS Receiver
  • 1 * T Antenna (either 2.4GHz, 900Mhz, or Dual-band depending on selected package)
  • 1 * CRSF wire
  • 3 * Heat-shrinkable tube
  • 1 * Manual card

Applications

  • ExpressLRS RC control link for FPV drones, multirotors, RC planes, and other compact RC builds
  • CRSF receiver integration with flight controllers

For order assistance or setup questions, contact https://rcdrone.top/ or email support@rcdrone.top.

For ExpressLRS documentation and general support information, visit https://www.expresslrs.org/.

Details

RadioMaster XR1 Nano multi-frequency ExpressLRS receiver with LR1121, 2.4GHz/Sub-G 900MHz support

The XR1 Nano packs ExpressLRS performance into a compact receiver that can run on either 2.4GHz or Sub-G 900MHz.

XR1 Nano receiver with 2.4GHz, 900MHz and dual-band T-antenna options for RC builds

Choose a 2.4GHz, 900MHz, or dual-band T-antenna to match your preferred band and build style.

Semtech LR1121 3rd-generation transceiver graphic for XR1 multi-frequency ExpressLRS receiver

A 3rd-generation Semtech LR1121 transceiver enables flexible operation across 2.4GHz and Sub-G 900MHz bands.

Close-up of XR1 receiver solder pads highlighting secondary UART TX2/RX2 for future expansion

Extra TX2/RX2 pads provide a secondary UART for future expansion or custom wiring needs.

Ultra-compact XR1 Nano receiver next to earbuds highlighting small size and 1.0g lightweight design

Built for tight spaces, the board measures 20×13mm and weighs about 1.0g without the antenna.

Compatibility graphic: XR1 ExpressLRS receiver works with existing RadioMaster ExpressLRS radios and modules

Designed to pair with existing RadioMaster ExpressLRS radios and modules for a straightforward setup.

LR1121 receiver frequency chart for XR1/XR2/XR3/XR4 with 2.4GHz, 900MHz and dual-band support tableExpressLRS dual-band mode compatibility chart comparing Ranger, Nomad and Bandit modulation modes and ratesXR1 Nano ExpressLRS receiver specifications table: ESP32C3, LR1121, IPEX-1, 5V, 100mW telemetryXR1 Nano ExpressLRS receiver on digital scale indicating approximately 1.0g weight (without antenna)XR1 Nano receiver dimension view with 20.00mm by 13.00mm footprint and IPEX antenna connectorPackage contents: XR1 Nano receiver, selected T-antenna, CRSF wire, three heat-shrink tubes, manual card

Everything needed for basic installation is included: receiver, selected antenna, CRSF lead, and heat-shrink tubing.

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