RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz
RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz is an exceptionally compact ELRS receiver designed for builds where every gram and millimetre matters. It weighs only 1.0 g without the antenna, measures 20 mm x 13 mm x 3 mm, provides 100 mW RF telemetry power and uses the CRSF interface. Built-in Wi-Fi makes configuration and firmware updates easier.
RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz – Full ExpressLRS Performance in a Nano Format
The RadioMaster XR1 combines compact dimensions with the functionality required in modern RC and FPV builds. Its RF section is based on the Semtech LR1121 transceiver paired with an ESP32C3 MCU. Communication with a flight controller or another compatible device is handled through CRSF, while an additional UART provides more integration flexibility. Built-in Wi-Fi and WebUI support also make receiver configuration and firmware updates accessible from a computer or mobile device. This product page applies exclusively to the 2.4 GHz configuration.
RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz Key Features
- ExpressLRS 2.4 GHz – a widely used RC control system providing a fast radio link with telemetry support.
- Only 1.0 g without the antenna – well suited to lightweight builds where electronics weight matters.
- 20 mm x 13 mm x 3 mm dimensions – the compact PCB is easier to fit into tightly packed installations.
- 100 mW RF telemetry power – provides two-way ExpressLRS communication with telemetry.
- Semtech LR1121 and ESP32C3 – the hardware platform used in the XR1 receiver.
- CRSF plus an additional UART – provides flexibility when integrating the receiver with compatible serial devices.
- Built-in Wi-Fi and WebUI – simplifies receiver configuration and firmware updating without a separate programmer.
- IPEX-1 antenna connector – a compact RF connection for the receiver antenna.
- Castellated solder pads – make wiring easier during installation.
Minimal Weight, More Installation Freedom
At only 1.0 g without the antenna, the XR1 adds very little weight to the model. Its compact format is particularly useful when electronics need to fit into a limited space, making the receiver easier to include in a tightly planned FPV drone, RC wing or other CRSF-based build.
Additional UART Leaves Room for Expansion
In addition to its primary CRSF interface, the XR1 provides an additional UART. This gives integrators more flexibility when planning the model's electronics and leaves another serial interface available for configurations capable of making use of it.
20 mm x 13 mm – Easier to Fit into Compact Builds
The receiver PCB measures only 20 mm x 13 mm, while the manufacturer's full specification gives a thickness of 3 mm. These compact dimensions make it easier to organise the installation and preserve space for a flight controller, FPV system, power electronics or other equipment.
RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz Applications
The XR1 is intended for builds using ExpressLRS 2.4 GHz and the CRSF interface. Its low weight and compact dimensions make it particularly useful in FPV drones, RC wings, fixed-wing models and other space-limited projects where the receiver connects to a flight controller or another CRSF-compatible device.
Before integration, check the required supply voltage and UART connection scheme specified by the particular controller being used.
RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz Important Information Before Purchase
This product page applies exclusively to the 2.4 GHz version. The receiver should be used with a T antenna intended for 2.4 GHz, while the transmitter side requires an appropriately configured ExpressLRS 2.4 GHz radio or module.
The XR1 uses CRSF/UART communication and is not a conventional multi-channel PWM receiver with separate servo outputs. Before ordering, make sure the device connected to the XR1 supports CRSF.
Frequently Asked Questions - RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz
Yes. This product page and package configuration apply to the 2.4 GHz version with an antenna intended for that band. RadioMaster identifies the selected 2.4GHz variant with SKU HP0157.XR1-2400.
The receiver weighs 1.0 g without the antenna. This makes it well suited to lightweight and compact builds where the mass of every electronic component matters.
The receiver measures 20 mm x 13 mm x 3 mm. Its small footprint makes installation easier in builds with limited internal space.
Yes, provided that the flight controller supports CRSF and supplies the required 5 V power. The XR1 uses serial communication, so the controller documentation and UART assignments should be checked before soldering.
Yes. The XR1 includes built-in Wi-Fi with access to WebUI, making it easier to configure the receiver and update firmware from a computer or mobile device.
Yes. In addition to the CRSF interface, the manufacturer provides a secondary UART, giving integrators additional flexibility when planning more complex builds.
RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz Specification
Item
| RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz |
Type
|
ISM 2.4GHz
|
MCU
| ESP32C3 |
RF Chip
| Semtech LR1121 |
RF Connector
| IPEX-1 |
Antenna | 1x 2.4GHz T-Antenna |
Frequency Range | 2.4GHz |
Telemetry Power | 100 mW |
Maximum Packet Rate | DK500Hz / K1000Hz |
Minimum Packet Refresh Rate | 50Hz |
Working Voltage | 5V |
Weight | 1.0g without antenna |
Dimensions | 20mm x 13mm x 3mm |
Firmware Version | ExpressLRS v3.5.1 pre-installed |
Primary Interface | CRSF |
Additional Interface | UART |
RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz Package Contents
- 1x RadioMaster XR1 Nano Multi-Frequency ExpressLRS Receiver 2.4GHz
- 1x 2.4GHz T Antenna
- 1x CRSF Wire
- 3x Heat-Shrink Tubes