RadioMaster XR3 Nano Multi-Frequency Diversity ExpressLRS Receiver for FPV/RC, 2.4GHz & Sub-G 900MHz
RadioMaster XR3 Nano Multi-Frequency Diversity ExpressLRS Receiver for FPV/RC, 2.4GHz & Sub-G 900MHz
RadioMaster
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Overview
The RadioMaster XR3 Nano is a compact ExpressLRS receiver featuring multi-frequency operation (2.4GHz or Sub-G 900MHz) and antenna diversity for stable control links in RF-challenging areas. It is built around the 3rd generation Semtech LR1121 transceiver with an ESP32C3 MCU, and supports Wi-Fi configuration and firmware updates via WebUI.
For help choosing the correct antenna or region/version for a build, contact https://rcdrone.top/ or email support@rcdrone.top.
Key Features
- Multi-frequency operation: 2.4GHz or Sub-G 900MHz
- Antenna diversity
- Semtech LR1121 transceiver (3rd generation)
- MCU: ESP32C3
- Built-in Wi-Fi for configuration and firmware updates (WebUI)
- Skyworks RFX2401C: LNA (boost sensitivity), PA (up to 100mW telemetry), and antenna switching for diversity
- Additional UART for future expansion (pads labeled TX2 / RX2); primary pads labeled RX / TX / 5V
- Secondary port for advanced functionality
- Castled pads for easier soldering
Specifications
| Item | XR3 Nano Multi-Frequency Antenna Diversity ExpressLRS Receiver (XR3 Nano ExpressLRS Receiver) |
| Type / Region (as listed) | ISM2.4; CE868; FCC915 |
| MCU | ESP32C3 |
| RF Chip | LR1121 |
| RF Connector | IPEX-1 x 2 |
| Antenna | 2 x T-Antenna (either 2.4GHz, 900MHz, or Dual-band depending on selected package) |
| Frequency Range | 2.4GHz / Sub-G 900MHz (also shown as: ISM 2.4GHz / FCC915 / EU868) |
| Telemetry Power | 100mW |
| Maximum packet rate / receive refresh rate | 500Hz / K1000Hz (also listed as: DK500Hz / K1000Hz) |
| Minimum packet refresh rate / receiver refresh rate | 25Hz |
| Working Voltage | DC 4.5 - 8.4V |
| Weight | 1.3g (without antenna) |
| Dimensions | 22mm * 15mm * 4mm (board size also shown as 22.00MM x 15.00MM) |
| Firmware Version | ExpressLRS v3.5.1 pre-installed |
| FW Target | RadioMaster XR3 2.4/900 Diversity RX |
| Bus Interface 1 | CRSF |
| Bus Interface 2 | UART |
Antenna Options (Tailored to Your Needs)
The XR3 receiver is offered with different antenna selections: 2.4GHz, Sub-G 900MHz, or a Dual-Band antenna. The receiver includes only the selected antenna type (2.4GHz, 900MHz, or Dual-Band). The XR3 is capable of 2.4GHz or Sub-G 900MHz; using a Dual-Band antenna allows either frequency without needing to change antennas.
Compatibility
Radio compatibility (as listed)
Compatible with existing RadioMaster ExpressLRS radios and modules, including: TX16S MKII, BOXER, GX12, TX12 MKII, ZORRO, POCKET, MT12; and RadioMaster ExpressLRS modules: RANGER, BANDIT, NOMAD.
LR1121 Receiver Frequency Chart (as shown)
| Receiver | 2.4GHz | 900MHz | Gem-X 2.4GHz+900MHz Dual-Band |
|---|---|---|---|
| XR1 | YES | YES | NO |
| XR2 | YES | NO | NO |
| XR3 | YES | YES | NO |
| XR4 | YES | YES | YES |
| Notes (as shown): Requires 2.4GHz or Dual-Band Antenna; Requires 900MHz or Dual-Band Antenna; Requires Dual-Band Antennas | |||
ExpressLRS Dual-band Mode Compatibility Chart (as shown)
- Modulation Modes: FLRC, LoRa, FSK
- Frequency Band: 2.4G Band (2400 - 2480 GHz); Low Band (433, 866, 868, 915 MHz); GemX Dual Band (2.4G + Low)
- Note: D in the name indicates DVDA modes. Full in the name indicates full resolution modes.
| Module | Chip Type | Listed packet rates / modes |
|---|---|---|
| Ranger | 2.4G (SX128x) | FLRC: F1000 Hz, F500 Hz, D500 Hz, D250 Hz; LoRa: 500 Hz, Full 333 Hz, 250 Hz, 150 Hz, Full 100 Hz, 50Hz |
| Nomad | Dual (LR1121) | LoRa: 200 Hz, Full 100 Hz, 100 Hz, 50 Hz, 500 Hz, Full 333 Hz, 250 Hz, 150 Hz, Full 100 Hz, 50 Hz, X150 Hz, Full X100 Hz, 250 Hz, Full 200 Hz; FSK: DK 500 Hz, Full K1000 Hz; Available with ELRS v3.4 |
| Bandit | Low (SX127x) | LoRa: 200 Hz, Full 100 Hz, 100 Hz, 50 Hz, 25 Hz, D 50 Hz |
What’s Included
- 1 x XR3 Nano Multi-Frequency Antenna Diversity ExpressLRS Receiver
- 2 x T Antenna (either 2.4GHz, 900MHz, or Dual-band depending on selected package)
- 1 x CRSF wire
- 3 x Heat-shrinkable tube
- 1 x Manual card
Downloads
Associated Products (names only)
- XR1 Nano Multi-Frequency ExpressLRS Receiver
- XR2 Nano 2.4GHz ExpressLRS Receiver
- XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver
- 2.4GHz / Sub-G 900MHz Dual-Band T Antenna
- UFL 2.4GHz T Antenna 65mm/95mm for ELRS Receivers
- UFL 915/868MHz T & Y Antenna for BR Series Receivers
Details
A compact RadioMaster XR3 Nano ExpressLRS receiver combines multi-frequency support with true antenna diversity for dependable control links.
Onboard LNA/PA design helps boost sensitivity while supporting higher-power telemetry for demanding flight environments.
Choose 2.4GHz, 900MHz, or a dual-band T-antenna package to match your build and region requirements.
Built on the Semtech LR1121 transceiver, the XR3 platform supports operation on 2.4GHz or Sub-G 900MHz bands.
Extra TX2/RX2 pads provide an additional UART for future expansion while keeping primary RX/TX/5V pads easy to access.
The ultra-light receiver weight helps keep small FPV builds efficient without sacrificing link features.
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