Radiomaster XR3 Nano Multi-Frequency ExpressLRS Receiver User Manual

1. はじめに

The Radiomaster XR3 Nano Multi-Frequency ExpressLRS Receiver is a compact and versatile receiver designed for remote control applications, offering robust signal stability and extended range. It supports both 2.4GHz and Sub-G 900MHz frequency bands, making it suitable for various setups. This manual provides essential information for the proper installation, operation, and maintenance of your XR3 receiver.

Image 1.1: Radiomaster XR3 Nano Multi-Frequency ExpressLRS Receiver with connected dual-band antennas.

2. 安全情報

Please refer to this instruction manual before use. Improper handling or installation may lead to equipment damage or personal injury. Ensure all connections are correct and secure before powering on the device. This product is recommended for users aged 18 years and up.

3. 特徴

• アンテナの多様性: Utilizes two antennas for improved signal stability and extended range, featuring a Skyworks RFX2401C for enhanced receiver performance and telemetry.
• マルチ周波数サポート: Operates on both 2.4GHz and Sub-G 900MHz bands.
• 高性能MCU: Equipped with an ESP32C3 microcontroller.
• Advanced Transceiver: Features a Semtech LR1121 transceiver.
• 追加の接続: Includes an additional UART port and secondary port for advanced functionality.
• 簡単なはんだ付け： Designed with castled pads for convenient soldering.
• 統合WiFi: Built-in WiFi for effortless configuration and firmware updates via an intuitive WebUI。
• コンパクトなデザイン: Ultra-compact dimensions (22mm x 15mm x 4mm) and lightweight (1.3g without antennas).

画像3.1: 以上view of the XR3 receiver highlighting its multi-frequency, antenna diversity, LR1121, and ExpressLRS features.

4. パッケージ内容

パッケージにすべてのアイテムが含まれていることを確認します。

• 1 * XR3 ナノマルチ周波数アンテナダイバーシティ ExpressLRS 受信機
• 2 * T Antenna (Either 2.4GHz, 900Mhz, or Dual-band, depending on selected package)
• CRSFワイヤー1本
• 熱収縮チューブ3本
• マニュアルカード1枚

5. セットアップ

5.1 物理的な接続

Connect the XR3 receiver to your flight controller or other compatible device using the provided CRSF wire. Ensure correct polarity and pin assignments for 5V, TX (Transmit), and RX (Receive).

• 5V： Power input (DC 4.5-8.4V)
• TX： Telemetry data output from receiver
• 処方箋： Control data input to receiver

画像5.1: クローズアップ view of the XR3 receiver board, indicating the 5V, TX, and RX pads for connection.

5.2 アンテナの設置

Carefully connect the two T-antennas to the IPEX-1 connectors on the receiver board. Ensure they are securely attached. Position the antennas to maximize signal reception, typically at a 90-degree angle to each other for optimal diversity.

5.3 バインディング（ペアリング）

The XR3 receiver uses the ExpressLRS protocol for binding. Follow these general steps:

1. Power on your receiver three times, cycling power quickly. The LED on the receiver should flash rapidly, indicating it is in bind mode.
2. On your ExpressLRS compatible transmitter, initiate the binding process. Refer to your transmitter's manual for specific instructions.
3. バインドされると、受信機の LED が点灯し、接続が成功したことを示します。

Alternatively, the XR3 features a bind button. Press and hold the bind button while powering on the receiver to enter bind mode. The receiver also supports binding via WiFi.

画像5.2: トップダウン view of the XR3 receiver board, showing the location of the bind button.

5.4ファームウェアアップデート

The XR3 receiver supports firmware updates via its built-in WiFi. Connect to the receiver's WiFi network using a PC or mobile device and access the WebUI to manage settings and update firmware. Ensure you are using the correct firmware target: "RadioMaster XR3 2.4/900 Diversity RX".

6.運用

6.1 周波数の選択

The XR3 receiver is capable of operating on either 2.4GHz or Sub-G 900MHz frequencies. The type of antenna included with your package determines the primary operating frequency. If you have a dual-band antenna, the receiver can switch between 2.4GHz and 900MHz without requiring an antenna change. Ensure your transmitter is configured to match the receiver's operating frequency.

Image 6.1: The XR3 receiver supports various antenna types for 2.4GHz, Sub-G 900MHz, or Dual-Band operation.

6.2 ExpressLRS Functionality

Once bound, the XR3 receiver will communicate with your ExpressLRS transmitter, providing control and telemetry data. The antenna diversity feature automatically selects the best signal from the two antennas, enhancing link quality and range, especially in challenging RF environments. The telemetry power output is 100mW.

Image 6.2: The XR3 receiver incorporates a Low-Noise amplifier to boost sensitivity and a Power amplifier for extended telemetry range.

7. メンテナンス

The XR3 receiver is designed for durability, but proper care can extend its lifespan:

• 受信機を清潔に保ち、ほこり、汚れ、湿気を避けてください。
• 受信機を極端な温度や直射日光に長時間さらさないでください。
• Ensure antenna connections are secure but do not overtighten.
• Regularly check for any visible damage to the board or antennas.

8。 トラブルシューティング

If you encounter issues with your XR3 receiver, consider the following:

• バインドなし: Ensure the receiver is in bind mode (rapidly flashing LED) and your transmitter is attempting to bind on the correct ExpressLRS firmware version and frequency. Check power connections.
• 信号/範囲が弱い: Verify antenna connections and positioning. Ensure no obstructions are blocking the signal path. Check for local RF interference. Confirm the correct frequency band (2.4GHz or 900MHz) is selected on both receiver and transmitter.
• テレメトリなし: Check the TX/RX wiring between the receiver and flight controller. Ensure CRSF protocol is correctly configured in your flight controller and transmitter.
• 受信機の電源が入らない: 電源volを確認してくださいtage (DC 4.5-8.4V) and polarity. Inspect for any short circuits or damaged components.

9. 仕様

Image 9.1: LR1121 Receiver Frequency Chart, showing compatibility across different XR models.

Image 9.2: ExpressLRS Dual-band Mode Compatibility Chart, detailing modulation modes and frequency bands for various modules.

10. 保証とサポート

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