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mLRS MAVLink 900MHz TX Module KIT, mR900-30-TX
Brand: Matek
Product Code: mR900-30-TX
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mLRS MAVLink 900MHz TX Module KIT, mR900-30-TX
Description
1. Product Overview
1.1. Product Description
The Matek mLRS 900MHz TX Module Kit (mR900-30-TX) is a high-power, long-range transmitter module designed for mLRS (MAVLink Long Range System) applications. It operates in the 900MHz ISM band (868MHz / 915MHz depending on region) and combines MAVLink telemetry and RC link in a single device. With an integrated cooling fan and adjustable output power up to 30dBm (1W), it ensures exceptional range and signal reliability for UAVs, FPV drones, and fixed-wing aircraft.
1.2. Key Features
- Powered by STM32G431KB MCU running open-source mLRS firmware.
- LoRa SX1262 transceiver with TCXO for stable frequency performance.
- Adjustable output power levels: 21 / 22 / 24 / 27 / 30dBm (max).
- Operates in 900MHz ISM band (868MHz / 915MHz selectable).
- Integrated Bluetooth module for configuration and firmware update.
- Built-in cooling fan activated automatically when high power is used (500mW).
- Supports both MAVLink telemetry and RC control link.
- Compatible with mLRS receivers (900MHz series only).
- Includes antenna adapter cables (IPEX → SMA and IPEX → RP-SMA).
- Wide input voltage range: 5–13VDC.
2. Technical Specifications
Table 2-1. mR900-30-TX Transmitter Specifications
| Parameter | Specification |
|---|---|
| Firmware | mLRS (MAVLink Long Range System) |
| Processor | STM32G431KB |
| RF Chipset | LoRa SX1262 with TCXO |
| PA / LNA | SKY68383-11 or equivalent high-power front end |
| Frequency Band | 900MHz ISM (868MHz / 915MHz configurable) |
| Output Power | 21 / 22 / 24 / 27 / 30dBm (max ≈1W) |
| Voltage Input | 5–13VDC via JR_PIN3 (VIN) |
| Average Current | ~350mA @ 5V |
| Peak Current | ~900mA @ 5V (at 30dBm output) |
| Antenna Connector | IPEX MHF-1 (adapter cables to SMA/RP-SMA included) |
| Bluetooth Module | Integrated HC-04 module for wireless setup |
| Cooling System | Automatic 5V fan (runs when power 500mW) |
3. Kit Contents
- 1 × mR900-30-TX module
- 1 × IPEX MHF-1 → SMA adapter cable (5cm)
- 1 × IPEX MHF-1 → RP-SMA adapter cable (5cm)
- 1 × 5V cooling fan (25×25×10mm) with screws
- Note: Antenna and 3D-printed case are not always included.
4. LED Indicators
| Indicator | State | Description |
|---|---|---|
| Red LED | Flashing ~2Hz | No link / not connected |
| Green LED | Flashing ~1Hz | Linked and connected |
| Red + Green (alternating) | Active | Binding mode enabled |
5. Installation Configuration
- Use compatible mLRS 900MHz receivers; not compatible with ELRS or FrSky R9.
- Connect 5–13V DC power to VIN pin on the JR bay adapter.
- Attach antenna securely before powering on to prevent RF damage.
- Use Bluetooth or USB interface for firmware updates and configuration.
- For high-power operation (27dBm), ensure good cooling and adequate ventilation.
- Confirm correct antenna for selected band (868MHz or 915MHz).
- Regulatory compliance: verify transmission power limits in your region.
6. Applications
- Long-range UAVs: Provides stable telemetry and RC control.
- FPV Aircraft: Combines control and MAVLink data into a single module.
- Professional Drones: Enables real-time telemetry streaming with high reliability.
- Autonomous Platforms: Suitable for MAVLink-based autopilot systems.
7. Practical Summary
The Matek mLRS 900MHz TX Module Kit (mR900-30-TX) offers a robust, configurable long-range transmitter solution for UAVs, FPV, and professional aerial systems. Featuring LoRa SX1262 technology, Bluetooth configuration, and up to 1W output power, it provides exceptional range and stability in telemetry-heavy environments. Ideal for pilots and engineers requiring a high-performance communication module with integrated cooling and open-source flexibility.
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