Matek MLRS MAVLink 900MHz TX Module KIT, MR900-30-TX
by Matek Systems

mR900-30 900MHz LoRa Transmitter Module with mRx-Tx Adapter

The mR900-30 is a powerful 900MHz LoRa transmitter module, ideal for enhancing long-range communication in UAVs and other remote control applications. Featuring the STM32G431KB MCU with mLRS firmware and the LoRa SX1262 chip with TCXO, this module offers exceptional RF power up to 30dBm (1000mW) for both 915MHz and 868MHz frequencies. The mR900-30 is equipped with an IPEX MHF-1 connector and includes adapters for SMA and RP-SMA antennas.

The mRx-Tx Adapter further extends the functionality with a built-in HC-04 Bluetooth module, a 5V fan controller for optimal cooling at high power outputs, and dual LEDs to indicate mLRS and Bluetooth status. The adapter also includes a convenient one-button interface for DFU mode and binding, making it easy to integrate into your system.

Specifications:

• mR900-30 Module:
  • MCU: STM32G431KB, mLRS firmware
  • LoRa Chip: SX1262 with TCXO
  • RF Frequency: 900MHz (868MHz, 915MHz FCC)
  • RF Power:
    • 915MHz: 21dBm(min), 22dBm, 24dBm, 27dBm, 30dBm (1000mW)
    • 868MHz: 24dBm(min), 24dBm, 27dBm, 30dBm (1000mW)
  • Antenna Connector: IPEX MHF-1 to SMA
• mRx-Tx Adapter:
  • Bluetooth Module: Built-in HC-04
  • Fan Controller: 5V, runs if output power >=500mW
  • Communication: TX2 RC IN (CRSF)
  • Power Supply: 5-13V DC @ JR_PIN3 (VIN)
  • LED Indicators: Red and Green for mLRS status, Blue for Bluetooth status

In the Box:

• 1x mR900-30-TX module
• 1x IPEX MHF1 to SMA adapter cable (5cm)
• 1x IPEX MHF1 to RP-SMA adapter cable (5cm)
• 1x 5V Fan (25x25x10mm) with screws

LED Status Indicators:

• Red flashing 2Hz: Not connected to transmitter
• Green flashing 1Hz: Connected to transmitter
• Red and Green alternating: Binding mode enabled

Binding Instructions: After powering on, press the bind button for approximately 4 seconds. The LEDs will blink alternately in red and green at 2.5 Hz when in binding mode.

Firmware:

• mLRS Firmware: mLRS GitHub Repository
• Target: tx-matek-mr900-30-g431kb-default