MatekSys mR24-30 mLRS MAVLink 2.4GHz Receiver, LoRa SX1281 TCXO, 30 dBm 1 W, CRSF/SBUS

Overview

The MatekSys mR24-30 is an mLRS MAVLink 2.4GHz receiver designed for long-range communication in a compact PCB. It is based on STM32G431KB with mLRS firmware and uses a LoRa SX1281 (with TCXO) RF solution, with selectable RF power up to 30 dBm (1 W) on the 2.4GHz ISM band. Interfaces include bi-directional serial MAVLink and RC output (CRSF or SBUS), plus a button for DFU mode and binding.

Key Features

• STM32G431KB running mLRS firmware
• LoRa SX1281 with TCXO
• PA/LNA: SKY65383-11
• RF Frequency: 2.4GHz ISM
• RF power levels: 13 dBm (min) / 20 dBm / 24 dBm / 27 dBm / 30 dBm (1000 mW, 1 W)
• TX1/RX1: bi-directional serial MAVLink (diagram also labels bi-directional serial MAVLink/MSP)
• TX2: RC out (CRSF or SBUS)
• Antenna connector: IPEX MHF-1
• Button for DFU mode and bind
• Fan-IO pad labeled on PCB

Customer service: support@rcdrone.top (or visit https://rcdrone.top/).

Specifications

What's Included

• 1x mR24-30
• 1x IPEX MHF1 sleeve dipole antenna (15 cm)
• 1x heatsink (20 x 20 x 6 mm)

LED Status

• [Red flashing 2 Hz]: not connected to transmitter
• [Green flashing 1 Hz]: connected to transmitter
• [Red and Green alternately]: binding mode enabled

Binding

• After powering on, press the bind button (for ca. 4 seconds) on the receiver. When in bind mode, the green and red LEDs blink alternately with ca. 2.5 Hz.
• Guide: https://github.com/olliw42/mLRS-docu/blob/master/docs/BINDING.md

Firmware

• mLRS firmware: https://github.com/olliw42/mLRS/tree/main/firmware/pre-release-stm32
• Targets:
  • RX Receiver: rx-matek-mr24-30-g431kb
  • TX module mode: tx-matek-mr24-30-g431kb-default
  • TX SiKTelem mode: tx-matek-mr24-30-g431kb-siktelem

Tips

• mLRS GitHub: https://github.com/olliw42/mLRS and documentation: https://github.com/olliw42/mLRS-docu/tree/master
• mLRS Discord: https://discord.com/invite/vwjzCD6ws5
• mLRS Facebook group: https://www.facebook.com/groups/mlrslink/
• If RF power is set to >= 500 mW, attaching the heatsink to the bottom side of the PCB is recommended. The gaps between fins can be used for mounting with M3 screws.

Routing and Settings

Use mR24-30 as a TX module (tx-matek-mr24-30-g431kb-default)

• USB = COM/CLI
• TX1/RX1 = serial
• LT1/LR1 = serial2
• Tx Ch Source = CRSF
• Tx Ser Dest = serial
• Tx Ser Baudrate = 115200

Use mR24-30 as a TX in SiKTelem mode (tx-matek-mr24-30-g431kb-siktelem)

• USB = serial
• TX1/RX1 = serial2
• LT1/LR1 = COM/CLI
• Tx Ch Source = CRSF
• Tx Ser Dest = serial
• Tx Ser Baudrate = 115200

Receiver-side parameters shown in diagrams (rx-matek-mr24-30-g431kb)

• Rx Out Mode = CRSF or SBUS
• Rx Ser Link Mode = mavlinkX
• Rx Snd RadioStat = ardu_1
• Rx Ser Baudrate = 57600

Details

The MatekSys mR24-30 mLRS MAVLink 2.4GHz receiver uses a compact 28x21mm board with USB-C and clearly labeled pads for straightforward wiring.

The mR24-30 wiring supports bidirectional MAVLink/MSP over UART plus RC channel output via CRSF or SBUS to the flight controller.

SiKTelem mode supports bidirectional MAVLink/MSP over serial, with USB Type‑C on the ground unit and UART TX/RX plus 5V and G to the flight controller.