MATEKSYS MR900-30 MAVLink 900MHz Receiver (mLRS, SX1262 TCXO, IPEX MHF-1, 4.5-13V DC)

Overview

The MATEKSYS MR900-30 is a MAVLink 900MHz receiver for long-range, bi-directional serial data links. It is based on STM32G431KB and LoRa SX1262 with TCXO, and supports mLRS firmware for MAVLink/MSP serial linking and RC output options.

Key Features

• mLRS firmware support (MR900-30 target: rx-matek-mr900-30-g431kb)
• LoRa SX1262 with TCXO; PA/LNA SE2435L
• Bi-directional serial MAVLink on TX1/RX1
• RC output on TX2 (CRSF or SBUS)
• USB Type-C on board
• One button for DFU mode and bind
• Antenna connector: IPEX MHF-1
• Board labeling includes Fan-IO pad

Customer service: https://rcdrone.top/ or support@rcdrone.top.

Compatibility Notice

MATEKSYS mLRS 900MHz series using SX126x/STM32WLE5 LoRa chip are NOT compatible with ELRS 900MHz / Frsky R9 series using the SX127x. They will not bind with each other.

Reference: https://github.com/olliw42/mLRS-docu/blob/master/docs/SX126x_SX127x_INCOMPATIBILITY.md

LoRa chip SX126x (e.g. mR900-30, E22) and STM32WLE5xx (e.g. mR900-22, WIO-E5, E77) are compatible with each other.

Specifications

What's Included

• 1x mR900-30
• 1x IPEX MHF1 dipole antenna, 8cm
• 1x Heatsink, 20*20*6mm

LED Status

• [Red flashing 2Hz]: not connected to transmitter
• [Green flashing 1Hz]: 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 alternatively with ca. 2.5Hz.
• Reference: https://github.com/olliw42/mLRS-docu/blob/master/docs/BINDING.md

Firmware

• mLRS pre-release firmware: https://github.com/olliw42/mLRS/tree/main/firmware/pre-release-stm32
• Targets:
  • RX Receiver: rx-matek-mr900-30-g431kb
  • TX module mode: tx-matek-mr900-30-g431kb-default
  • TX SiKTelem mode: tx-matek-mr900-30-g431kb-siktelem

Routing and Settings

TX module mode (tx-matek-mr900-30-g431kb-default)

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

SiKTelem mode (tx-matek-mr900-30-g431kb-siktelem)

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

Receiver settings (rx-matek-mr900-30-g431kb)

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

Manuals / Documents

• mLRS project: https://github.com/olliw42/mLRS
• mLRS documentation: https://github.com/olliw42/mLRS-docu/tree/master

Details

The MATEKSYS mR900-30 900MHz MAVLink receiver uses a compact 29x21mm PCB with an IPEX MHF-1 antenna connector and USB port for easy setup and wiring.

MR900-30 wiring uses UART TX/RX for bi-directional MAVLink/MSP plus 5V and GND, with RC channels via CRSF or SBUS to the flight controller.

USB‑C configuration and a simple UART TX/RX, 5V, and G connection support bi-directional MAVLink/MSP serial to a flight controller.