MatekSys mR900-30-TX mLRS 900MHz TX module kit (MAVLink/MSP) with mRx-Tx adapter, Bluetooth

Overview

MatekSys mR900-30-TX is a 900MHz TX module kit (mLRS) designed for MAVLink/MSP and RC channel links. The kit includes the mR900-30 TX module and the mRx-Tx adapter with built-in Bluetooth and a fan controller for higher output power operation.

Key Features

• mLRS firmware on STM32G431KB
• LoRa SX1262 with TCXO
• PA/LNA: SE2435L
• Built-in HC-04 Bluetooth module (BT2.0 + BLE)
• Built-in 5V fan controller (fan runs if output power >= 500mW)
• Button for DFU mode and Bind
• Red/Green LEDs for mLRS status; Blue LED for Bluetooth status

Specifications

What’s Included

• 1x mR900-30-TX
• 1x IPEX MHF1 to SMA adapter cable 5cm
• 1x IPEX MHF1 to RP-SMA adapter cable 5cm
• 1x 5V Fan (25*25*10mm) and screws

• No SMA antenna included
• No 3D printed case included

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

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 will blink alternatively with ca 2.5 Hz.
• https://github.com/olliw42/mLRS-docu/blob/master/docs/BINDING.md

Firmware

• mLRS: https://github.com/olliw42/mLRS/tree/main/firmware/pre-release-stm32
• Target: tx-matek-mr900-30-g431kb-default

Routing and Layout

• Bi-directional serial: mavlink/MSP (UARTx_TX, UARTx_RX)
• RC channels: CRSF or SBUS (UARTy_RX)
• Power pins shown: 5V and G

Dip switch

• Dip switch functions (as labeled):
• 3: BT module Power ON/OFF
• 2: Rx1 to BT Tx ON/OFF
• 1: Tx1 to BT Rx ON/OFF

• Dip switch 1/2/3 all ON: enable HC-04 communication with UART1 of STM32G431 (also shown as ON position “to the left”).
• Dip switch 3 ON, 1 & 2 OFF: connect USB-TTL to G/3v3/BT-T/BT-R to configure HC-04 via AT command.
• Dip switch 1/2/3 all OFF: connect other Bluetooth or WiFi module to G/3v3/Rx1/Tx1 (also shown as OFF position “to the right”).

Manuals

• JR Bay Case 3D print (stl): https://www.mateksys.com/Downloads/other/Matek_mLRS_JRBay.zip
• mRX-TX Adapter 3D (step): https://www.mateksys.com/Downloads/other/mRX-TX_step.zip
• mLRS GitHub: https://github.com/olliw42/mLRS
• mLRS 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/

Compatibility Note

• MATEKSYS mLRS 900MHz series are NOT compatible with ELRS 900MHz & Frsky R9 series using the SX127x. They will not bind with each other.

Details

The mR900-30-TX mLRS 900MHz TX kit includes an mRx-Tx adapter with USB-C, two SMA pigtails, mounting screws, and a small fan, with 5–13V DC input and built-in Bluetooth.

The mR900-30-TX kit supports Bluetooth setup plus MAVLink/MSP telemetry and RC channels over CRSF or SBUS to a flight controller UART.

The MatekSys mRx-Tx adapter includes an onboard HC-04 Bluetooth module, DIP switch, and clearly labeled UART/3.3V/GND pins for straightforward MAVLink/MSP wiring.