Specifications

• STM32G431KB,  mLRS firmware
• LoRa SX1262 with TCXO
• PA/LNA SE2435L
• RF Frequency: 900MHz (868MHz, 915MHz FCC)
• 915MHz RF power: 21dBm(min) / 22dBm / 24dBm / 27dBm / 30dBm(1000mW)
• 868MHz RF power: 24dBm(min) / 24dBm / 24dBm / 27dBm / 30dBm(1000mW)
• Antenna connector: IPEX MHF-1
• TX1/RX1: Bi-directional Serial MAVLink
• TX2: RC out(CRSF or SBUS)
• one buttom for DFU mode and Bind

• Power supply: 4.5-13V DC @ “V” Pad
• Power dissipation:  340mA@5V IN(31Hz, 30dbm)
• PCB Size: 29x21mm
• Weight: 5.3g w/ antenna

• Packing:
  • 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 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
• 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

Tips

• mLRS Github  & Documentation
• mLRS Discord
• mLRS Facebook group
• If set RF power >=500mW, It is recommended to attach the heatsink to the bottom side of PCB. The gaps between fins can be used for mounting with M3 screws
• MATEKSYS mLRS 900MHz series are NOT compatible with ELRS 900MHz & Frsky R9 series using the SX127x. They will not bind with each other.