Specifications

• STM32WLE5CC with TCXO,  mLRS firmware
• RF Frequency: 900MHz (868MHz, 915MHz FCC)
• RF power: -9dBm(min) / 0dBm / 10dBm / 20dBm / 22dBm(158mW)
• Antenna connector: IPEX MHF-1
• TX2/RX2: Bi-directional Serial MAVLink
• TX1: RC out(CRSF or SBUS)
• 2x buttons for Boot mode and Bind

• Power supply: 4-9V DC @ “V” Pad
• Power dissipation:  67mA@5V IN(31Hz, 22dbm)
• PCB Size: 24 x 15.5 mm
• Weight: 2.3g w/ antenna

• Packing:
  • 1x mR900-22
  • 1x IPEX MHF1 dipole antenna. 8cm

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-matek-mr900-22-wle5cc-xxx

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
• mR900-22 is NOT compatible with ELRS 900MHz / Frsky R9 series using the SX127x. They will not bind with each other.