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

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

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

Experience unparalleled long-range connectivity with the Matek mR900-30 MAVLink long range system.

Equipped with MAVLink firmware and a 900 MHz LoRa band, the Matek mR900-22 receiver boasts 20 dBm RF power for optimal transmission strength. Stay connected with confidence and clarity.

Check out all our External Modules/Receivers Collection, and the rest of our Matek products!

Wiring:

Modes & Link Rate

Firmware Flashing:

Download STM32CubeProgrammer from ST website

https://www.st.com/en/development-tools/stm32cubeprog.html

mLRS firmware:

https://github.com/olliw42/mLRS/tree/v1.3/firmware/release-matek
Targets: rx-matek-mr900-22-wle5cc-xxx

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Connect the mR900-22 to USB-TTL module (e.g.CP210x, FTDI)

mR900-22 RX2 — USB-TTL module TX
mR900-22 TX2 — USB-TTL module RX
mR900-22 V — USB-TTL module 5V
mR900-22 G — USB-TTL module GND

Connect USB-TTL module to computer while holding the receiver boot button in.

Select UART
Select the COM port of USB-TTL module
Connect
select “Erasing & Programming”
Tick all sectors and click “erase selected sectors”
Browse firmware (hex or bin file) related to the hardware.
Click “Start Programming”
After programming, unplug USB and plug USB back in. If red LED blinks at 2Hz, the receiver is waiting for connecting with transmitter.

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/v1.3/firmware/release-matek
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.

Package Includes:

1 x mR900-22

Matek mR900-22 mLRS (MAVLink long range system) firmware 22dBm RF power 900MHz Receiver