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 mR900-30 receiver boasts 30 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!

Setup:

Use mR24-30 as a TX module : tx-matek-mr900-30-g431kb-default-xxx

Use mR24-30 as a TX in SiKTelem mode : tx-matek-mr900-30-g431kb-siktelem-xxx

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 Receiver: rx-matek-mr900-30-g431kb
- TX module mode: tx-matek-mr900-30-g431kb-default
- TX SiKtelem mode: tx-matek-mr900-30-g431kb-siktelem

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Make sure DFU driver has been installed. Check out “Install DFU Drivers” in this page

Connect the Receiver USB to computer while holding the boot button in.

Select USB
USB1 and click Refresh
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.

*** You can also flash it via INAV or BetaFlight configurator, load firmware local, just like flashing a flight crontroller.

Com / CLI Commands:

Install serial_port_utility
Firmware tx-matek-mr900-30-g431kb-default, USB = COM/CLI, connect USB directly to computer, install STM VCP driver, select STM32 COM port
Firmware tx-matek-mr900-30-g431kb-siktelem, LT1/LR1 = COM/CLI, connect USB-TTL module to LT1/LR1, select USB-TTL COM port
more CLI commands details.

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

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 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.

Package Includes:

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

Matek mR900-30 mLRS (MAVLink long range system) firmware 30dBm RF power 900MHz Receiver