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Matek mLRS MAVLink 900MHz Receiver, mR900-30
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Opis
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: Average 340mA/Peak 850mA@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.
Routing and settings
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 and Link Rates
| 50 Hz | 31 Hz | 19 Hz | FLRC (111 Hz) | FSK (50 Hz) | |
| frequency bands | 2.4 GHz | 2.4 GHz | 2.4 GHz | 2.4 GHz | |
| / | 915/868 MHz | 915/868 MHz | / | 915/868 MHz | |
| / | 433 MHz/70 cm | 433 MHz/70 cm | / | 433 MHz/70 cm | |
| chip sets | SX128x | SX128x | SX128x | SX128x | |
| / | SX126x/LLCC68 | SX126x/LLCC68 | / | SX126x/LLCC68 | |
| / | STM32WLE5 | STM32WLE5 | / | STM32WLE5 | |
| / | / | SX1276 | / | ||
| downlink serial rate | 4100 Bytes/sec | 2562 Bytes/sec | 1547 Bytes/sec | 9111 Bytes/sec | 4100 Bytes/sec |
| uplink serial rate | 3200 Bytes/sec | 2000 Bytes/sec | 1207 Bytes/sec | 7111 Bytes/sec | 3200 Bytes/sec |
| receiver sensitivity | -105 dBm | -108 dBm | -112 dBm | not for LR | not for LR |
Firmware and flashing
Download STM32CubeProgrammer from ST website
mLRS firmware:
- 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
————————————————————————————————————
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.
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.
