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ELRS_TX_MODULES.md

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mLRS Documentation: ELRS Tx Modules (External and Internal)

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Important

868/915 MHz ELRS Tx modules are only compatible with ELRS 868/915 and Frsky R9 receivers; they are incompatible with SX126x/STM32WLE hardware (MatekSys mR900, SeeedStudio Wio-E5, EBYTE E77 MBL, E77 Easy Solder)(see here).

Note

mLRS only supports 400k baudrate, for external Tx modules navigate to MODEL SETTINGS->MODEL SETUP->External RF and select Mode = CRSF and Baudrate = 400k; for internal Tx modules navigate to SYS->HARDWARE and select Type = CRSF and Baudrate = 400k.

External Modules

mLRS supports the following ELRS external modules:

Module Target Frequency Band Transmit Power
BetaFPV Micro 1W tx-betafpv-micro-1w-2400 2.4 GHz 30 dBm (1000 mW)
RadioMaster Bandit tx-radiomaster-bandit-900 868/915 MHz 30 dBm (1000 mW)
RadioMaster Bandit Micro tx-radiomaster-bandit-micro-900 868/915 MHz 30 dBm (1000 mW)

Flashing External Modules

Important

The BetaFPV Micro 1W requires specific dip switch settings to flash and operate, these are detailed in the BetaFPV section.

Flashing external modules is done using the mLRS Flasher Desktop App - this is found here.

Steps to flash:

  1. Plug the module into the computer using USB
  2. Launch the mLRS Flasher Desktop App
  3. Select Tx Module (external) from the left menu
  4. Select the Device Type, Firmware Version and Firmware File appropriate for your radio
  5. Select the correct serial port
  6. Click Flash Tx Module, wait for the flash to finish
  7. Unplug the USB cable

Flashing the Wireless Bridge on External Modules

Important

To flash the Wireless Bridge, you will need the mLRS firmware installed - this is done by following the steps outlined above.

  1. Plug the module into the computer using USB
  2. Launch the mLRS Flasher Desktop App
  3. Select Tx Module (external) from the left menu
  4. Select the Device Type, Firmware Version and Firmware File appropriate for your radio
  5. Follow the instructions under 'Wireless Bridge' to allow flashing
  6. Click Flash Wireless Bridge, wait for the flash to finish
  7. Unplug the USB cable

BetaFPV Micro 1W Dip Switch Settings

The BetaFPV Micro 1W has 7 dip switches which need to be set correctly depending on the operation mode, refer to the following table:

Operation Mode Dip Switches On Dip Switches Off
Flash module or use USB for serial 1,2 3,4,5,6,7
Flash Wireless Bridge 5,6,7 1,2,3,4
Use Wireless Bridge for serial 3,4 1,2,5,6,7

Internal Modules

mLRS supports the ELRS internal modules on the following radios:

Radio Target Frequency Band Transmit Power
Jumper T20 V2, T15, T14, T-Pro S tx-jumper-internal-900 868/915 MHz 30 dBm (1000 mW)
Jumper T20 V1, T20 V2, T15, T14, T-Pro S tx-jumper-internal-2400 2.4 GHz 30 dBm (1000 mW)
RadioMaster Boxer tx-radiomaster-internal-boxer-2400 2.4 GHz 30 dBm (1000 mW)
RadioMaster Pocket, MT12, TX12, TX16S, Zorro tx-radiomaster-internal-2400 2.4 GHz 24 dBm (250 mW)

Flashing Internal Modules

Flashing internal modules is done using the mLRS Flasher Desktop App - this is found here.

Steps to flash:

  1. Power the radio on
  2. Plug the radio into the computer using USB, select 'USB Serial (VCP)' from the menu
  3. Launch the mLRS Flasher Desktop App
  4. Select Tx Module (internal) from the left menu
  5. Select the Device Type, Firmware Version and Firmware File appropriate for your radio
  6. Click Flash Tx Module, wait for the flash to finish
  7. Unplug the USB cable

Flashing the Wireless Bridge on Internal Modules

Important

To flash the Wireless Bridge, you will need the mLRS firmware installed - this is done by following the steps outlined above.

  1. Plug the radio into the computer using USB, select 'USB Serial (VCP)' from the menu
  2. Launch the mLRS Flasher Desktop App
  3. Select Tx Module (internal) from the left menu
  4. Select the Device Type, Firmware Version and Firmware File appropriate for your radio
  5. Click Flash Wireless Bridge, wait for the flash to finish
  6. Unplug the USB cable