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iRangeX IRX4 2.4GHz 4-in-1 STM32 Multiprotocol TX Module

iRangeX IRX4 2.4GHz 4-in-1 STM32 Multiprotocol TX Module


If you have been in this hobby for a while, you will likely have amassed quite a collection of RC models and not necessarily all of them bound to the same radio control, so probably a collection of them too. That's where this multiprotocol TX module will come in handy. It incorporates four RF chips into one transmitter module and supports pretty much all of the communication protocols used in the RC hobby so that you can control everything from a single radio; from toy grade Syma models to FrSky racing drones or Spektrum BNF aircraft. 

The module is designed to work with transmitters that operate with OpenTX 2.2.X, so all FrSky transmitters and other brands too. OpenTX 2.2.X has special support for the iRangeX IRX4 that allows the protocols to be easily selected from the transmitter SETUP menu or Companion. This particular Multiprotocol Module features a STEM32 microcontroller (MCU), which has enough on-board storage space to store all of the protocols you need without having to re-flash it.


  • Ensure radio is flashed with OpenTX version 2.2.X (Firmware Download) (Flashing Guide)
  • Install module into transmitter’s external module bay
  • Set default Channel Order (Radio Setup Menu) to AETR
  • In the Setup Menu, disable Internal RF “OFF” and Enable External RF
  • For the External RF Mode select “Multi” then select the required Protocol to match your model
  • Enable Auto Bind for supported models

RF Chips: CC2500, NRF24L01, A7105 and CYRF6936

Supported Protocols:

  • Flysky (Generation I protocol, based on A7105, tested)
  • Hubsan (Based on A7105, tested)
  • Frsky (Based on CC2500, tested)
  • Hisky (Based on 24L01, tested)
  • V2x2 (Based on 24L01)
  • DSM2 / DSMX (Based on CYRF6936, tested)
  • Devo (Based on CYRF6936, tested)
  • YD717 (Based on 24L01)
  • KN (V977,Based on 24L01, tested)
  • SymaX (Based on 24L01)
  • SLT (Based on 24L01)
  • CX10 (Based on 24L01)
  • CG-023

Compatible Transmitter:

  • Frsky: All the frsky transmitters
  • TBS: Tango
  • Futaba: Futaba S-FHSS transmitters
  • Flysky: TH9X (Note: The plastic base on the transmitter needs to be removed to fit this module)
  • Turnigy: 9XR,9XR Pro
  • Others: Transmitters running Open TX Firmware with a 5-Pin Module Bay

  • Operating Voltage: 5-14V
  • Operating Current: <=100mA
  • RF Power: 22dBm
  • Firmware: STM32F103C8T6
  • Dimension: 49x22x65mm
  • Weight: 40g


  • iRangeX IRX4 2.4GHz Multiprotocol TX Module

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