Modifying the BCX Transmitter

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Modifying the Blade CX Transmitter

This page shows how to modify the Blade CX Transmitter to interface to the PC via the microphone socket and work with PRE-Flight. It needs no solder joins and only requires 2 plugs to be installed, and the modification is completely reversible (as long as it is done properly). The 4 screws at the back of the Transmitter are the only screws removed. The removal of circuit boards and other delicate components are not required.

Important note: Read all the instructions before attempting any modifications! Also, read the following conditions before starting:

1) The modification will only work with the full versions of PRE-Flight (including the Standard Edition, Dragonfly Edition, Blade Edition, and T-Rex Edition) - it will not work with the demo version. It will not work with any other simulators.
2) Opening your transmitter will probably void any warranties.
3) The modification has been extensively tested on several transmitters and proven to work but due to the nature of the modification, there are no guarantees that it will work with your transmitter.
4) The modification applies only to the Blade CX Transmitter - the Blade CP transmitters do not need to be modified to work with PRE-Flight.
5) The modification requires the PRE-Flight Interface Cable which comes with the full version of PRE-Flight (if you specify the Blade CX transmitter). Order PRE-Flight here
6) Read all warnings in this modification to avoid problems.
7) This modification is supplied as is. The author assumes no liability for damages, direct or consequential, which may result from this modification or from the use of Pre-Flight.

Checking your Transmitter:

Make sure your transmitter is a Blade CX Transmitter. Blade CX Transmitters have a small dome-shaped cover at the back of the case:

Important Notes on Modification:

1) The transmitter is a fragile electronic device. Care is required in following the procedure below.
2) The transmitter components are susceptible to electrostatic damage. Avoid touching any components unnecessarily.
3) Make sure your hands and tools are not electrostatically charged before proceeding.

Tools and Materials Required:

1) The Interface Cable from PRE-Flight. See this link to order.
2) Small Philips head screwdriver.
3) Small ruler for measuring in millimeters.


1) Remove the battery cover.

2) Remove the batteries.

3) Remove the 4 screws that hold the back of the Transmitter case with a small Philips head screwdriver:

4) Carefully unhook the cable where indicated so you can have clear access to the inside.

5) Gently remove the dome cover by compressing the clips on the inside of the case. This may be glued - pry the glue loose before removing. Keep the cover so you can re-cover the hole later.

6) Thread the free end of the Interface Cable thru the dome hole. Pull the end out to about 230mm.

7) Loop the cable as indicated to keep from being pulled out.

8) Locate the group of 5-pins in the circuit board.

9) Plug the Red Socket into Pin 3. Push gently as far as it will go.

10) Plug the Yellow Socket into Pin 5. Push gently as far as it will go.

11) Make sure the cable does not cause shorts or fouls any moving parts:

12) Re-hook the cable - see step 4.

13) Close the case and re-install the 4 screws.

14) Re-install batteries and cover.

This concludes the modification. Reversal of this modification is a matter of removing the cable interface and replacing the domed cover.

Warning: Do not connect the plug into any socket other than the microphone socket of a PC. Damage may result to both TX and PC if this is not observed. Also, do not apply static electricity to the plug.

Turn the Transmitter on and insert the chrome plug into the microphone socket of the PC when prompted by PRE-Flight. The cable may be coiled and secured by tape when not it use.

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