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Turnigy 9x Trainer Port Resistor Mod

Update 04/27/2012 – Good news. It looks like there is no more need to cut the trace and solder in the resistor as demonstrated in this post unless you’re still running stock firmware.

The latest ER9X firmware has a an option call “Enable PPMSIM” in the Radio Setup screen. It allows you to turn it ON and the er9x firmware routes the PPM signal to the trainer port through a alternate path. Therefore, it bypasses the module and thus the need to add the resistor.

Original Post below…

Here’s my quick writeup on the trainer port resistor mod.

First, some helpful links to original articles on this. They contain a description of the problem and the solution.

  1. Original PDF on “Fixing the 9x PPM in problem”
  2. A more visual description of the issue and illustrated steps to fix.
  3. An updated version of the above with a video.

I prefer to use version 3.

The reason is because it has since been discovered that the problem only appear to affect the Turnigy 9x module. Others have noted that using an Assan module or FrSky module in the back doesn’t exhibit the issue.

Therefore, instead of modding the transmitter. We are going to apply the fix to only the Turnigy module. This is also simplier because you only have to unscrew two screws instead of the 6 screws + unfasten a wire harness to gain access to the Turnigy rear board.

Please follow the above video for a howto. It’s pretty simple and well done.

  • Use a 1k resistor. (I chose to use SMD)
  • Cut the trace with an xacto knife or file.
  • Solder on the 1k ohm resistor. (surface mounted 102 resistor)

Here’s a photo for your reference:

5 Comments on Turnigy 9x Trainer Port Resistor Mod

Module from MLP4DSM Wired Up

Here’s the module taken from the MLP4DSM transmitter that comes with E-Flite RTF kits. It shows the wiring necessary for hookup to the Turnigy 9x running custom firmware that supports the DSM2 protocol.

See this post for location of the 3.3v pad to solder the red wire to.

I added an LED inline with the PPM signal wire. Because the LED is a diode, it drops the voltage of the PPM line from 5v to the 3.3v that the DSM2 module can handle.

To protect the entire assembly, I used 1/2″ clear shrink tube. The clear shrink tube allows me to see the status LED onboard the DMS2 module.

Everything is working great with the latest th9x firmware. I was able to bind to my mSR by holding the trainer switch while powering up the transmitter.

On the er9x front. Mike Blandford was able to get the th9x source code properly added to the er9x firmware. Use build r635 or later. I was successful in using his firmware in connecting the Turnigy 9x TX to the mSR. Great job Mike!

*04/23/2012 Update*
This setup continues to work without a hitch for me. I have since bound to and controlled the following Blade models successfully: mCX2, mSR, mCP X, 120SR and mSR X.

13 Comments on Module from MLP4DSM Wired Up