Pulse Position Modulation (PPM)
PPM output is by far the most widely supported format for a trainer connection. Almost every radio that has a trainer port will support it.
There are a few options with PPM you can choose
Output Pin
Channels
The Frame Length
Sync Pulse
Inverted
The default settings should work for most radios. You may need to play with the sync pulse time in the GUI so your radio can pick it up. Also try inverted too if you can't get a connection.
Many radios use a 3.5mm headphone jack for their trainer connection. You can cut an old headphone cable to use if this is your case. Most are a 3 pin device, you will need to determine what the tip wire is and the base ground wire. See the wiring diagram for details.
Always refer to your manual of your radio for the proper plug and setup.
!!! Some radios have been found to output too high of a voltage on the trainer port. So far just the Spektrum DX18. This is causing the Nano33BLE to fail. Please do not use with this radio until a solution is posted.
Radio Setup
There are too many radios to list them all but if your using OpenTX or EdgeTX, you only need to set the Trainer mode to Master/Jack at the bottom of your model page. Then set the channels you want to use as TRx under the mixes page. You can verify the channel data the same way as you would with SBUS https://headtracker.gitbook.io/head-tracker/getting-started/wiring/option-2-wired/serial-bus-sbus/radio-master-tx16s-setup#verifying-the-operation
For other radios please refer to your manual.
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