Just had the same since yesterday. I installed the small PTT push button in the orange cable coming from Raduino board and going to the microphone key jack. Now th problem is over.
You can now do a CAT PTT with the CEC firmware (with or without a plug in the key jack) or a manual PTT when the plug is in the mic key jack.
I have used JS8CALL and WSJT-x to test PTT.
I have not transmitted so far.
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PE3ES - F4VTQ - Erwin
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