Georgy, I'm experimenting with this issue on my branch. I've reproduced the "flow" you suggested:
* switch BASE to USB-D (or LSB-D)
* (optional) change TX power to minimal
* Start TX
* wait some time (I guess it should be within 10...100ms)
* Stop TX
* Restore power
* Restore mode
but still no success with TXing voice messages.
?
Here are my early attempts:
Do you have any other suggestions? Btw. do you know what is the root cause of this issue?
73 de Jarek SP9HGN