"Unfortunately, I can not connect the no-audio tx fault to any particular operation"
I have seen this problem several times but I have not found a way to reproduce it reliably. My impression is that it happens when a TX is manually initiated within the first second of the transmit period. I have never seen it when the QSO is auto sequenced. Perhaps the vulnerability is manually initiating a TX in the period between normal CAT TX enable time and normal modulation start time. I don't remember seeing the problem with ver 2.1.0 but it was present in several prior versions. What is constant for all times I have seen the problem is that a normal TX happens if the failed TX is stopped and immediately re-started. 73, Andy, k3wyc
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