I believe that in the newest firmware as of now (016) that the QMX will mute the sidetone when the transceiver enters protection mode. But that should not make it lock up.
I experienced a total lock-up of the QMX while in practice mode one time earlier this week which surprised me. But it hasn't happened since. I run Iambic B at 22 WPM when practicing. I don't use a dummy load, I put the QMX in Practice mode (which prevents it from transmitting RF).
It's possible that something with your dummy load setup, like an unreliable connection somewhere, is allowing RF back into the QMX, which can definitely manifest itself as a total lock up.
If it happens to me again whilst in practice mode, I'll report back.
73
Roy - KI0ER?
