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Yesterday I have successfully energized the QMX for the first time. As recommended, voltage to 7 volts, current to 250 milliamps. So far everything is fine.
Today I wanted to send for the first time. However, every time I pressed the paddle, a crackle and the QMX shuts down. Well, a loose contact? Are my soldering skills not good after all?
So I unscrew the case and start to examine the PCB and the paddle socket, but all is well.

But no, silly me, the QMX needs much more than 250 milliamperes to send. I just forgot to turn off the current limiter.
"If one has no work, one makes oneself some. :)
To the web SDR Heppen to Belgium, 220 km, with 3.8 watts to hear perfectly. What a dear little magic box!

I just did exactly the same thing, but I think the jump in the power supply voltage from going in and out of current limiting toasted something in my unit