To close the subject, the problem was with me, not with the QMX+.?
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I don't know what I did last week (may have been transmitting on 10m into a 15m tuned dipole), but the rig finally would not switch on and I thought I had fried it.? A few days later Hans asked me to check voltage on receive.? Honestly!? I was sure that it wouldn't switch on.? But it did, and is working flawlessly.
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Lesson:? If you keep trying to transmit with an 'S' constantly appearing on the display, and finally the rig won't switch on, don't despair.? Give it some time, check and re-check your settings and try again.
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Tim Ei2KA