So I think the discussion about pin headers for the PA transistors is adventurous. The most important point with all devices QCX, QDX and now QMX is absolutely the use of a tuner. The antenna needs to be adjusted. This has now been cleverly solved with the QDX with the SWR bridge. The QMX will not work without an adapted antenna.

Of course, if you do WSPR with 12V or even 13.8V with the QCX or QDX, you damage the device and yourself.

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Yesterday I did FT8 with the QMX for about an hour, with 12V. You could no longer touch the device because it was too hot. It didn't do him any harm. So use thermal paste. Then the PA transistors have a low thermal resistance and everything is chic.

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73 Reinhard DL3AS

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The sockets work out great on the QDX. I'm about to try them on a QMX so can't say how that works. Space may be tight.