Hi,
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IMHO design and instructions for all QRP-Labs is exceptional and this is also often reason for many troubles and issues you see on the forum.
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I personally build 2 QMX and both times all was working straight off the bat. It is true that some tweaking with LPF/BPF is needed to get good results but this would happen with any kit available on the market. QMX is no different to uSDX, (tr)uSDX or mcHF in that respect.
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In the earlier days there were issues with blown finals but this is user errors (99%) now days software has protection build in so all you need to do read manual and switch it on. Still many builders fail to do that.
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QMX by design is portable rig, but to me it is a bit fragile electrically for that. What I mean that all needs to be connected in the right way and switched on at right sequence other wire you can blow your power supply or other parts. This is the only gripe I have. I still love these radios and repaired mine twice already but I want to use it and not have it in bits on my workbench.?
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When I say fragile I mean pulling power plug before switch off should not be a problem, connecting equipment (PA) in wrong moment also. So as long you do not ruch (as I do) and follow procedures you will be fine.
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73 de Marek SP9TKW
Marek SP9TKW