The sensitivity of my QMX+ is pretty good, but I don't have a spec for you.? I have not had any problems with the receiver.? Being a QRP rig, you will be able to hear many more stations than can hear you.? I have been using mine primarily for FT8 and I am almost always giving the other station a much better signal report than they are giving me, which tells me the receiver has more than adequate performance for 2 way communication.
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It does cover all of the bands on your list, except 8m.? It also covers 11m for the regions where that is allowed.
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Steve KA0SM
