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With the QMX+ being a kit, any published value of MDS would have to be a range of fluid values since receiver characteristics will depend, not only on component tolerance deviations, but of builder's methods in soldering and the winding of toroids & transformers.
I decided to compare my QMX+ receiver sensitivity with the KX2 and FT-891, using a TinySA Ultra and appropriate attenuation.
As can be seen in the video below, the QMX+ does quite well.
After the video, I "measured" (by ear) the point at which a signal becomes too weak to copy on the other bands. The CP1 directional coupler does not cover 6 meters but I measured -113 dBm on that band, which is probably inaccurate. I will sweep the coupler on 6m with my VNA and post a corrected value soon.
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In actual use, I'm very pleased with the sensitivity of my home-built High Band QMX. And these results give me more confidence about my subjective sense of its sensitivity. THANKS John!
ReplyDeleteI should have done this right after building the rig (or any kit). But it validates what on-the-air experience tells me.
Delete73,
John