I have just finished building a Rev 2 QMX+. It was a fun build and all went smoothly ... with a couple of minor exceptions.
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1) For some reason, PuTTY refused to work on my Win10 desktop (it had worked in the past). It recognized the QMX on a serial port but then it just "hung". Luckily, my Win11 laptop worked perfectly and I moved on to the diagnostics.
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2) Power out ranged from a high of 5.0 watts on 160 to 2.3W on 6 metres. (This is quite acceptable for sure.)
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3) The biggest problem was the image rejection on 160M. Here's a table of the results:
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Band????? Image
160????????? -3.8 (no the decimal point is correct!)
? 80????????? -37
? 60????????? -41
? 40????????? -43
? 30????????? -46
? 20????????? -50
? 17????????? -58
? 15????????? -36
? 12????????? -35
? 10 ? ?????? -38
??? 6????????? -20
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In an effort to resolve the 160M image problem I removed L401 and rewound it! Unfortunately nothing changed. I also went into the band configuration and changed the BPF from 0 to 1 just to see what happened. Nothing changed? So it looks like BPF 0 is not there for some reason?
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The chances of me using this rig on 160 with 2.3W are fairly remote, however, it would be nice to get the image numbers to a more reasonable level.
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Thoughts appreciated. Thanks!
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73, Rick
VE7TK
Website:
Rick Williams - VE7TK