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Fernando,
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The QMX includes techniques first developed for the QCX and QDX.
There sections in each assembly and/or operations manual that delve into how it works.
They are not always terse.
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The Wiki of this forum has lots of good information too.
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Do a web search for "hans summers fdim" to find presentations Hans has given.
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The above is all QRP-Labs specific
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For basic knowledge on how radios work, I can think of nothing better than Experimental Methods in RF Design (EMRFD).
It was written over 20 years ago and is now out of print, getting difficult to find used.
Personally, I think it is a major sin for the ARRL to not keep it available, at least as an ebook.
A thorough search of the web might find ways to obtain it.
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The Radio Amateur's Handbook by the ARRL has lots of good theory and practical design, well worth owning.
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RF Design Basics by the RSGB looks promising though I have never read it.
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Many amateurs limp by without a thorough understanding of complex impedance.
As the name implies, this involves values of the form? ?a+jb? ?in the complex plane.
In electronics we use j for sqrt(-1) since I so so often used for current.
I can't think of a book I'd recommend though I'm sure they are out there.
What I can recommend is obtaining a nanoVNA, it is a very useful tool for the radio amateur
and is all about measuring complex impedances.
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Digital Signal Processing is where you will find a good deal of math to puzzle over,
it is the foundation to how the software in the QMX works (and the hardware of the QCX).
An excellent introduction to this is this free book on the web offered by analog.com:
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Also free from analog.com is the excellent LTSpice simulator, it allows you to model working circuits on your computer.
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Perhaps others could recommend other sources of information.
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Jerry, KE7ER
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On Fri, Jan 24, 2025 at 01:25 PM, Fernando TUSELL wrote:
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