HELLO ALL
As of July 16th:
I gave the Nano VNA talk in two installments to the Leicester Radio Society (UK) but I did not record it and I did not post it. I'll contact the person who did post it and see what happened to it.
I only reference this (recorded) video as the latest talk I have given on the Nano VNA
Part I was the basic stuff - very low math but I do mention Smith Chart
I treat the nano VNA as just another tool in your ham radio toolkit
I show how you can use the Nano VNA to check out coax, filters, and antennas.
All of the graphs were produced by NANO VNA SAVER software (free, Win 10).
THANK YOU to the author of that app.
Part II Uner the Hood - looks at all of the measurements and calculated parameters in more detail.
You can Calibrate the Nano VNA via software (Nano VNA SAVER) and do a lot more with the tool.
I then go into gory detail about the Smith Chart - but not assuming one is already familiar with it.
Part II ends with looking at resistance, reactance, and impedance and how these plot on Smith Charts.
How do antenna tuners "cancel" the reactance on your feedline by introducig a CONJUGATE match?
There is a bit of magic and fancy math, but I try to avoid that.
Warning: there is a Smith Chart quiz in the talk and in the PDF.
Conclusion: antennas do not "need to be resonant" to work well (i.e. 43 ft vertical) but the entire antenna system (including feed line) needs to present a reasonable load to your rig. The typical SWR meter gives you a reading (2:1) but gives no information as to what you can do to improve your antenna.
Thus, the Nano VNA is a much better "tool" at analyzing your antenna than a mere SWR meter.
This is the best I've been able to do and explain (as a non-engineer) after one year experience with VNA.
If I can get it posted again, feel free to share both the video and the extended PDF with others.
This has been and continues to be a learning challenge for me.
There are many ways to "see" a concept. I'm looking for a 9th grade level right now.
I hope my video Zoom and the PDF is aiming at the right audience.
73
K3EUI Barry
Philadelphia
K3euibarry@...
Barry K3EUI