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The Smith chart, of course, can be replaced by any of many software packages that yield just numerical results, but not the feel for what's going on. One may be really happy with incorrect numbers

Good. The less clutter the better. So far I display frequency and SWR. Impedance is just about ready to test. I will have to add the upside-down ohms symbol to my homebrew fonts when I do admittance.

Hi Brian, With regards to the marker, I can offer an opinion. I rarely used the raw reflection coefficient directly. I was looking to find a return loss, VSWR, or impedance, all of which would require

Do you refer to Phillip Smith's original paper? DaveD KC0WJN [email protected]> wrote:

Another useful input, Dean. I had not planned to do admittance, but adding it should not be hard. I've implemented a marker. You click near the curve to activate it. You can click again or rotate the

From the original publication in the early 1950s, the Smith Chart addressed impedance space, not just line lengths. I once had in my hands while working for a living (now retired) the original

Brian, While you're at it, the option of an admittance version of the Smith chart would be also helpful. 73, Dean W8ZF

Hi The Smith chart is simply a specific graphical method for illustrating impedances—originally as a function of line length, and now, with the NanoVNA, as a function of frequency. Its advantage

Paul, In your screenshot, the vertical grid line nearest the center is at 910.000 MHz, the nearest "round" number. Does that explain the offset you see? --John Gord

Yes, Dean points out an interesting aspect - if you look at it and it’s just spirals, you know a simple network is likely to work. If it’s back and forth zig zagging, probably not.

I appreciate the advice, Alan. Usually I only program features that I would use myself. I don't anticipate using the Smith chart and I have no experience with them so it's hard to know what detail is

Your density is finer than it needs to be. Which is ok. However, might consider the one standard that is: 0 , 10, 25, 50, 100, 250, and infinity... Same on both reactive contours.

Hi Brian, As an RF engineer, I depend on Smith charts for the intuitive understanding they enable. It is easy to look at at an impedance and instantly understand what would best match an impedance.

The marker will go to the nearest scan point. You have your H4 set for 101pts, you can set it to 401 for much finer resolution.

Question, why when I set a center frequency of 910.525 MHz on my Nano VNA-H4 (as I did here within this image) then I set a marker for 910.525MHz, they are offset from each other?

Well, it was easier to implement than I thought. And a lot more fun! I need to fine-tune the circles and then think about some sort of frequency annotation or readout. Brian

Very interesting, Maynard. I had pretty much decided to skip implementing a Smith chart until I read your response. I'm all for facilitating insight. I never worked in RF professionally. The Smith

Bob, I have gone through that some time ago. It is quite useful, though not exhaustive. 73 Jon, VU2JO <becclest@...> wrote:

Jon, Log into the groups.io nanovna group and go to the Files section. Look for the "Absolute Beginners Guide". I think V6.20 is the last update. It does not cover all the bells and whistles of the

Jim, You are exactly right about the graphical design of a matching network. Some years ago I worked up a network which involved solving a quadratic equation, easily done. So I had an analytic