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 that fall out of a computer or calculator where the Smith chart might make one think "That ain't right!"
I still use slide rules for pretty much the same reasons. Although I am thankful that I don't have to work my way manually through hyperbolic functions of complex argument as I did early in my career when no calculators or computers were readily available.
73,
Maynard
W6PAP
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On 4/27/25 14:45, W0LEV via groups.io wrote:
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 publication which introduced the world to the Smith Chart. I
offered the engineer who owned it $200 on the spot. He refused. I upped
my offer to $300 on the spot. He again refused. He also refused my $400
offer. I gave up. At least I got to actually handle and leaf through it!
Now I have the time in retirement, but no $$ for "frivolous" things like
that.....
As an EMC/RFI/RF design engineer and spending a good amount of my
professional life as well as on the hobbies designing, building, and
matching antennas and any number of RF/?W circuits, the Smith Chart will go
to my grave with my decaying body......
Dave - W?LEV
On Sun, Apr 27, 2025 at 9:30?PM Team-SIM SIM-Mode via groups.io <sim31_team=
[email protected]> wrote:
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 lay in simplifying the
plotting process on paper using just a compass to draw the impedance circle
based on the electrical length of the line, resulting in a neat circle
centered on the chart's origin. With the NanoVNA, this also produces a
clean circle around the center, but by varying the stimulus frequency.?
This method has allowed me to measure the characteristic impedance of
coaxial cables precisely and reliably at a given frequency by centering the
impedance circle on the chart's origin. This is achieved by adjusting the
normalization impedance using the feature provided in DiSlord firmware
version 1.2.40.
No other graphical method offers such performance and ease for measuring
characteristic impedance (Zc) with this level of elegance and precision. It
truly is the 'magic circle' of the Smith chart.?
73s Nizar
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