Hi,
The scale is neither linear nor logarithmic, and I¡¯m not sure what it is.
Luckily it does not matter if you just want to use the smith chart.
Generally for radio work the centre is defined as 50 ohm; that is a resistance of 50 ohms would be plotted at the centre of the chart, a resistance of 100 ohms would be plotted at the 2.0 position.
The rule is divide whatever the impedance is by 50 and plot the new figure on the chart. Conversely to get a value from the chart take the reading from the chart and multiply by 50 to get the actual values.
It seems complicated but a bit of practice will make it easier.
Good luck
73
John
M0JBA
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On 25 Mar 2020, at 15:05, vaclav_sal via Groups.Io <vaclav_sal@...> wrote:
An off - topic question to any math wiz knowledgeable about Smith chart.
There are oodles of stuff about Smith chart, but I have not be able to find
WHAT is the actual scale of the coordinates.
For example
real axis ( R +j0) goes from "zero" (left) to center of the chart - MOST of the time
designated as "one" .
Therefore - what is the scale between 0 and 1 - linear or log?
( No need to discuss log(0))
It PROBABLY makes no difference, but IMHO log scale would "loose" some visual
precision.
Please, no sermons / references about what is Smith chart , how to use it etc.
Sorry to post here , but I have limited choice.
