Mr. Smith Help English version

Translated by KANAYA Hidenori, Jan. 3, 2010

    This is a translation of 'Mr. Smith Help version 2.03 April 30, 1996'. I added some comments and pictures concerning Japanese font issues.

    I assume no liability or responsibility for errors, omissions or ambiguities in this document. Under no circumstances, I am liable for any damages whatever arising out of your use of this document, including direct, indirect, incidental, consequential or punitive damages.

Start of Document

I am glad that you use Mr. Smith.
Mr. Smith is a calculator on the Smith Chart running on PC. I made this software in order to make RF engineers free from a compass and paper-form Smith Chart.
Mr. Smith would let you be familiar with the Smith Chart because it calculates reactance and complex number automatically.


[The Window]
[Program] Menu
[Marker] Menu
[Rotate] Menu
[Circle] Menu
[Option] Menu
[Print] Menu

[The Window]


Operating Conditions

You enter an operating condition of calculation here. You click the portion you want to change. Then the cursor appears. You enter a number with a prefix (G,M,k,m,u,n,p) and push the enter-key. You must push the enter-key after changing a parameter here.

  • frequency: frequency in which Mr. Smith calculates impedance.
  • Zo: Normalized Impedance
  • Mouse Position

    This number indicates the impedance of the cursor point. If you want to add a cursor point to a marker, click any button of the mouse. Then a confirmation window appears. This asks you whether you add this point to Marker List. The left button is 'OK' and the right button is 'Cancel'.

    confirmation dialogue


  • Active Marker / List
  • The list indicates all markers on the chart. The Active Marker is the target to calculate. You can change Active Marker to other markers by clicking a marker entry in the marker list.

  • Marker Type
  • You can select a display format of the Active Marker from impedance, admittance, reflection coefficient or SWR/ Phase.

    *The angle symbol goes wrong in English language environment. Ohm letter and 'j' may go wrong, too.

    [Program] Menu

  • [Clear]
  • You can clear the chart. All markers, circles and cursors are cleared.

  • [Quit]
  • Mr. Smith closes.

    [Marker] Menu

    It puts or erases a marker on the chart You can put a marker with 3 types of format, Impedance (R+jX), admittance (G+jB) and reflection coefficient (mag and angle).
    You can enter a marker by clicking cursor point on the chart. You have to enter the first marker to start calculation.

    [Rotate] Menu

    It calculates impedance shift from the Active marker by connection of R, C, L or transmission line. The calculation result-impedance destination is added to the marker list and plotted on the chart. The units of value of L and C are Henry and Farad respectively.
    You can set the characteristic impedance of a transmission line in spite of Normalized Impedance setting in the Operating Conditions window.
    You can set the length of a transmission line with a physical length (electric permittivity=1), electric length or phase angle.

    [Circle] Menu

    You can put or erase a circle that contacts the Active marker. You can put a constant reactance line, a constant resistance circle, a constant conductance circle, a constant susceptance line or a constant SWR circle.

    [Option] Menu

    You can choose the chart type from the impedance chart, the admittance chart or the immittance chart. You can set SWR cursor and Q cursor here.

    [Print] Menu

    Print Menu immediately starts to print the chart and all markers in your default printer.


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