Tonne Software

The Windows ® program to mechanize Smith Chart operations

The current revision is now 2.12

This graphics-intensive program is a transmission-line calculator for both advanced and beginning users. Based on the venerable Smith chart, it provides high-accuracy computations without recourse to paper, compass or straightedge.
Here are the highlights of this program:

JJSmith is 32-bit Windows® program written to help engineers design and analyze networks using the Smith Chart. The standard interface makes all of the operations in the progam easy to use. Numerous options are available at a button press.

Uses the full graphics capabilities of the Windows ® operating system for network entry, analysis controls and displayed results. The chart can be zoomed in on or panned to closely examine any area of special interest.

On the Design page you can select components for your network from the library of parts and easily edit their values. Then on the Analysis page you can "tune" those parts' values and immediately see the results on the chart.

Analyzes networks composed of transmission lines, stubs and lumped components (L's, C's and R's) in both series-connected and shunt-connected configurations.

With revision 2.11, negative values for inductors can be entered for impedance-matching networks.

The network under examination can be stored on the hard drive for later retrieval. These files are in ordinary text format.

Analysis results are displayed over impedance or admittance coordinates or over readily-apprehended overlays of both.

Numeric readout of any point on the chart in terms of impedance, admittance, complex reflection coefficient, VSWR and return loss is available at any time with a mouse click.

In addition to displaying the results of sweeping the operating frequency, those results are also available in tabular form for input to other analysis and synthesis programs.

As an aid to designing impedance-matching networks, a constant-VSWR circle and constant-Q curves may be displayed.

The outputs to the printer are not "screen dumps" but instead are from a separate set of dedicated routines which write directly to the printer. The quality of the graphics as delivered by the printer will be limited only by that printer.

The screens automatically adjust themselves to various resolution screens. Aspect ratio of the screen display can be adjusted so the Chart looks circular on any monitor size or width-to-height ratio.

Here are some screen dumps of the program:

Design page:
Design page

Analysis page:
Analysis page

Analysis - zoomed in:
Zoomed in, with VSWR circle and several test frequency points