Interactive RF Circuit Analysis

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The quickest way to understand SimSmith's capabilities is to view an introductory video.
(Sorry about the sound quality.)

Move videos can be seen at =>
and more movies at the sites below

SimSmith was written in Java using the Eclipse IDE.   Packaging and profiling utitlities are provided by ej-technologies.                          

SimSmith Is An Evolving Program.

This means that over time, basic operation can change.  Changes are made for a variety of reasons: adding functionality, fixing bugs, making things 'consistent' across subsystems, making things 'intuitive' for the user, meeting industry standards and/or expectations, etc.

These changes can cause considerable angst, particularly when attempting to follow along while watching a video.  If you run into this problem I appologize. Please access the help menu, refering to the 'SimSmith' manual, the 'recent changes', or the 'release notes'.  I try to at least say that something has changed and occasionally say why.

SimSmith distributions are available from folders in my dropbox.  Each distribution contains installation packages for Windows, MAC, or Linux as well as the basic '.jar' file executable.  After installation, all manuals and release notes are available from within SimSmith starting at 'help' pulldown menu item.  Additionaly, each dropbox folder contains a 'pdfs' subdirectory which also contains the up to date manuals as well as legacy manuals for earlier versions.

A Typical Dropbox Directory is:


the "_Readme.txt" file describes the directory structure.

Version numbers in SimSmith have a 'major' number, a 'minor' number, and a build designation which are lower case letters. A typical verison number would be "16.9 av". I strive to ensure that 'builds' do not change fundamental operation but occasionally I fail.

At present, several versions of SimSmith are available.  If you are following a video and want to use the SimSmith release closest to that used in the video, look at the top of the screen to see the version of SimSmith being used  and then choose between older versions.  The most stable release of my software is SimSmith 18.4.  At this point, only minimalist repairs for catastrophic bugs will be made to SimSmith.  All new features and fixes to minor bugs will be additions to SimNEC.

SimNEC 1.7 (Preferred) Updated NEC2 error reporting.  Enhanced LCMatching element, system libraries, automatic installation of examples directory, more flexible parameter range control,

Legacy SimSmith

18.4   Contains custom element library support, RUSE block switches.

16.9   Useful when following along older videos.

15.1    Useful when following along older videos.

The software is not 'signed' which means OSX and Windows are reluctant to allow you to do the install.  Here are some Installation Videos that show the process.

Again, please also consider joining the SimSmith group at