Radio engineering and RF/microwave                                                                    Home

I've started this page to share my work and ham radio projects or ideas. Updating the page has proven to be more time consuming than building the circuits.
So, I have began to add here the easiest parts firstly.

Let's start with simple things...

- An impressive site about crystal receiver sets.


My list of (free) TOOLS that could support our hobby...

FREE! Mainly for Linux, but also available for Windows, the Quite Universal Circuit Simulator, QUCS, is a free software aiming to support all kinds of circuit simulation types, e.g. DC, AC, transient, S-parameter, Harmonic Balance analysis, noise analysis, etc.  It produces results and looks similar with Agilent ADS. For a RF or microwave designer is one of the best FREE tools available. QUCS can work in conjunction with ASCO (A SPICE Circuit Optimizer) which uses a high-performance parallel differential evolution (DE) optimization algorithm. These programs are created by the Qucs and ASCO teams at

FREE! Linux transcalc is an analysis and synthesis tool for calculating the electrical and physical properties of different kinds of RF and microwave transmission lines.

FREE! Linux/Windows Kicad is an open source (GPL) software for the creation of the electronic schematic diagrams and printed circuit boards.

FREE! Linux linSmith is a Smith Charting program, mainly designed for educational use.

FREE! Linux/Windows ViPEC schematics+simulator+....  tool distributed under the GNU General Public License, an open source license.

FREE! The Agilent AppCAD v.3.0.2 RF design tool

FREE! The Agilent TLF (Transmission Line Fundamentals) learning tool. This is a package which explains standing wave ratios, reflections, impedance matching, etc.

FREE! Windows/Linux  HbFree  (including source code) for harmonic simulation of RF/microwave analog circuits.

FREE! Windows/Linux SPICE OPUS developed initially at University of Ljubljana. There is a new version (2009) available for download. You may be interested to look for the book published in 2009 having the title "Circuit Simulation with SPICE OPUS".


always under construction...