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a Windows® electrical filter design and analysis program handling all of the usual options (family, topology, bandwidth, etc.). It has a nice toolbox including real-time tuning modes and optimization. Outputs are presentation quality. Student edition is free. |
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a Windows® electrical filter design and analysis program designed to expedite the design of lowpass and highpass filters using Standard Value Components (nearest-5% values). Free. |
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a Windows® meterscale drawing program to allow you to design and print professional-quality meter scales on your printer. Nice options include the ability to import a graphic (and resize and place it where you want), make a modern-looking "flattened" scale, use seriff or sans-serif fonts of any size and specify the scale colors. Trial version is free. |
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a Windows® program to help you design and analyze helical-resonator bandpass filters, usually used in the VHF and UHF frequency ranges. Free. |
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a Windows® program to allow you to design and analyze diplexing networks using either the highpass/lowpass or the bandpass/bandstop topology. Free. |
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a Windows® program to allow you to design and analyze PI-L matching networks. Free. |
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an interactive Windows® program to allow you to design RF amplifiers using the single-ended topology. Free. |
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a Windows® program which allows you to enter the values of an ordinary matching/network adjusted to match a reactive load to a specified system impedance. It then returns the load's R and jX values. All eight of the usual two- and three-element topologies are accommodated. Free. |
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an interactive Windows® program to allow you to design and analyze the active networks used for single-sideband signal generation. Accepts orders from two to ten, specified operating frequency range and analysis frequency range. Reveals sideband suppression, chain angles and angle differences. The program has a component-tuning mode. Arbitrary components may be used, or nearest 1% or 5% values and results seen. Writes Spice file. Free. |
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This Windows® program allows you to print both great-circle (polar) and rectangular projections of maps of the world. Polar is as seen from a specified home location. Also shows the azimuth and distance to a specified target. Easy to enter new home or target locations. Shows/uses Maidenhead strings. Free. |
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This Windows® program allows you to see a map of North America and see the patterns of AM radio stations on a specified frequency. Scaleable mapsize and patternsize, specified map center, hardcopy, easy restart (setup is saved). Free. |
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This Windows® program allows you to see the values of R and jX looking into the base of a vertical antenna over a good ground. Although the program is based on an ideal ground and a cylindrical metallic tower, it has proven very useful in the real world. Inputs are the tower height and diameter and the analysis frequency range. Output is a plot of R, jX and Z as a function of frequency. Log or linear sweep, output to a printer as well as screen. Free. |
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This Windows® program allows you to manipulate network components as if you were doing it on a printed Smith Chart but is designed to be much more intuitive and user-friendly. Inputs are the operating frequency, the R and jX value for the load and the network components, up to eight. Various network topologies may be entered and tuned. Outputs are the usual collection of Smith Charts. This program is under development and suggestions are welcome. Free. |
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A small collection of application notes and discussions |
