This Windows® program expedites the design and analysis of active
bandpass filters. Analysis of magnitude, phase and delay is
integral to the program.
This Windows® program expedites the design and analysis of active
lowpass filters. Analysis of magnitude, phase and delay is
integral to the program. Interesting transient response and Monte Carlo gain plotting routines
as well as an optimizer based on entered limits.
Odd-order filters do not need a separate single-pole opamp.
3 OCT 2021
This Windows® program expedites the design of impedance-matching networks.
Numerous options are available.
21 FEB 2022
This Windows® program expedites the selection of colors used when
writing code for a graph for plotting data on your computer or setting the
colors on an LTspice waveform screen. Designed especially
for Visual Basic programmers and LTspice users. Uncommonly flexible and easy to use.
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.
Get the 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.
This program allows you to see the values of R and jX looking into the base of a vertical antenna over an ideal ground.
Although the program is based on that 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.
This hobbyist program allows you to plot the patterns of North American AM radio stations. Now a "freebie." No longer
updated but database is simple text so user can update it themselves.
Download the tube curves program based on the Koren parameters. Writes LTspice files.
Download the program to design stepped volume controls. The program also analyzes the resultant design.
This paper discusses the pulse-width modulator in great detail. Schematics
and waveforms from Elsie and LTspice analyses clarify the text. Related items are also
discussed. Be advised this document is over 9 megabytes in size.
27 AUG 2021
Download the article about Speech processing as submitted to QEX. Explains preamplification, response shaping,
simple but high-performance compression, and clipper with non-overshooting lowpass filtering.
Download the speech-processing article as published in QEX, Sep-Oct 2018 issue. This is courtesy ARRL and posting
here is allowed because I am the author.
Download the article about CW bandpass filters as submitted to QEX. Reveals why "rounded top" bandpass filters are
best for CW reception.
Download the article about CW bandpass filters as published in QEX, Mar-Apr 2017 issue. This is courtesy ARRL and
posting here is allowed because I am the author.
Download the article about Allpass Networks used in a speech chain as submitted to QEX. Passive and active
networks are discussed in detail.
Download the all-pass article as published in QEX, Nov-Dec 2017 issue. This is courtesy ARRL and posting here is
allowed because I am the author.
Download the talk about Speech Processing as given to the Oak Ridge Tennessee Amateur Radio Club.
Download the tutorial about electrical filters. This is the talk given to the Oak Ridge Tennessee Amateur Radio Club
about filters. Starts with the basics.
This is the paper on AM demodulators, with an emphasis on the diode type, pointing out the deficiencies
commonly encountered.
