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Papers, Programs & Stuff




Papers


Get the paper about allpass networks used to improve speech amplifiers.
860 kb PDF; updated 4 January 2017.

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. Seriously upgraded 6 December 2012 with considerable new material and graphics. This is a 3 MB PDF file.

This paper (PDF) discusses pulse-width modulation with an emphasis on the post-switch lowpass filter.


This paper outlines the steps taken to design an unusually-effective "speech amplifier" for ham radio use.


Photo documentary of the rebuild of a Collins 180S-1 tuning unit

Programs


Download the program for the hobbyist which shows the patterns for AM broadcast stations in the Americas.


Download a program which can be used to quickly design the RF lowpass filter used in the BITX (or other transceivers that have 50-ohm filters).


Download the program which can assist in setting the component values for the BITX transceiver VFO.


Download a PDF (320 KB) file which illustrates how the BITX VFO tuning program functions.


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.


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.

Stuff

ARC-5 Manual 29.2 MB PDF
ART-13 Transmitter Manual (1949) 17.4 MB PDF
ART-13 Transmitter Manual (1954) 38 MB PDF
Collins 26W Limiter Manual 3.6 MB PDF
Raytheon RA-1000 Transmitter Manual 44.5 MB PDF