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

A fascinating site with downloadable info on vintage radios, based in the U.K.

Extensive info on GPS frequency standards, 6-meter amplifier and filter, other amateur radio items.

An antenna analysis program

A well-established antenna analysis program

A site featuring a simplified-interface Windows version of NEC2

U. K. Microwave Group - software and links page

A concise listing of computer-aided engineering links

A serious amateur radio site with an emphasis on power amplifiers and Russian tubes