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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 site with an emphasis on VHF, power amplifiers and Russian tubes