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Antenna Calculations
A set of on-line forms that let you enter your requirements and then calculates antenna dimensions and other factors. Also offers links to other tips and activities.
Oatbox Crystal Set Project
On this page you will find complete plans for Phil's Quaker Oats box set. Also contains information on The Xtal Society, who publishes a newsletter about crystal radio, crystal set projects, tips for crystal radio design, and crystal radio / antique radio history. [Younger teens and children should be supervised for this project.]
WT9W
Information includes tips on winding toroids, desoldering, and general kit building.