- Crystal Radio Supply
- Displays list of Crystal radio kits, parts and supplies for sale, with information on ordering, shipping, and return policy.
- Harry's Homebrew Homepage
- Presents collection of receiver, antenna and peripheral homebrew projects for the radio and DX enthusiasts.
- JPS Communications, Inc.
- Provides DSP equipment for military, short wave and ham radio applications. Includes highlights on new products and recent news releases.
- WD8DAS Sync Page
- Contains list of Synchronous Detector information and reviews.
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