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Peripherals and Add-Ons
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Extensive collection of useful receiver, antenna and peripheral homebrew projects, for ham radio and other DX hobbyists.
site exerpt
Harry's Homebrew Homepage Selected visitors submitted circuits SWE A small PDF library is located at: http hem.passagen.se/sm0vpo Unlimited bandwidth, Full site, SWE You can even find the site using the shortcut http come.to/sm0vpo....Information about the DSP-3 which removes noise and other unwanted interference from voice and data communications signals.
http://www.w9gr.com/
JPS Communications is a manufacturer of DSP equipment for military, shortwave and ham radio applications.
http://www.jps.com
Offers information about synchronous detection and retrofit synchronous detectors in kit and finished form.
http://www.qsl.net/wd8das/sync.html