Here is a technical overview of the Software radio approach to satcom.
http://static1.1.sqspcdn.com/static/f/679473/20514128/134930...
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http://static1.1.sqspcdn.com/static/f/679473/20514128/134930...
I make user-friendly RF analog electronics:
http://www.ebay.com/sch/iseeabluewhale/m.html?_nkw=&_armrs=1...