The Principle of operation of DF (Direction Finder)

Build your own DF

Another DF that have option to use the PC and soundcard for Processing

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An Explain of what is Software defined radio

The SoftRock40 Group SDR Project Info page

Excelent SDR Tutorial

Iono Sounding Explain

Excelent Site for lot of Electronics and RF Explain

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Filter explain

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spectrum monitoring deal with spectrum monitoring

A huge antenna Info resources

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Radio Electronics have lot of info on Radio and Electronics

EEM Provide Huge info on lot of Manufactures

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Another good one

FreeScale (now NXP) Semiconductor poduct info

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