For a nice simple, how it works in layman's terms, go here:

http://williamson-labs.com/

Lots of other good stuff, including ham radio are to be found at the above.

For a simple, but math intense (algebra only needed), go here:

http://www.ee.umd.edu/~bassel/man/

This is a college lab series, but is very good for someone who wants to be self-taught or needs to brush up on old skills.

Enjoy,

George Avera


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