Reference

Data Sheet Archive (http://www.datasheetarchive.com/)

AC6V's Reference pages (http://www.ac6v.com/)

Navy Electricity and Electronics Training Series (http://www.hnsa.org/doc/#neets)

NIST Time and Frequency Division (http://www.nist.gov/physlab/div847/)

ePanorama (http://www.epanorama.net/index.php)

All About Circuits (http://www.allaboutcircuits.com/)

Discover Circuits (http://www.discovercircuits.com/index.htm)

Radio-related calculators (http://www.66pacific.com/calculators/default.aspx)