This links from page contains some of the constants and equations that are commonly used in radiocommunications work. I can't always remember them so having them on a web page is useful to me and hopefully to others too. As a result, please let me know about anything useful that is missing.

Under construction.

1. Useful Physical Constants
2. Unit Conversions
3. Radio Systems Equations

Being topical, 6 x 9 = 42