This website offers a collection of on-line RF tools.
The tools are collected from all over the web.

RF Calculator

Conversion from and to various RF units

Intermodulation

Calculate intermodulation for 2 and 3 frequency's up to the 9th order.

Other on-line calculators

There are more calculators on the world wide web than the ones on this website.
More calculators and the source scripts can be found at:

• http://www.qsl.net/n9zia/wireless/page09.html