This page collects some simple tools to calculate

• the noise temperature from the noise figure and vice-versa
• the noise figure of 2 stages in cascade (Friis Formula)
• the output intercept point of 2 stages on cascade (OIP3)
• the basic performance of a 3 stage receiver - noise figure, gain, intercept point

and other simple formulae that may become handy sooner or later.

This is an on-going effort, so visit this page on a regular basis to check out the latest additions.