RF Engineering
What Is Fade Margin and How Much Do You Need?
Fade margin is the number of decibels by which the received signal sits above the receiver's usable threshold, the reserve a radio link holds to ride out multipath, rain and atmospheric fading without dropping out. This guide gives the formula, a worked example, the link between fade margin and availability, why each extra nine of uptime costs about 10 dB in the multipath regime, how rain rewrites the rules above 10 GHz, how much margin Australian paths actually need, and the practical ways to buy more of it.