This slideshow was presented at AfNOG 2009, in Cairo (Egypt).
It is a brief introduction to radiopropagation (behavior of radiowaves, effects of the environment, line of sight, Fresnel zone) and to link budget calculation (link planning, power budget, sensitivity and gain, losses, software tools).
It is provided in both Adobe PDF format and Apple Keynote original source.
This presentation is on dB math (why do we use dBs?, examples of calculations with dBs, etc) and on Link Budget Calculation (how far can a wireless link go?, what gain should my antenna have, etc).