Slideshow presented at AfNOG 2009 in Cairo, Egypt.
It is a very quick introduction to the physical basis of telecommunications, many concepts are briefly introduced, like i.e.: e.m. waves (amplitude, frequency, ...), RF signals (power, modulation, ...), power measurement, spectrum analysis, dB (math, examples, Alexander Bell).
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).
