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This document provides, in a condensed form, the absolute basics of communications physics. It is derived from a course I used to teach to undergraduate students of communications; although this was some years back, the principles are still valid.
A warning: it is sometimes said that `an ounce of simplification is worth a pound of explanation'. In the interests of simplification, in this document I will make some statements that are not absolutely, 100% true. Or at least not true all the time. This is just to avoid the need for lengthy explanations. It should not cause problems for anyone involved in typical applications of computing and communications, but may cause offence to physicists. Of course, professional physicists have no reason to be reading this, so I'm not all that worried.
Basic electrical theory and physics for communications: units and measurements Basic electrical theory and physics for communications: signals Basic electrical theory and physics for communications: light Basic electrical theory and physics for communications: electricityBasic electrical theory and physics for communications: radio and microwaves
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