|Radio and Electronics (DED Philippinen, 66 p.)|
|2. PRINCIPLES OF RADIO COMMUNICATION UNICATION|
The basical idea of the term COMMUNICATION is: to transfer an idea (a SIGNAL) from one from one brain of a human being (a SIGNAL-SOURCE) to the brain of another human being (a RECEIVER).
The normal way of communication is of course to speak with each other. But which TECHNOLOGY is used during speaking? Obviously, the idea is translated into words.
The words are produced in terms of voice (or SOUND). This sound in physical sense of the word is nothing else than a special sequence of airpressures. These airpressures will cause vibrations everywhere.
They will hit the inner ear of the receiver and will be retranslated in his brain into the original idea. This normal way of communication is no more possible if the distance between the signalsource and the receiver will make it impossible to understand each other anymore. While the past human beings found different possibilities to overcome this problem.