|Radio and Electronics (DED Philippinen, 66 p.)|
|2. PRINCIPLES OF RADIO COMMUNICATION UNICATION|
We agreed already: the AIM OF COMMUNICATION is to transport the IDEA (the SIGNAL) totally correctly from the ORIGIN (the TRANSMITTER) to the ADDRESS (the RECEIVER).
But it is easy to imagine, that even in the original way of communication (speaking with each other) very often the idea was not received properly.
As the possibilities of arising faults are increasing with increasing complexity of the system in use, it is easy to understand, that radio technology is mainly a struggle to get a good or at least a satisfying RECEPTION.
The quality of the equivalence of the signal at the start of the communication (INPUT fig. 7a) and the signal at the end of the communicationline (OUTPUT fig 7b or 7c) is called FIDELITY.
The rate of difference between INPUT and OUTPUT is called DISTORTION.