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PRINCIPLES OF RADIO COMMUNICATIONS
Developing an understanding of radio communications begins with the
comprehension of basic electromagnetic radiation.
Radio waves belong to the electromagnetic radiation family, which includes
x-ray, ultraviolet, and visible light — forms of energy we use every day. Much
like the gentle waves that form when a stone is tossed into a still lake, radio
signals radiate outward, or propagate, from a transmitting antenna.
However, unlike water waves, radio waves propagate at the speed of light.
Radio wave amplitude, or strength, can be visualized as its height —
the distance between its peak and its lowest point. Amplitude, which is
measured in volts, is usually expressed in terms of an average value called
root-mean-square, or RMS.