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A MODULATED SINE WAVE IS NOT A SINE WAVE. INSTEAD IT IS THE
SUM OF THE CARRIER AND OTHER SINE WAVES OF SLIGHTLY
GREATER AND LOWER FREQUENCIES.
- EVEN THOUGH ONE USES A CARRIER WITH A GIVEN FREQUENCY, F,
THE TRANSMITTED SIGNAL WILL INCLUDE MANY DIFFERENT FREQUENCY
COMPONENTS.
- THE RANGE OF FREQUENCIES ACTUALLY USED IS CALLED THE BANDWIDTH OF
THE SIGNAL.
WHEN FREQUENCY DIVISION MULTIPLEXING IS USED, THE CARRIER FREQUENCIES
MUST BE FAR ENOUGH APART SO THAT THE THE BANDWIDTHS OF THE ACTUAL
SIGNALS DO NOT OVERLAP.
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