Figure 1-7. Wave shapes.
(4) AM is used by radiotelephone and teletypewriter transmitters operating in the medium
and high frequency bands. The intelligence of an AM signal exists solely in the sidebands. It is
susceptible to electrical storm interference. You may observe this by tuning in an AM station on your
car radio during a thunderstorm. The interference happens the instant the lightning flashes.
SS0130
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