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Neets Module 12-Modulation Principles | Next
Figure 1-22A.—Essential elements of ON-OFF keying. |
1-27
during which signal is present is called the MARKING interval, and the period of no signal is called the
SPACING interval. Figure 1-22 shows the relationships between the rf carrier view (A), the on-off keying
waveform view (B), and the resultant carrier wave view (C).
Figure 1-20.—International Morse code.
Figure 1-21.—Dot and dash in radiotelegraph code.
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