Figure 2-6.
A simple CW transmitter.
(a) The continuous wave is used for the transmission of telegraph
signals.
Information is given to the carrier by starting and
stopping the carrier with a switch or key. Keying is done in code,
such as the international Morse code.
(b) The switch is closed for a short period of time, representing a dot.
Closing the key for a longer period of time represents a dash. The
Morse code is composed of dots and dashes representing the various
letters and numbers of the alphabet and numeric system.
(2) A more powerful transmitter can be seen in figure 2-7.
This
transmitter has a more stable frequency.
The frequency is stabilized
by keying the amplifier instead of the oscillator.
Figure 2-7.
An improved CW transmitter.
309 L2
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