Chapter 4 Building Simple Test Oscillators and Modulators
Before any of the radios are presented, it would be preferable to build some simple test equipment. This chapter introduces the amplitude modulated (AM) signal and various ways to generate radio-frequency (RF) and intermediate-frequency (IF) signals for testing radio projects.
The Continuous-Wave Signal
A continuous-wave signal is defined by a fixed amplitude and a fixed frequency. In an audio continuous-wave signal, this is better known as a tone.
The simplest continuous waveform is a sine-wave signal such as seen in Figure 4-1. The sine-wave signal may represent an RF signal.
FIGURE 4-1 ...
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