This chapter gives the reasons. It begins by raising the fundamental question of exactly what is meant by the spectrum of a signal. This, as you'll see, is actually the crux of the matter. The chapter then explains the spectrum of a pulsed signal in two quite different ways: first, in terms of a conceptually simple but powerful analytical tool, called the Fourier series, and second, in terms of what physically takes place when a radio frequency signal passes through a lossless narrowband filter. For those readers who have some familiarity with calculus, the essence of both explanations is presented in more precise, mathematical terms - the Fourier transform - at the end of the chapter.
Mysteries of Pulsed Spectrum Unveiled, Page 1 of 2
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