Spectrum of Pulsed Signal
Transmitting a radio frequency signal in pulses markedly changes in the signal's spectrum, as observed by the tuned circuit of a receiver. Whereas the spectrum of a continuous wave of constant wavelength consists of a single line, the spectrum of a single pulse of the same wavelength covers a band of frequencies and has a sin x/x shape. The width of the central lobe of this spectrum varies inversely with pulse width. If the pulses are as narrow as those used in many radars, the central lobe may be several megahertz wide.
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