The harmonic interval : fact or artifact in spectral analysis of pulse trains
Watkins, William A.
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The harmonic interval indicated during spectrographic analysis of a rapid train of pulses may be used to determine the pulse repetition-rate. If the pulse rate is regular, but too rapid to be separated, the repetition-rate may or may not be represented on such analysis as a line at the repetition frequency, but will always be indicated by the separation between harmonic bands, the harmonic interval.
Originally issued as Reference No. 68-13