Guide to Spectrum and Signal Analysis

Guide to Spectrum and Signal Analysis
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Guide to Spectrum and Signal Analysis

  • www.anritsu.com | 25Now consider Figure 29. This shows an over-modulated 100 MHz carrier with fm = 1 kHz. From the time domain display (Figure 30) we can see that the carrier is cut off when the modulation frequency is at a minimum. From the corresponding frequency domain display, the first sideband pair are 6 dB lower than the carrier hence %M = 100% but note also the severe harmonic distortion products.These distortion products effectively increase the occupied bandwidth unnecessarily.Figure 29Figure 30