COMMERCIAL IN CONFIDENCE

Gram 1 — Tonal Analysis

Gram 1 spectrogram
time-start0
time-end40
freq-start100
freq-end300
Question Identify the fundamental and any harmonics present in the tonal at approximately 180 Hz.
Theory A propeller-driven contact radiates a fundamental tonal with a series of harmonics. Use the harmonics mode to overlay the harmonic series and confirm the spacing.