Input length is 18 inches
For 2nd harmonic, RPM range is from 6527 to 7920 with a pulse strength of 10 percent
For 3rd harmonic, RPM range is from 4904 to 5604 with a pulse strength of 7 percent
For 4th harmonic, RPM range is from 3823 to 4276 with a pulse strength of 4 percent