Input length is 21 inches
For 2nd harmonic, RPM range is from 5594 to 6789 with a pulse strength of 10 percent
For 3rd harmonic, RPM range is from 4203 to 4804 with a pulse strength of 7 percent
For 4th harmonic, RPM range is from 3277 to 3665 with a pulse strength of 4 percent