fig6 were printed with a burst 22 that filled u2153 of the period 23 the burst included 5 pulses with a variable operating frequency the first 4 pulses in this example are identical and the last is 50 longer the final pulse does not have to be larger but was found to be beneficial in assisting with drop break off in each image of fig6 the operational frequency is doubled doubling the frequency cuts the widths of the pulses within the burst in half constant percent duty however the total energy is maintained because there are now twice as many busts within the same time frame fig6 is important in highlighting the effectiveness of the bust sequence at 133 hz groups of 4 drops are generated for each burst successive doubling of the frequency to 266 and again to 533 reduces the number to two and finally one drop per period respectively the length of the period distance between a single drops or the distance between repeating groups of drops for the case of multiple drops generated is also cut in half for each doubling of the frequency the print volume is roughly constant this is primarily controlled by the pack pressure constant feed rate of material in all cases multiple waveforms within a single burst are needed to generate a print drop drop spacing was determined by the rotation speed of the drum 32 to which the print media was attached fig7 shows.