Japanese WW2 sonars operated at a range of frequencies. The Type 91, with 30 inch quartz projector, worked at 9 kHz. The Type 93, with smaller quartz projectors, operated at 17.5 kHz (model 5 at 16 or 19 kHz magnetostrictive) at powers between 1.7 and 2.5 kilowatts, with range of up to 6 km. The later Type 3, with German-design magnetostrictive transducers, operated at 13, 14.5, 16, or 20 kHz (by model), using twin transducers (except model 1 which had three single ones), at 0.2 to 2.5 kilowatts. The simple type used 14.5 kHz magnetostrictive transducers at 0.25 kW, driven by capacitive discharge instead of oscillators, with range up to 2.5 km.
japanese ww2 sonars operated at a range of frequencies the type 91 with 30 inch quartz projector worked at 9 khz the type 93 with smaller quartz projectors operated at 175 khz (model 5 at 16 or 19 khz magnetostrictive) at powers between 17 and 25 kilowatts with range of up to 6 km the later type 3 with german-design magnetostrictive transducers operated at 13 145 16 or 20 khz (by model) using twin transducers (except model 1 which had three single ones) at 02 to 25 kilowatts the simple type used 145 khz magnetostrictive transducers at 025 kw driven by capacitive discharge instead of oscillators with range up to 25 km