Gary, If you are thinking of the DSP processing, that is done at 15kHz. The audio response can be from 50Hz to 4000Hz and depends on the setting of the shift/width or HiCut/LoCut. 73, Don W3FPR On 3/21/2016 5:52 AM, Gary wrote: > Anyone confirm the k3 has audio IF of 1.5khz? >