On 12/23/2018 3:22 AM, IK4EWX wrote: > Why Elecraft doesnt produce a 700hz filter for cw ragchewing? Because IF filtering is done in DSP, so any desired bandwidth can be set by the knobs on the front panel. The added crystal filter(s) are roofing filters, and simply protect the DSP from strong signals outside the passband. 73, Jim K9YC