I am not familiar with the acronym "POL" - please edify me. 73, Don W3FPR On 5/22/2015 9:23 PM, Robert Wood wrote: > RTTY & K3 buttons - how do you fare on FSK POL setting? > > M1-4 buttons, FSK POL = 0 > K3 Utility program FSK POL =0 > FSK via ACC port FSK POL=1 >