Oms, That is called ESSB mode and requires the 6 kHz filter. See the menu item CONFIG: TX ESSB in the manual. K4 Utility makes the filter setup easy. 73, Don W3FPR py5eg wrote: > Hi Gary: > I would like to know the procedures to transmit with K3 SSB with bandwith more than 2,8 Khz > Thanks in advance > Oms PY5EG > >