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K3S (and K3) 2.1 kHz Roofing Filter,  Factory Installed.*

There are 5 filter positions per K3S and per KRX3A. The 2.7 (or 2.8) kHz SSB filter uses one of these positions.

On SSB the K3S must transmit through the widest standard SSB filter (either 2.7 or 2.8 kHz). (You may receive on any filter.) All K3S radios must have at least a 2.7 or 2.8 kHz SSB filter installed. (2.7 kHz is included with the base K3S.) For ESSB mode, TX can be set to use the 6 kHz or 15 kHz filters (if installed) and b/w can then be set by the DSP.