Mode changing
To change modes using the Elecraft K2 and K3 you must cycle through the available modes. KComm provides a set of instant band change buttons that allow you to instantly select the mode you wish to use.
Some of the mode buttons may be disabled depending on the modes supported by the Elecraft transceiver. However, KComm assumes that all the possible modes are available, so if you have a K3 the FM button will be enabled even if you have not installed the FM filter.
The data modes available will depend on how the data modes are generated. If you are operating under Windows and using the PSK Core DLL then PSK31 and PSK63 will be available. RTTY will not be available because the DLL does not support it.
If you are using an Elecraft K3 and are not using the PSK Core DLL then RTTY and PSK31 will be available but not PSK63, because the K3 does not natively support PSK63 encoding or decoding.