If you are using MMTTY make sure that you have the "EXTFSK" patch set up in both the TX setup window and the Misc window. I get tripped up on this every once in a while. If these settings are correct you probably have a physical problem with the FSK keying lead between the interface and the K3. You can check the radio by grounding pin 1 of the ACC (DB15) connector. The tone will shift when grounded.

Good luck
Ed
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