At 08:43 AM 16 02 2009, W0MU Mike Fatchett wrote: >To key cw you will need some type of keying circuitry. You CAN key the K3 using RS-232 command without a keying interface. See page 18 of the manual. 73, Hank, W6SX Mammoth Lakes, California Elevation 8083 feet in John Muir's Range of Light