[Elecraft] [K3] FT4/8 Transmit Problem

[john]

Had a transmit problem with both FT4 and FT8 this weekend during the 
RTTY RU contest. The data would transmit for a couple seconds (heard it 
in the monitor, and saw output power), then the data stops. The K3 stays 
in transmit (Red TX light) for the whole TX period, so I think the PTT 
configuration is working. I was using it in conjunction with N1MM, but 
closed N1MM and used WSJTx standalone, and had the same problem. 
Appreciate any ideas.
   - 73, John, N0TA