I had been using an Elecraft USB/serial cable with my recently acquired K2 and the PC communications worked properly. In debugging a software problem, it was suggested that I try using a real serial port, which I did. Unfortunately, I was unaware that I wasn't supposed to use a standard RS232 cable. So now, the K2's port won't work with the USB/serial cable either and I assume that the interface in the KPA-100 was damaged. I guess that U4 (MAX 1406) is a prime suspect for failure in this case. Any suggestions?
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