[Elecraft] K3: Unable to update firmware by RS-232 port

[Brad Johnson]

Joe,

You mentioned that  you recently performed several upgrades/ 
enhancements including the Remote I/O upgrade.

Was one of the enhancements "Improving the Immunity of the rear panel  
RS232 and audio connectors to RF." And if so, did you bypass L1 (RS232  
ground return) on the Remote I/O module?

The reason I ask is that I performed some of the same enhancements  
over the weekend but was reluctant to bypass  L1 as I wasn't sure if  
that enhancement pertained to the Revision B remote I/O board which I  
had just installed. I was concerned that bypassing L1 on the new board  
might cause a problem.

I was going to post the question here or to support but decided to  
wait and determine if RFI through the RS232 connector was an issue.

Just a thought...

Brad
AA5CH