[Elecraft] K3: Added protection for RS-232 port (summary)

[Jim Brown]

On Tue, 20 Jul 2010 09:38:23 -0800, Edward R Cole wrote:

>The only dc-isolated wiring in my shack is the soundcard audio lines 
>from radios to computers. 

Why are these isolated? They should NOT be. See my tutorials on The Pin 1 
Problem and on simple bonding of every equipment chassis to every other 
chassis, including the computer with big short copper. Once you do that, 
there is no need for isolation, AND if properly bonded to all your other 
grounds, you have a safer installation. 

http://audiosystemsgroup.com/publish.htm

Both your ham gear and your computer have Pin 1 Problems, and Pin 1 
problems are excited by shield current. That shield current results in 
hum, buzz, and RFI (RF in the shack). When you bond the chassis of 
equipment together, you virtually eliminate shield current. 

73, Jim Brown K9YC