[Elecraft] RF into K3 via serial port?

[Jim Brown]

On 4/5/2014 5:39 PM, Don Wilhelm wrote:
> It is usually more effective to put the ferrite on the feedline. 

A choke on the feedline at the feedpoint is certainly a good idea, but I 
suspect the problem is the serial cable. I had exactly the same problem 
in Chicago 10 years ago, and found the cause -- the serial cable was 
parallel wires, not twisted pair. I solved it by building a serial cable 
using CAT5, as shown in the Power Point on Ham Interfacing on my 
website. The better address is k9yc.com/publish.htm

73, Jim K9YC