[Elecraft] K3 Microphone Cable

[Jim Brown]

On 5/4/2011 10:27 PM, Joe Subich, W4TV wrote:
> It will work fine.  Just be sure to use one pair for mic and mic return
> (pin1 and pin 7) and one pair for PTT and ground (pin 2 and pin 8).
> The other pins can be any wires but using twisted pairs for mic/mic
> return and PTT/Ground will provide the best balancing to reduce any
> hum/RFI issues with the unshielded cable.

EXACTLY RIGHT.  Twisted pair, in general, provides very good rejection 
of hum, buzz, and RFI, and CAT5/6 is VERY VERY GOOD twisted pair.  
Shielding doesn't hurt, but it doesn't help either. Twisting is enough. 
The important thing is to follow Joe's advice on wiring.

73, Jim K9YC