[Elecraft] K3 in NAQP SSB

[Joe Subich, W4TV]

Tom writes: 

> It's just silly to design an audio interface device that 
> commons the shield of audio lines to multiple pieces of gear 
> or to the cabinet, but that is how Ham accessories are 
> usually made.

The transceiver manufacturers generally force that design by 
using unbalanced audio input/output and tying the cold side 
to the chassis.  The solution would be to use balanced and 
shielded inputs and outputs.  In addition to eliminating the 
"sneak" path for power supply currents, balanced inputs 
would provide significant additional immunity against common 
mode noise and RF.