[Elecraft] [K3] Noise from P3

[Jim Brown]

On 3/23/2011 9:39 PM, David Pratt wrote:
> That being so, Alan, is there any value in supplying screened cable for
> the power lead rather than the twin 'bell wire' used at present?

Not if it is common mode current, coupled from signal common onto the V- 
wire. Go to my website and study the material on "The Pin One Problem."  
While it is written about audio interconnects, it applies directly here 
to the V- lead.

http://audiosystemsgroup.com/publish.htm

Shielding only matters with respect to DIFFERENTIAL circuit (that is, 
RFI between V+ and V-).

73, Jim K9YC