[Elecraft] [K3] Serial interface noise issues

[Jim Brown]

On 11/1/2011 4:57 PM, Rick Bates wrote:
> Note that on some computers, chassis ground is NOT audio ground and I'd
> suspect the same is true of some radios (true for at least one of my
> Batwings).

It SHOULD be.  If it is not, the mfr goofed. THAT'S what a Pin One 
Problem is!  Further, unless the audio interface is BALANCED, audio 
return will always be referenced to the chassis, but it may be a lousy 
path.

>   Chassis to chassis bonding may increase noise in that case.

WRONG.  This is another of those widely held misconceptions that is 
WRONG. Chassis to chassis bonding is ALWAYS good practice, and ALWAYS 
minimizes buzz and RFI.

73, Jim Brown K9YC