[Elecraft] k3 switching supply

[Jim Brown]

On Thu,6/18/2015 12:14 PM, tnnyswy at yahoo.com wrote:
> Jim, are you not contradicting yourself?
>
> >>> " and there
> ain't no such thing as a "ground loop." <<<
>
> >> What there IS is a difference in
> potential between the chassis of one device and the other. <<
>
> Isn't your stated wording almost the exact wording used by many, 
> including Wikipedia as a " Ground Loop"

The words "ground loop" are misleading, because they do not describe 
what is going on, which in turn causes people to do dumb things to solve 
the problem.

I've not read the Wikipedia entry. Rather, I'm using EE circuit analysis 
101.

73, Jim K9YC
>
> I'm a bit confused.
>
> ((((73)))) Milverton / W9MMS.
>
>
> ------------------------------------------------------------------------
> *From:* Jim Brown <jim at audiosystemsgroup.com>
> *To:* elecraft at mailman.qth.net
> *Sent:* Thursday, June 18, 2015 1:38 PM
> *Subject:* Re: [Elecraft] k3 switching supply
>
> On Wed,6/17/2015 4:55 AM, Marc Veeneman wrote:
> > When I connected station ground to the power supply that went away, 
> I think it was a ground loop.
>
> Wrong word, correct solution.  The correct word is "bonding," and there
> ain't no such thing as a "ground loop." What there IS is a difference in
> potential between the chassis of one device and the other. When you bond
> chassis to chassis, you reduce that difference to a small value.
>
> >  With these changes I now have no RFI from either one.
>
> Proper station bonding is quite important, both for safety and to
> minimize noise. But a connection to EARTH, while important for lightning
> protection, is not part of a solution for hum, buzz, or RFI.
>
> http://k9yc.com/GroundingAndAudio.pdf
>
> 73, Jim K9YC
>
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