[Elecraft] k3 switching supply

[John Freed]

Hi!!  I have a K3 ser# 07023.  I use a MFJ-4125P switching power supply to 
operate my rig.  Using it with my K3 for over a year.  No problems.  The 
Elecraft K3 switching power supply should work as well if not better than 
the MFJ where noise (rf and otherwise) is concerned.  The ARRL has several 
reviews of switching power supplies in their on line archives.
Hope this helps and / or adds to the conversation.

>> John, KX6F  <<

-----Original Message----- 
From: Milverton M. Swire via Elecraft
Sent: Thursday, June 18, 2015 2:14 PM
To: jim at audiosystemsgroup.com ; elecraft at mailman.qth.net
Subject: Re: [Elecraft] k3 switching supply

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"
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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