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: [email protected] ; [email protected]
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 <[email protected]>
To: [email protected]
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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