<div style="color:black;font: 10pt arial;">Corey and Steve (and others who might be interested), here is a link to one of my presentations in pdf format:
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<div><a href="https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf">https://centralindianaaes.files.wordpress.com/2012/09/indy-aes-2012-seminar-w-notes-v1-0.pdf</a></div>
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<div>Cory, note the section on AC power and the example of just what you proposed.</div>
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<div>Steve, note the explanation of how a balanced interface rejects noise - it has nothing whatsoever to do with equal and opposite signal swings.</div>
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<div>Bill Whitlock</div>
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<div>Whitlock Consulting</div>
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<div>Ventura, CA</div>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Corey Bailey Audio Engineering <proaudio@baileyzone.net><br>
To: proaudio <proaudio@bach.pgm.com><br>
Sent: Mon, Nov 4, 2019 4:10 pm<br>
Subject: Re: [ProAudio] AES on the west coast, was Re: Ampex/ProAudio List Dinner<br>
<br>
<div id="yiv0550525760">
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<div><font face="Arial">Jim Brown, Bill Whitlock & David
Josephson:</font></div>
<div><font face="Arial">All great advice,</font></div>
<div><font face="Arial">For equipment that I want to be truly ground
isolated, I use a driven stake (Grounding Rod) and avoid AC
ground if at all possible (local electrical codes be damned!).
Then, follow the advice of someone who's knowledgeable on the
subject of proper grounding. (Like, any of the three mentioned
above.)</font></div>
<div><font face="Arial">Cheers!</font></div>
<div><font face="Arial">Corey</font><br clear="none">
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<pre class="yiv0550525760moz-signature">Corey Bailey Audio Engineering
<a rel="noopener noreferrer" shape="rect" class="yiv0550525760moz-txt-link-abbreviated" target="_blank" removedlink__fb6d439d-a349-471b-a25c-08108ac7f115__href="http://www.baileyzone.net">www.baileyzone.net</a></pre>
<div class="yiv0550525760yqt9553489924" id="yiv0550525760yqtfd96889">
<div class="yiv0550525760moz-cite-prefix">On 11/4/2019 10:18 AM, Jim Brown wrote:<br clear="none">
</div>
<blockquote type="cite">On
11/3/2019 7:38 PM, David Josephson wrote:
<br clear="none">
<blockquote type="cite">For instance as Jim Brown says, every
conductor is an antenna.
<br clear="none">
</blockquote>
<br clear="none">
My favorite quote on this topic is from Henry Ott, who in his
lectures spoke of the hidden schematic lurking behind the ground
symbol. Since my retirement, I've been devoting my energies to ham
radio, teaching fundamentals to folks with a wide variety of
technical backgrounds. No surprise, the Pin One Problem is a hot
topic -- Neil Muncy repeatedly told me that it was the primary
mechanism behind RFI, and work for a paper that David and I
co-authored in 2003 proved it. Fast forward to today, Pin One in
CATV and DSL systems is the cause of EGRESS of RF noise that
pollutes the radio spectrum.
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I do, however, strongly object to the phrase "ground loop,"
instead using Bill's excellent model showing the mechanism as a
difference in potential chassis-to-chassis between interconnected
equipment (or chassis to ground) t as the cause of shield current,
whether that difference is created by IR drops in green wires or
antenna action. The reason I so strongly object is the that
solution, especially in small very local systems, is so often
proper bonding, which visually creates a loop with signal
conductor shields. I'm thinking here of a home entertainment
system or a ham station. I use a drawing of Bill's model in my
talks and on-sine tutorials.
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I stopped teaching at trade shows several years ago because I was
unwilling to participate in one held in Florida, in protest of the
acquittal of that vigilante murder and the law that allowed it.
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As to our conventions -- my interest has always been in the papers
and workshops, and hanging out with colleagues. In retirement, I
can no longer justify the cost of a convention that requires a
hotel stay in an expensive city.
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Henry Ott also did a great breakdown on the inductance of a wire
as part of a loop.
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Jim Brown
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