Dr. James Duffey KK6MC has a PhD in Solid State Physics from the University
of Nebraska and his professional life is spent working for SAIC (SAIC, Inc.
is a provider of scientific, engineering, systems integration and technical
services and solutions to all branches of the United States military), in
Albuquerque as a Senior Scientist specializing in infrared detectors,
electronics for space, and high power microwave effects. He much prefers
building VHF/UHF antennas on the kitchen table though.
...
Dr. Duffey was first licensed in 1965 as WN0MWN in Brookings, South Dakota,
now EN14oh. He holds an Extra class license and has also held the calls
WA0MWN and N7ATB. First licensed when novices had two meter phone
privileges, his first VHF activity was with a Heathkit Twoer and a homebrew
3 element beam in 1965; rockbound on 145.2 Mcps. He returned to VHF weak
signal work in the late 90s and began actively roving in 2007. He has
activated all 22 of the grids in NM as a rover and is now pursuing a reverse
VUCC. He holds the Rocky Mountain Division January VHF and August UHF
limited rover records, although, to be honest, he is the only one to have
ever entered in those categories from the Rocky Mountain Division. Jim is an
active QRP op and has been elected to the ARCI QRP Hall of Fame as Dr.
Megacycle.
Marsh, KA5M
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of David
Gilbert
Sent: Friday, January 23, 2015 12:09 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] RF Ground is not a Myth
The misinformation contained in that post is breathtaking. The ARRL should
dedicate a page on their website to that paragraph as a prime example of
careless and unfounded conjecture in our hobby. It goes beyond mere error
... it misleads anyone who has the slightest interest in understanding their
station.
Dave AB7E
On 1/19/2015 7:29 PM, James Duffey wrote:
Even though a perfect ground, RF or otherwise, does not exist in practice,
the RF ground is not a myth. At least not a myth in the same sense that
Thor, Zeus, just taxes, and Chupacabra are a myth. The RF ground is a useful
theoretical construct. This theoretical construct is a result of solid
thinking. Given that it is hard to realize in practice, but it does have its
use in understanding current flow in RF circuits, the practical problems in
implementing a useful ground, and why we have problems in circuits that we
don't think should have problems. Simply put, an RF ground is an infinite
source or sink of carriers, delivered or received with minimal delay. That
of course is not realizable, but understanding why the carriers cannot be
delivered or absorbed with minimal delay helps a great deal in understanding
the practical implementation of circuits we design.
In more general terms, theory is not myth, even if it cannot be
realized in practice. - Duffey KK6MC
On Jan 19, 2015, at 3:37 PM, K9YC through towertalk-request@contesting.com
wrote:
"The real issue is that the concept of "RF Ground" is a myth and the
result of fuzzy thinking."
--
KK6MC
James Duffey
Cedar Crest NM
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