Thanks. I knew Allen Burdick, who died quite a few years ago. Bill
Whitlock and I still serve on the AES Standards Committee, and are
principal authors of AES Standards on EMC, and I've been Vice-Chair of
the EMC Working Group for about 15 years. The first draft of four of
those Standards started out with Neil Muncy and me around my kitchen
table. Bill and I have taught EMC workshops together. Bill is far more
than Deane's protege -- a fine engineer in own right. Deane was a fine
engineer, and published some important work before he died. Bill, Neil
Muncy, and I were elected Fellows of the AES, partly on the basis of our
EMC work.
I retired about ten years ago from a career that started in broadcasting
and ended in pro audio. When Neil Muncy died, I was asked to take over
the EMC workshops that he had taught for many years at conventions for
sound contractors, and continued that until about four years ago. Slides
and a White Paper are on the pro audio section of that publications page.
73, Jim K9YC
On 8/8/2019 9:31 AM, Michael Arnold wrote:
Jim,
Excellent and comprehensive info on your website! Everyone should take
a look at it.
In my setup, the power supplies for the KX3, Raspberry Pi and powered
speakers are the typical 2-wire, no ground, switching supply in a
plastic case, so ground potential is established through the audio
interconnect. The rig and computer connect only through the USB ports
for the USB serial adapter and the USB audio interface. After a little
experimentation, I realized The “hum” I was hearing was RF getting
into the powered speakers on transmit with the antenna I close
proximity to the KX3. Moving the antenna away from the rig resolved
the issue.
This is a little off-topic, but may be of interest to the audio geeks
on the list...
I worked in TV engineering here in Nashville for many years, and we
dealt with a lot of music recorded in big studios, and thus long cable
runs and a lot of channels of audio. It was all analog in the early
days and several audio engineering luminaries helped me immensely. One
was Allen Burdick of Benchmark Media Systems. His “Clean Audio
Installation Guide” is still indispensable:
https://cdn.shopify.com/s/files/1/0321/7609/files/caig.pdf
Deane Jensen of Jensen Transformers fame and his protégé, Bill
Whitlock, were two others:
https://www.jhbrandt.net/wp-content/uploads/2014/11/Design_of_High-Performance_Balanced_Audio_Interfaces.pdf
And a local genius, Dave Harrison, who designed an built the legendary
Harrison Consoles that we used extensively:
https://harrisonconsoles.com/site/history.html
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