[Elecraft] KX3 and JS8CALL

[Jim Brown]

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