[RFI] SolarEdge Finds New Source of Solar System RFI

[Jim Brown]

On 6/3/2019 1:58 PM, David Eckhardt wrote:
> Really glad to see these concepts taking traction, even if they are 
> just limited to our small group, here.
>
As an EE working in pro audio, I found that I needed to join the EMC WG 
of the Audio Engineering Society about 20 years ago, in self defense 
from some fools in G-land who didn't understand the needs of audio 
systems to pay attention from near DC to UHF. I learned a LOT from the 
many fine engineers with strong backgrounds in both audio and RF -- from 
companies as diverse as ABC-TV, BBC, multiple microphone companies, 
equipment manufacturers, and designers of everything from recording and 
broadcast studios to sound systems for churches, stadiums, theaters, and 
performing arts centers. My specialty was those sound systems. I also 
learned a lot of very practical EMC practices from Henry Ott in one of 
his 3-day seminars c.a. 2005.

Nearly everything I recently posted I learned in those days, and I've 
been preaching since getting back into ham radio about 15 years ago. 
I've found most RF engineers and practitioners look down on audio 
because of the very low frequencies involved, but pro audio and ham 
radio have at least two VERY important parameter in common: First, the 
extremely wide range of signal levels involved and the need for work 
very close to noise (in audio, it's the very low level outputs of 
microphones picking up quiet sources in quiet spaces), and the very wide 
range of wavelengths that matter.

Audio extends over two decades of frequency, and transducers must 
provide very uniform response over that range over relatively wide 
vertical and horizontal angles. Transducer design, and the use of those 
transducers in practical systems is several orders of magnitude more 
complex than for antenna systems! We're thrilled if a high performance 
antenna covers a few percent frequency range!

A lot of my teaching/preaching can be found at k9yc.com, and some of it 
is in the ARRL Handbook and Antenna Book.

73, Jim K9YC