Working in EMC was (and can be still) ) a lot of fun; many if not most
of my colleagues and co-workers didn't understand my logic. Ed, when
they closed down Tandy's EMC lab, I was the last one there, and when
AST bought out Radio Shacks computer business, they left things behind
in RS's surplus/maybe working store, which is how I happened to find
the LISN ARRL bought from me sometime later.
Fun? I'd been blamed for turning off bare motherboards in a software
testing lab -- and they were in such a hurry they 1) counldn't get
assembled computers, 2) orafford ESD chairs and tiles, plus 3) needed
that fixed RIGHT NOW. I had them spritz the office chairs they were
using with water adn dish detergent -- and for quite some tme,they all
had wet seats and trousers.
Tandy made a non-computer (to avoid TI's 14% IC royalties) and they
blamed the EMC lab when the Board of Directors was celebrating the new
product . The TV they were using had strange colors washing across the
screen -- and I had a hunch, one confirmed with an unplugged
hotplate. It was like that everywhere I was hired; NOT magic -- just HS
physics.
It was like that in the Army, too:
https://www.quora.com/Do-you-pretend-that-youre-smart/answer/Cortland-Richmond
<https://www.quora.com/Do-you-pretend-that-youre-smart/answer/Cortland-Richmond>
Cortland KA5S
On 9/28/2020 3:16 PM, Hare, Ed W1RFI wrote:
I agree, but I like magic, so that's my story. Yes, one can actually do real
science and come up with answers, but that often involved multiple interrelated
phenomena that are best sorted out with expensive modeling.
When a ham has an interference problem involving a neighbor, there is rarely the patience
to try different things, so I usally recommend that the ham do a shotgun approach
involving all possible common-mode and differential-mode filters, install them and then
get the heck out of there as quickly as possible. Usually, by about the third failed
attempt to find "the" correct cure, the neighbor concludes that the ham doesn't
know what he/she is doing and concludes that the problem in in the ham station and ends
the project.
-----Original Message-----
From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> On Behalf Of K9MA
Sent: Monday, September 28, 2020 2:52 PM
To: rfi@contesting.com
Subject: Re: [RFI] Question Regarding Variations In Solar Panel RFI?
On 9/28/2020 12:39 PM, Hare, Ed W1RFI wrote:
And even what is not connected to the system, but nearby. Any radiation from the
system can be capacitively coupled or induced in nearby wiring and re-radiated.
Grounds can be resonant or not resonant.EMC is still magic. 😊
I wouldn't say magic, just complicated.
73,
Scott K9MA
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