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Re: [RFI] Bulk order source for Ferrite beads?

To: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Subject: Re: [RFI] Bulk order source for Ferrite beads?
From: Charles Gallo <charlie@thegallos.com>
Date: Wed, 20 Feb 2019 05:32:16 -0500
List-post: <mailto:rfi@contesting.com>
Just remember, there ARE schools full of kids who DO study math, and 
engineering. My daughter is one of them (she is on Co-op doing radar systems), 
and my son will be doing computer engineering starting next year. He’ll be 
going to the same school as his sister(RIT)

--  
73 de KG2V
Charlie

> On Feb 20, 2019, at 1:17 AM, Roger (K8RI) <k8ri@rogerhalstead.com> wrote:
> 
> No natter how long we're in here there's always something new to learn.  
> Thanks for all the work Jim.
> 
> Too bad so many of the newer generations of hams have so little interest in 
> the technical aspects, but I think that is true for all STEM subjects.
> Wayyyy back and the occupy Wall Street, I remember a girl being interviewed 
> who was complaining about all the good paying jobs going to those majoring in 
> STEM subjects (paraphrased). The interviewer then asked if she knew that, 
> then why not major in one of those subjects.  The answer? Oh, those are too 
> hard! They expect to find any info they need using Google.  If that doesn't 
> work then it's too hard.
> 
> Each generation has had a label. I guess I'd call the present one, the "Look 
> Up Generation", or the Google Generation"
> 
> Difficult, maybe, as a student needs to take (and pass) all the needed 
> classes ahead of time. The math we use as hams is greatly simplified compared 
> to engineering.  We normally deal with only static points, or look up points 
> on a graph, while engineering deals with dynamic data using Calculus as does 
> Computer Science.  As hams we can normally "get by" using, at most, basic 
> Trig and Algebra. There are now many pages out there where we can just "Plug 
> in the numbers" to get answers for many complex problems.  The most difficult 
> part being, finding those pages.
> 
> 73, Roger (K8RI)
> 
> 
> 
>> On 2/3/2019 1:54 PM, Jim Brown wrote:
>>> On 2/3/2019 7:06 AM, Larry Benko wrote:
>>> Not very scientific but common mode circuits are elusive to understand and 
>>> simulate.
>> 
>> Not true. I've done a lot of research on common mode chokes and published 
>> the results, first in 2005, then in 2008, updated in 2010 and 2016, and most 
>> recently in 2018. Once you understand the equivalent circuit of a ferrite 
>> choke, you can analyze it in the common mode circuit.
>> 
>> k9yc.com/RFI-Ham.pdf
>> k9yc.com/2018Cookbook.pdf
>> 
>> Beginning on page 41 of RFI-Ham, I related my interface with engineers from 
>> CIA, the leader of which subsequently forwarded me an unclassified 1966 DOD 
>> study that came to all of the same conclusions I did.
>> 
>> 73, Jim K9YC
>> 
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>> 
> 
> -- 
> Roger (K8RI)
> 
> 
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